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U.S. Department of the InteriorU.S. Geological Survey
Scientific Investigations Report 2010–5033
Prepared in cooperation with the West Virginia Department of Transportation, Division of Highways
Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
By Jeffrey B. Wiley and John T. Atkins, Jr.
Prepared in cooperation with the West Virginia Department of Transportation, Division of Highways
Scientific Investigations Report 2010–5033
U.S. Department of the InteriorU.S. Geological Survey
U.S. Department of the InteriorKEN SALAZAR, Secretary
U.S. Geological SurveyMarcia K. McNutt, Director
U.S. Geological Survey, Reston, Virginia: 2010
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Suggested citation:Wiley, J.B., and Atkins, J.T., Jr., 2010, Estimation of flood-frequency discharges for rural, unregulated streams in West Virginia: U.S. Geological Survey Scientific Investigations Report 2010–5033, 78 p.
ISBN 978-1-4113-2769-6
iii
Contents
Abstract ...........................................................................................................................................................1Introduction.....................................................................................................................................................1
Regional Historical Floods ...................................................................................................................1Description of Study Area ...................................................................................................................4Previous Studies ...................................................................................................................................4This Study ...............................................................................................................................................6
Development of Flood-Frequency Discharge Equations .........................................................................7Peak Discharges ...................................................................................................................................7Basin Characteristics ...........................................................................................................................7Correlation of Basin Characteristics .................................................................................................9West Virginia Skew Coefficients ........................................................................................................9Flood-Frequency Discharges ............................................................................................................10Regional Regression of Flood-Frequency Discharges .................................................................11Accuracy of Flood-Frequency Discharge Equations ....................................................................14
Procedures For Estimating Flood-Frequency Discharges ....................................................................15At a Streamgage Station ...................................................................................................................15At an Ungaged Location ....................................................................................................................15
Upstream From a Streamgage Station ...................................................................................18Downstream From a Streamgage Station .............................................................................18Between Streamgage Stations ...............................................................................................18
Hydrologic Conditions Change Linearly between Streamgage Stations ................19Hydrologic Conditions Change Linearly to the Regional Hydrologic Conditions
between Streamgage Stations .........................................................................19Not on the Same Stream as a Streamgage Station .............................................................20
Example Applications .........................................................................................................................20Limitations of Procedures for Estimating Flood-Frequency Discharges ...................................21
Summary........................................................................................................................................................21References Cited..........................................................................................................................................22Appendix 1. Matrices Used to Compute Individual Standard Errors of Prediction ..........................78
iv
Figures 1–4. Map showing— 1. Selected streams used for identifying regional extent of historic floods
in West Virginia ....................................................................................................................2 2. Appalachian Plateaus, Valley and Ridge, and Blue Ridge Physiographic
Provinces, and Climatic Divide in West Virginia .............................................................5 3. The 290 U.S. Geological Survey streamgage stations in West Virginia and
adjacent states considered in the estimation of flood-frequency discharges in West Virginia. ...................................................................................................................8
4. The Eastern Panhandle, Central Mountains, and Western Plateaus Regions of West Virginia for which equations for estimation of flood frequency discharges were developed in this study ......................................................................12
5–7. Graph showing— 5. Range of differences of the individual standard errors of the prediction from
the average prediction errors for the indicated drainage areas ...............................14 6. LOESS curves of the absolute difference between the 100-year flood
discharges determined at streamgage stations and values estimated from the (1) drainage-area ratio method and (2) regional equations, in relation to the ratios of the drainage areas ......................................................................................17
7. LOESS curves of the absolute difference between the 1.1- through 500-year flood discharges determined at streamgage stations and values estimated from the (1) drainage-area ratio method and (2) regional equations, in relation to the ratios of the drainage areas .................................................................................17
Tables 1. Identification numbers, station numbers, streamgage-station names, and skew
coefficients and statistics for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states ................................25
2. Flood-frequency statistics and drainage areas for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states ............................................................................................................................................36
3. Flood-frequency discharges for the 290 U.S. Geological Survey streamgage stations on rural, unregulated streams in West Virginia and adjacent states .................46
4. Equations used to estimate selected flood-frequency discharges for streams in the Eastern Panhandle, Central Mountains, and Western Plateaus Regions of West Virginia ...........................................................................................................................13
5. Description of the 88 pairs of U.S. Geological Survey streamgage stations in West Virginia and adjacent states that were evaluated to quantify “near” for application of the drainage-area ratio method in this study ...............................................73
6. Values of the exponent, and upstream and downstream limits of the drainage- area ratios used to quantify the definition of “near” for estimating selected flood-frequency discharges for ungaged locations in West Virginia ................................16
v
Conversion Factors, Datums, Acronyms, and Abbreviations
Multiply By To obtainLength
inch (in.) 2.54 centimeter (cm)foot (ft) 0.3048 meter (m)mile (mi) 1.609 kilometer (km)
Areasquare mile (mi2) 2.590 square kilometer (km2)
Flow ratecubic foot per second (ft3/s) 0.02832 cubic meter per second (m3/s)cubic foot per second per square
mile [(ft3/s)/mi2] 0.01093 cubic meter per second per square
kilometer [(m3/s)/km2]
Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88).
Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).
Altitude, as used in this report, refers to distance above the vertical datum.
AcronymsGLSNet USGS software for computing generalized least-square regressionLOESS Locally weighted regressionPeakFQ USGS software for computing flood-frequency discharges S-PLUS Commercially available software for computing statistics USGS U. S. Geological SurveySWSTAT USGS software for computing surface-water statistics
AbbreviationsAOP Annual-occurrence probability AU Drainage area at the location of the unknown flood-frequency dischargeAK Drainage area at the location of the known flood-frequency dischargeAUS Drainage area at the upstream locationADS Drainage area at the downstream locationAOP Annual-occurrence probabilityDRNAREA Drainage area EX Exponent for drainage-area ratios
vi
EY Equivalent years of recordK Frequency factor MSE Mean-square error N Number of years of peak-discharge record Q DischargeQDS Flood-frequency discharge at the downstream location QK Known flood-frequency dischargeQKE Regional equation evaluated at the location of the known flood-frequency dischargeQr Flood-frequency discharge determined from the appropriate regional equationQs Flood-frequency discharge determined from systematic and historical recordQU Unknown flood-frequency dischargeQUE Regional equation evaluated at the location of the unknown flood-frequency dischargeQUS Flood-frequency discharge at the upstream location Qw Discharge weighted by number of years of peak-discharge record at the gaging station and equivalent years of record for the appropriate regional equationQ(n) Discharge for the n-year recurrence intervalRDS Downstream limit of the ratio of drainage areas RU/K Ratio of the drainage area at the location of the unknown flood-frequency discharge to the drainage area at the location of the known flood-frequency discharge RUS Upstream limit of the ratio of drainage areasSP Standard deviation of the log10-transformed annual peak dischargesX Log10-transformed annual peak dischargesXmean Mean of the log10-transformed annual peak discharges
Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
By Jeffrey B. Wiley And John T. Atkins, Jr.
IntroductionMany engineering projects are built within or adjacent to
flood-prone areas. Information on past flooding and estimates of the magnitude and frequency of potential future floods are critical to the safe and economical design of hydraulic struc-tures such as bridges, culverts, dams, flood dikes, and levees.
Regional Historical Floods
Before 1930, neither floods nor streamflow in West Virginia were systematically documented. Since 1930, data on regional flooding has been collected as part of the operation of a statewide streamgaging network supported by State and Federal funding. Local floods in small, ungaged watersheds remain only sparsely quantified. Major regional floods affect-ing parts of West Virginia occurred in 1844, 1877, 1878, 1888, 1889, 1912, 1918, 1932, 1936, 1949, 1963, 1967, 1977, 1984, 1985, and 1996. For floods prior to 1930, the regional extent is not defined, but rivers other than those identified in West Virginia may have been affected. Locations of selected West Virginia streams are shown in figure 1. A list of flood dates with a brief description of the flood and the report that docu-ments the flood follows.
• July 1844: Flooding on the Cheat River was docu-mented by Speer and Gamble (1965, p. 148). This flood was about equal in magnitude to those in July 1888 and May 1996.
• November 1877: Flooding on the South Branch Potomac River was documented by Tice (1968, p. 488, 490). This flood was about equal in magnitude to those in March 1936 and September 1996.
• September 1878: Flooding on the New River was documented by Speer and Gamble (1965, p. 284–288).
AbstractFlood-frequency discharges were determined for 290
streamgage stations having a minimum of 9 years of record in West Virginia and surrounding states through the 2006 or 2007 water year. No trend was determined in the annual peaks used to calculate the flood-frequency discharges.
Multiple and simple least-squares regression equations for the 100-year (1-percent annual-occurrence probability) flood discharge with independent variables that describe the basin characteristics were developed for 290 streamgage stations in West Virginia and adjacent states. The regression residuals for the models were evaluated and used to define three regions of the State, designated as Eastern Panhandle, Central Mountains, and Western Plateaus. Exploratory data analysis procedures identified 44 streamgage stations that were excluded from the development of regression equations representative of rural, unregulated streams in West Virginia. Regional equations for the 1.1-, 1.5-, 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year flood discharges were determined by generalized least-squares regression using data from the remaining 246 streamgage stations. Drainage area was the only significant independent variable determined for all equa-tions in all regions.
Procedures developed to estimate flood-frequency dis-charges on ungaged streams were based on (1) regional equa-tions and (2) drainage-area ratios between gaged and ungaged locations on the same stream. The procedures are applicable only to rural, unregulated streams within the boundaries of West Virginia that have drainage areas within the limits of the stations used to develop the regional equations (from 0.21 to 1,461 square miles in the Eastern Panhandle, from 0.10 to 1,619 square miles in the Central Mountains, and from 0.13 to 1,516 square miles in the Western Plateaus). The accuracy of the equations is quantified by measuring the average predic-tion error (from 21.7 to 56.3 percent) and equivalent years of record (from 2.0 to 70.9 years).
2 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
OHIO
PENNSYLVANIA
MARYLAND
VIRGINIA
KENTUCKY
Rive
r
Potomac River
South
Bra
nch
North B
ranchRi
ver
Oh io River
New River
Greenb
rier R
iver
Gu y andotte R
i ver
Tug Fo r k R i v e r
Ka n awha R iver
Elk Ri v
er
Little K ana w h a River
Cheat River
Tygart Valley River
Monon
gahe
la
G auley R ive
r
Big
Sand
y78°W81°W
40°N
38°N
0 20 40 60 MILES
0 20 40 60 KILOMETERS
EXPLANATIONState boundary
Major stream
Base from U.S. Geological Survey 1:100,000 digital line graphics. Universal Transverse Mercator projection, zone 17, NAD 83.
Figure 1. Selected streams used for identifying regional extent of historic floods in West Virginia.
Introduction 3
• July 1888: Flooding on the Monongahela River was documented by Speer and Gamble (1965, p. 121, 138, 146–149). This flood was about equal in magnitude to those in July 1844 on the Cheat River and May 1996 on the Cheat and upper Monongahela Rivers.
• May–June 1889: Flooding on the North Branch Potomac River was documented by Tice (1968, p. 480, 490, 494, 497). This flood was about equal in magni-tude to those in March 1936 and September 1996.
• July 1912: Flooding on the Tygart Valley River was documented by Speer and Gamble (1965, p. 118, 121, 127–128).
• March 1918: Flooding on the Greenbrier and Gauley Rivers was documented by Speer and Gamble (1965, p. 298, 310).
• February 1932: Flooding on the Tygart Valley, Green-brier, and Gauley Rivers was documented by Speer and Gamble (1965, p. 119, 121, 129, 295, 298, 304, 307, 310).
• March 1936: Flooding was documented on the Potomac and Cheat Rivers. This flood, which was documented by Grover (1937) as having a regional extent including the upper Ohio, Potomac, and James Rivers (the James River in Virginia), was caused by four separate cyclonic storms passing over the northeastern United States, resulting in multiple peak discharges and superposition of later peak discharges on earlier peak discharges. This flood was about equal in magnitude to those in November 1877 on the South Branch Potomac River, May through June 1889 on the North Branch Potomac River, and September 1996 on the upper Potomac River (both North and South Branch).
• June 1949: Flooding on the South Branch Potomac River was documented by Tice (1968, p. 483–488).
• March 1963: Flooding was documented on the Big Sandy (including the Tug Fork in West Virginia), Guy-andotte, Little Kanawha, Cheat, and Greenbrier Rivers. This flood, which was documented by Barnes (1964) as having affected the western slopes of the Appala-chian Mountains from Alabama to West Virginia, was caused by three separate frontal storms in which rain fell on a snowpack and was followed by two additional storms.
• March 1967: Flooding was documented on the Kanawha and Monongahela Rivers. This flood was caused by 4 to 5 in. of rainfall over 3 days, augmented by runoff from melting snow (U.S. Geological Survey, 1991).
• April 1977: Flooding was documented on the Tug Fork and Guyandotte Rivers. This flood was documented by Runner (1979) and Runner and Chin (1980) as having affected northeastern Tennessee, southwestern Vir-ginia, eastern Kentucky, and southern West Virginia. This flood resulted from a frontal storm that moved southeastward through the region, became stationary, then moved slowly northwestward drawing a warm moist maritime airmass from the Gulf of Mexico and combining to produce heavy rainfall. The highest peak discharges ever recorded on the Tug Fork and Guyan-dotte Rivers resulted from this storm.
• May 1984: Flooding was documented on the Tug Fork and Guyandotte Rivers (U.S. Geological Survey, 1991).
• November 1985: Flooding was documented on the Monongahela, Potomac, upper Little Kanawha, upper Elk, and upper Greenbrier Rivers. This flood was documented by Lescinsky (1987) and Carpenter (1990) as having affected eastern West Virginia, western and northern Virginia, southwestern Pennsylvania, and western Maryland. This flood resulted from a complex sequence of meteorological events. Hurricane Juan moved from the Gulf of Mexico through southern Mississippi, ultimately causing precipitation as far north as Michigan and generating less than 2 in. of rainfall in West Virginia. This rainfall was caused by a second low pressure system that developed from the hurricane remnants. The low pressure developed near the Tennessee-North Carolina border and trav-eled rapidly eastward to the Atlantic Ocean. A third low pressure system moved from the Gulf of Mexico into the Florida panhandle then moved slowly up the east coast of the United States, resulting in additional rainfall in West Virginia of up to 9 in. The highest peak discharges ever recorded on the upper Monongahela and Potomac Rivers resulted from this flood.
• January 1996: About 2 in. of rain fell on a 3 to 4 ft snowpack, resulting in flooding in the upper Potomac, upper Cheat, upper Elk, and Greenbrier Rivers.
• May 1996: A frontal storm caused flooding on the Cheat and upper Monongahela Rivers that was about equal in magnitude to flooding on the Cheat River in July 1844 and July 1888.
• September 1996: Tropical storm Fran caused regional flooding on the upper Potomac River. This flood was about equal in magnitude to that in November 1877 on the South Branch Potomac River, to that in May through June 1889 on the North Branch Potomac River, and to that in March 1936 on the upper Potomac River.
4 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
Description of Study Area
West Virginia can be differentiated into three phys-iographic provinces, the Appalachian Plateaus, Valley and Ridge, and Blue Ridge (Fenneman, 1938) (fig. 2). The move-ment of air masses across the State allows identification of two climatic regions, separated by a line defined as the Climatic Divide (Wiley, 2008) (fig. 1).
Generally, the part of the State west of the Climatic Divide is in the Appalachian Plateaus Physiographic Province, where altitudes range from about 2,500 to 4,861 ft (NAVD88) at Spruce Knob along the Climatic Divide to about 550 to 650 ft along the Ohio River. The part of West Virginia east of the Climatic Divide is in the Valley and Ridge Physiographic Province, except for the extreme eastern tip of the State, which is in the Blue Ridge Physiographic Province. Altitudes decrease eastward from the Climatic Divide to 274 ft at Harp-ers Ferry in the Eastern Panhandle (U.S. Geological Survey, 1990, 2006; National Oceanic and Atmospheric Administra-tion, 2006a).
The Appalachian Plateaus Physiographic Province con-sists of consolidated, mostly noncarbonate sedimentary rocks that have a gentle slope from southeast to northwest near the Climatic Divide and are nearly flat-lying along the Ohio River. One exception is in the northeastern area of the province (west of the Climatic Divide), where the rocks are gently folded and some carbonate rock crops out (Fenneman, 1938). The rocks in the Appalachian Plateaus Physiographic Province have been eroded to form steep hills and deeply incised valleys; drainage patterns are dendritic.
The Valley and Ridge Physiographic Province in West Virginia consists of consolidated carbonate and noncarbon-ate sedimentary rocks that are folded sharply and extensively faulted (Fenneman, 1938). Northeast-trending valleys and ridges parallel the Climatic Divide; drainage patterns are trellis.
The Blue Ridge Physiographic Province within West Vir-ginia consists predominantly of metamorphosed sandstone and shale (Fenneman, 1938). The province has high relief between mountains and wide valleys that parallel the Climatic Divide.
The climate of West Virginia is primarily continental, with mild summers and cold winters. Major weather systems generally approach from the west and southwest, although polar continental air masses of cold, dry air that approach from the north and northwest are not unusual. Air masses from the Atlantic Ocean sometimes affect the area east of the Climatic Divide and less frequently affect the area west of the Climatic Divide. Generally, tropical continental masses of hot, dry air from the southwest affect the climate west of the Climatic Divide. Tropical maritime masses of warm, moist air from the Gulf of Mexico affect the climate east of the Climatic Divide more than west of the Climatic Divide. Evaporation from local and upwind land surfaces, lakes, and reservoirs also provides a source of moisture that affects the climate of the State (U.S. Geological Survey, 1991; National Oceanic and Atmospheric Administration, 2006a).
Annual precipitation averages about 42 to 45 in. state-wide with about 60 percent received from March through August. July is the wettest month, and September through November are the driest. Annual average precipitation in the State generally decreases northwestward from about 50 to 60 in. along the Climatic Divide to about 40 in. along the Ohio River, and increases from about 30 to 35 in. east of the Climatic Divide to about 40 in. in the extreme eastern tip of the State. Greater precipitation along and west of the Cli-matic Divide is a consequence of the higher elevations along the Divide and the general movement of weather systems approaching from the west and southwest. Annual average snowfall follows the general pattern of annual average pre-cipitation, decreasing northwestward from about 36 to 100 in. along the Climatic Divide to about 20 to 30 in. along the Ohio River. Annual average snowfall ranges from 24 to 36 in. east of the Climatic Divide (U.S. Geological Survey, 1991; Natural Resources Conservation Service, 2006; National Oceanic and Atmospheric Administration, 2006a, 2006b).
Flooding across large drainage areas results from regional climatic events like frontal systems in winter and early spring, rainfall on snowpack in early spring, and tropical cyclones (hurricanes and tropical storms) in late summer or early fall. Generally, the most severe flooding across small drainage areas results from local intense thunderstorms in late spring through summer (Doll and others, 1963).
Previous Studies
Flood-frequency studies completed by Wiley and oth-ers (2000, 2002) used data for peak discharges from 267 rural, unregulated streamgage stations in West Virginia and adjacent states. Simple and multiple least-squares regression models were used to determine three regions in the State and to develop initial estimating equations with drainage area as the only significant independent variable. The final estimat-ing equations were determined for the 1.1-, 1.2-, 1.3-, 1.4-, 1.5-, 1.6-, 1.7-, 1.8-, 1.9-, 2-, 2.5-, 3-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year flood discharges using a generalized least-squares regression model (Stedinger and Tasker, 1985; Tasker and Stedinger, 1989).
New procedures for transferring the flood-frequency discharges determined by Wiley and others (2000, 2002) to ungaged locations were presented by Wiley (2008, Appendix 1). These methods incorporated a comparison of discharge estimates determined using drainage-area ratios to discharge estimates determined by application of the flood-fre-quency equations. This current study repeats that analysis and supersedes the results presented in Wiley (2008, Appendix 1).
Atkins and others (2009) determined generalized skew coefficients applicable to West Virginia (WV skew) for use in determining flood-frequency discharges at streamgage sta-tions. The WV skew coefficients supersede the United States skew coefficients (U.S. skew) determined by the Interagency Advisory Committee on Water Data (1982). Analysis of
Introduction 5
VALLEY A
ND RID
GE
A P P A L A C H I A N PL AT E A U S
BLUERIDGE
Elkins
Beckley
SpruceKnob
Wheeling
Morgantown
HuntingtonCharleston
Harpers Ferry
OHIO
PENNSYLVANIA
MARYLAND
VIRGINIA
KENTUCKY
78°W81°W
40°N
38°N
0 20 40 60 MILES
0 20 40 60 KILOMETERS
EXPLANATIONState boundary
Geographic location
Cl i m
a t i c Di v i d e
Base from U.S. Geological Survey 1:100,000 digital line graphics. Universal Transverse Mercator projection, zone 17, NAD 83.
Physiographic provinces from Fenneman, 1938
Figure 2. Appalachian Plateaus, Valley and Ridge, and Blue Ridge Physiographic Provinces, and Climatic Divide in West Virginia.
6 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
discharges at 147 rural, unregulated streams in West Virginia and adjacent states with streamgage stations followed guide-lines established by the Interagency Advisory Committee on Water Data (1982), except that streamgage stations having 50 or more years of record were used instead of those with the recommended 25 years of record. The increased record length of 50 years was determined to be statistically significant when compared to the recommended 25 years. The generalized-skew analysis considered contouring, averaging, and regres-sion of station skews; the best method was determined to be that with the smallest mean-square error (MSE). The con-touring of station skews was found to be the best method for determining generalized skew for West Virginia, with a MSE of 0.2174 (Atkins and others, 2009). The MSE of 0.2174 is a significant improvement (28 percent reduction) over the MSE of 0.3025 for the U.S. skew, presented by the Interagency Advisory Committee on Water Data (1982).
Flood-frequency studies completed by Frye and Run-ner (1969, 1970, 1971) and Runner (1980a and b) for West Virginia lacked data on peak discharges at streamgage stations having drainage areas less than 50 mi2. These studies found that the lack of data for small drainage areas could be over-come by (1) not using the flood-frequency estimating methods for small drainage areas, (2) limiting the flood-frequency discharge estimates to small recurrence intervals, (3) increas-ing the record lengths for small drainages by using a rainfall-runoff model, or (4) using a composite analysis of long-term data (primarily stations with a minimum of 40 years of record) with an analysis of long-term data combined with short-term data for small drainage areas.
Frye and Runner (1969) estimated flood-frequency discharges for rural, unregulated streams in West Virginia by using equations presented in U.S. Geological Survey Water Supply Papers 1672 (Tice, 1968) and 1675 (Speer and Gamble, 1965). The nationwide flood-frequency discharge equations in these publications were developed for regional or major river basins. The authors suggested that the equations only be used for drainage areas greater than 50 mi2 in the Ohio River Basin and greater than 30 mi2 in the Potomac River Basin.
Frye and Runner (1970) presented a method for estimat-ing flood-frequency discharges using an analytical technique similar to that proposed by Benson (1962). Peak-discharge data from streamgage stations on rural, unregulated streams in West Virginia with a minimum of 10 years of record were analyzed. The authors suggested that the analytical techniques be used only for drainage areas greater than 50 mi2 because adequate data were not available.
Frye and Runner (1971) presented a method for esti-mating the 2-, 5-, and 10-year flood discharges for rural, unregulated streams in the Ohio River Basin of West Virginia. Data from a network of small streams with an average record length of 6 years were correlated with long-term data from streamgage stations to estimate additional years of peak dis-charges. The equations were applicable only to streams with drainage areas between 1 and 50 mi2.
Runner (1980a) presented equations for estimating the 2-, 5-, 10-, 25-, 50-, 100-, and 500-year flood discharges for rural, unregulated streams in West Virginia. The estimating equa-tions were used only for drainage areas of 0.3 to 2,000 mi2. The flood-frequency discharges in this study were made using methods recommended by the Interagency Advisory Commit-tee on Water Data (1976), including adjustments to station-frequency determinations by applying weighted regional and station skews. The peak-discharge data from 170 streamgage stations included data from Maryland and Virginia. Records of peak discharges for 15 stations with small drainage areas (ranging from 1.8 to 12.2 mi2) were synthesized to greater than 40 years of record (Runner, 1980b) by use of a rainfall-runoff model developed by Dawdy and others (1972). On the basis of regression analyses using 12 basin characteristics as indepen-dent variables, regional flood-frequency discharge equations were developed separately for stations with more than 40 years of record (including 15 small drainage-area streamgage stations for which at least 40-year records were estimated) and for all 170 stations. Three regions were delineated using an analysis of the regression residuals, and drainage area was determined to be the only statistically significant independent variable. A composite of the equations for stations with greater than 40 years of record and all 170 streamgage stations was determined.
This Study
To provide flood-related information and estimates needed for the design of structures that will meet existing or proposed safety standards, yet not incur excessive costs because of overdesign, the U.S. Geological Survey (USGS), in cooperation with the West Virginia Department of Transpor-tation, Division of Highways, revised previously developed equations for estimating the magnitude and frequency of flood discharges on rural, unregulated streams in West Virginia. The results of this study supersede those published by Wiley and others (2000, 2002).
This report presents newly revised equations for estimat-ing the discharges of the 1.1-, 1.5-, 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year recurrence interval floods (flood-frequency discharges) on rural, unregulated streams in West Virginia. A flood frequency is the reciprocal of the annual-occurrence probability (AOP), in percent, where the 100-year flood fre-quency is equal to the 1-percent AOP. This report documents the information used to estimate flood-frequency discharges and includes a list of regional floods in West Virginia; a discussion of climatic conditions affecting flooding; a presen-tation of results from previous studies; and an inventory of data sources containing peak discharges, basin characteristics, and skew coefficients. The statistical methods are described, including an accounting of error, which provides project designers with the associated uncertainty of flood discharge estimates determined from applying flood-frequency discharge equations to West Virginia streams.
Development of Flood-Frequency Discharge Equations 7
Development of Flood-Frequency Discharge Equations
Annual peak discharge data, basin characteristics data, and generalized West Virginia skew coefficients for 290 streamgages on rural, unregulated streams in West Virginia and adjacent states were analyzed to determine regional equa-tions to be used to estimate the magnitude of flood discharges for selected recurrence intervals. Basin characteristics, gener-alized West Virginia skew coefficients, and flood-frequency discharges for streamgage stations in adjacent states developed for this study do not supersede values used by adjacent states. The equations for the 100-year recurrence interval (1-percent AOP) flood discharges were regionalized by plotting the areal distribution of residuals determined by use of multiple and simple least-squares regression models. Independent variables describe basin characteristics (such as drainage area, mean annual precipitation, and percent forest cover) for each station location. Areal distributions of residual plots from regres-sions of the 100-year discharges were used to select stations in adjacent states to represent flood discharges expected in West Virginia and to determine regional boundaries. The initial regional equations for the selected recurrence intervals were derived with the use of multiple and simple least-square regression models and by determining the significance of inde-pendent variables. The final regional equations were derived with the use of a generalized least-square regression model and independent variables from the initial regional equations.
Peak Discharges
Annual peak discharges at 290 streamgage stations on rural, unregulated streams with a minimum of 9 years of record through the 2007 water year (the period beginning October 1 of the previous year through September 30 of the indicated year) in West Virginia and through the 2006 (2007 for some stations in Maryland) water year for stations in adjacent states were available for this study (fig. 3; table 1, at end of this report). Guidelines established by the Inter-agency Advisory Committee on Water Data (1982) required that streamgage used in the analysis have a minimum of 10 years of record, but stations with 9 years of record were accepted because the addition of six stations with drainage areas less than 30 mi2 was considered more beneficial to this study than adhering to the 10-year guideline. Annual-peak-discharge data are maintained in the U.S. Geological Sur-vey’s “Peak File” database available on the World Wide Web from the USGS United States NWIS-W Data Retrieval site (http://waterdata.usgs.gov/).
Peak discharges at the streamgage station Cheat River at Rowlesburg, identification number (ID) 121 in fig. 3 and streamgage station number (streamgage) 03070000 in table 1, are from a combination of records that include and exclude flow from the tributary stream Saltlick Creek. Peak-discharge
data collected at Rowlesburg prior to the flood of November 5, 1985, include flow from Saltlick Creek for a drainage area of 974 mi2. Peak-discharge data collected at Rowlesburg from Novem ber 6, 1985, through September 30, 1996, exclude flow from Saltlick Creek for a drainage area of 939 mi2. Streamgage station ratings (relations between stream stage and discharge) were dif ficult to define accurately after Novem-ber 5, 1985, because they were affected by scour throughout the range of stage. Peak discharges were not adjusted for the 4-percent differ ence in drainage area (typically necessary when records are combined) because the rating defi nition dif-ficulties resulted in peak discharges with much greater than 4 percent uncertainties.
Peak discharges at the streamgage station Right Fork Holly River at Guardian (ID 229 and streamgage 03195100) for the 1979 to 1982 water years, and peak discharges at the station Left Fork Holly River near Replete (ID 230 and streamgage 03195250) for the 1979 to 1982 and 1987 to 2007 water years were pro vided by the U.S. Army Corps of Engi-neers, Huntington District (Phillip E. Anderson, oral and writ-ten commun., 1997 and 1998; Charlotte L. Hazelett, written commun., 2007).
Peak discharges at the streamgage station Fernow Water-shed Number Four near Hendricks (ID 113 and streamgage 03067100) for the 1952 to 2006 water years were provided by the U.S. Forest Service, Fernow Experimental Forest (Fred-erica Wood, written commun., 2006 and 2007). No data were available for the 2007 water year at the time of this study.
Peak discharge records for the streamgage station Elk River below Webster Springs (ID 227 and streamgage 03194700) were lengthened using records for the station Elk River at Centralia (ID 228 and streamgage 03195000). Peak discharges at the station Twelvepole Creek below Wayne (ID 266 and streamgage 03207020) were lengthened using records for the station Twelvepole Creek at Wayne (ID 265 and streamgage 03207000). Peak discharges at the station Tug Fork at Kermit (ID 285 and streamgage 03214500) were lengthened using records for Tug Fork near Kermit (ID 284 and streamgage 03214000). Peak discharges at the station New River at Fayette (ID 207 and streamgage 03186000) were lengthened using records for New River at Caperton (ID 206 and streamgage 03185500); and peak discharges at the station Cheat River near Pisgah (ID 123 and streamgage 03071000) were lengthened using records for Cheat River near Mor-gantown (ID 124 and streamgage 03071500). Records were lengthened by estimating discharges using drainage-area ratios; the stations used to lengthen records were not consid-ered in the regression analysis.
Basin Characteristics
Characteristics of the basins draining to the 290 streamgage stations on rural, unregulated streams in West Virginia and adjacent states (Paybins, 2008) were available for use as independent variables in the regression analysis.
8 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
OHIO
PENNSYLVANIA
MARYLAND
VIRGINIA
KENTUCKY
78°W81°W
40°N
38°N
0 20 40 60 MILES
0 20 40 60 KILOMETERS
EXPLANATIONState boundary
County boundary
Major stream
Streamgage station and identification number212
Base from U.S. Geological Survey 1:100,000 digital line graphics for state boundaries and streams and from the West Virginia Department of Environmental Protection 1:24,000 digital data for county boundaries. Universal Transverse Mercator projection, zone 17, NAD 83.
9
865
321
99
98
9796 95
9493
92
91
90
89
87
8685
84
83
8281
80
79
7877
76
75
74
7372
71
7069
6867
66
65
6463
62
616059
5857
56
5554
53 525150
4948
47
46
45
44
43
4241
39, 40
38
37
35,363433
32
31
3029
2827
26
23
2221
19, 20
18
1716
1514
13
1211
10
290
289
288
287
286
285284
283
282281
280279
278277
275274
273
272
271270
269268267
266265
264
263
262
261260
259
258
257256
255254
253
252 251
250
249
248
247 246245
244
243242241 240
239
238
237
236
235
234
233
232231
230229228
226
225
224
223222 221 220
219218
217216
214213
212
211 210
209 208
207206
205204
203 202
201200
199198
197
196
195194
193
192
191190189
188
186
185
184
183
182181
180179
178
177
176
175
174
173172
171170
169168
167166
165
164
163162
160
159
158
157156
155154
153
149, 150, 151, 152
148
147 146
145144143
142141
139, 140 138
137
136
135
134
133
132
131130
129
128127
126125
124
123122
121120
119118
116115
114
113
112 111
109
108
106
105104
103102
101
4, 7
88
24, 25
276
227
215
187
161
117 110
107
100
Figure 3. The 290 U.S. Geological Survey streamgage stations in West Virginia and adjacent states considered in the estimation of flood-frequency discharges in West Virginia. (Identification numbers are cross-references with streamgage-station names and numbers in table 1.)
Development of Flood-Frequency Discharge Equations 9
The 36 basin characteristics evaluated for use in this study are the following: drainage area (DRNAREA), in mi2 (Mathes, 1977; Wilson, 1979; Mathes and others, 1982; Preston and Mathes, 1984; Stew art and Mathes, 1995; Wiley, 1997; Wiley and others, 2007); latitude of the basin centroid, in decimal degrees; longitude of the basin centroid, in decimal degrees; basin perimeter, in mi; basin slope, in ft/mi; basin relief, in ft; basin orientation, in degrees; channel length, in mi; valley length, in mi; channel slope, in ft/mi; stream length, in mi; mean basin elevation, in ft; 24-hour 2-year rainfall, in inches; annual precipitation, in inches; January minimum temperature, in degrees Fahrenheit; annual snow depth, in inches; forest cover, in percent; grassland cover, in percent; barren land cover, in percent; urban land cover, in percent; wetland cover, in percent; open-water cover, in percent; agriculture cover, in percent; impervious cover, in percent; basin width, in mi; shape factor, dimensionless; elongation ratio, dimensionless; rotundity of basin, dimensionless; compactness ratio, dimen-sionless; relative relief, in ft/mi; sinuosity ratio, dimensionless; stream density, in mi/mi2; channel maintenance, in mi2/mi; slope proportion, dimensionless; ruggedness number, in ft/mi; and slope ratio, dimensionless.
Correlation of Basin Characteristics
The basin characteristics were log10 transformed and evaluated for linear correlation by using a Pearson coefficient, or Pearson’s r (Helsel and Hirsch, 2002). The numeral one was added to values of grassland cover, barren land cover, urban land cover, wetland cover, open-water cover, agriculture cover, and impervious cover to ensure that values were greater than zero for log10 transformation. To decrease values for regres-sion analysis, 77 was subtracted from longitude of the basin centroid, and 37 was subtracted from latitude of the basin centroid.
Basin characteristics were considered highly correlated where the absolute value of the Pearson coefficient was greater than or equal to 0.80. The following characteristics were highly correlated within each group: drainage area, basin perimeter, channel length, valley length, basin width, stream length, compactness ratio, and slope proportion; channel slope, relative relief, and slope ratio; shape factor, elongation ratio, and rotundity of basin; basin relief and ruggedness number; valley length and basin relief; and urban land cover and imper-vious cover.
The Pearson coefficient was equal to the numeral one (singularity) for some combinations of basin characteristics including stream density and channel maintenance; shape factor, elongation ratio, and rotundity of basin; drainage area, basin width, shape factor, and rotundity of basin; and stream length, compactness ratio, relative relief, stream density, and ruggedness number. The characteristics elongation ratio, rotundity of basin, channel maintenance, and basin width
were removed from consideration for regression because of singularity.
The number of basin characteristics considered for regression was reduced from 36 to 32 with the removal of the characteristics because of singularity. Additional characteris-tics having singularity were removed if they became signifi-cant in the regression analysis.
West Virginia Skew Coefficients
Atkins and others (2009) determined generalized skew coefficients applicable to West Virginia, the WV skew, to supersede the U.S. skew presented by the Interagency Advi-sory Committee on Water Data (1982) (table 1, at the end of this report). The generalized skew coefficient is a regional measure (of individual streamgage-station skews) of the fit-ness of annual-peak discharges to a Pearson Type III prob-ability curve. The WV skew coefficients used in this current study do not supersede values used for studies in adjacent states but are applicable only to analyses in West Virginia. The difference between the WV- and U.S.-skew coefficients (WV skew minus U.S. skew) ranged from -0.493, unitless, for Brier Creek at Fanrock (ID 255 and streamgage 03202480) to 0.491, unitless, for Dry Fork at Hendricks (ID 110 and streamgage 03065000).
A direct relation was not observed between the differ-ence between the WV- and U.S.-skew coefficients and the difference between the flood-frequency discharge calculations made using the WV- and U.S.-skew coefficients. (Skew coef-ficients are weighted and adjusted using systematic years of record, systematic skews, low- and high-outlier criterion, and historic years to determine flood frequencies.) The 100-year flood discharges determined in this study using the WV skew were compared to the 100-year flood discharges calculated using the U.S. skew. The differences in the 100-year flood discharges (discharge using WV skew minus discharge using U.S. skew, divided by discharge using WV skew, times 100) ranged from -23.8 percent for Marsh Fork at Maben (ID 253 and streamgage 03202245) to 13.3 percent for Job Run near Wymer (ID 109 and streamgage 03063950). An area of large negative differences was observed for the headwaters of the Coal, Guyandotte, and Tug Fork Rivers near the southern border of the State, and an area of large positive differences was observed for the headwaters of the South Branch Potomac River near the eastern border of the State. The difference for Brier Creek at Fanrock (ID 255 and streamgage 03202480) is -14.3 percent (-0.493, unitless, difference in skews discussed above), and the difference for Dry Fork at Hendricks (ID 110 and streamgage 03065000) is 3.8 percent (the 0.491, unitless, difference in skews discussed above); these streamgage sta-tions are located near the southern and north-central areas of the State, respectively.
10 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
Flood-Frequency Discharges
The flood-frequency discharges at the 290 streamgage stations on rural, unregulated streams were determined fol-lowing the guidelines established by the Interagency Advisory Committee on Water Data (1982). The U.S. Geological Survey computer program PeakFQ (Flynn and others, 2006) was used to compute the flood-frequency discharges. In the analysis of flood-frequency discharges for adjacent states, information from previous studies was used (Bisese, 1995; Dillow, 1996; Stuckey and Reed, 2000; Hodgkins and Martin, 2003; and Koltun, 2003) as a reference for determining flood-frequency discharges calculated with the WV skew for use in this current study.
The log10-transformed systematic (continuous record or broken record that can be statistically treated as a continu-ous record) annual-peak series for each streamgage station was fitted to the Pearson Type III probability curve. Regional general skew (WV skew) was obtained from the map devel-oped by Atkins and others (2009). Regional general skew is weighted with station skew to determine a final adjustment to the Pearson Type III probability curve. Additionally, high-outlier, low-outlier, and historical peak assessments were made to adjust the annual-peak series. Mixed populations, such as floods from snowmelt and those from tropical storms or hurricanes, were not analyzed separately. Selected statis-tics from the flood-frequency discharge analyses for the 290 streamgage stations in West Virginia and adjacent states are listed in table 2 (at the end of this report). Flood-frequency discharges determined following the guidelines established by the Interagency Advisory Committee on Water Data (1982) for 10 recurrence intervals for the 290 streamgage stations in West Virginia and adjacent states are identified as Qs in table 3 (also at the end of this report); the 10 recurrence intervals are the 1.1- (90-percent AOP), 1.5- (67-percent AOP), 2- (50-percent AOP), 5- (20-percent AOP), 10- (10-percent AOP), 25- (4-per-cent AOP), 50- (2-percent AOP), 100- (1-percent AOP), 200- (0.5-percent AOP), and 500-year (0.2-percent AOP).
The PeakFQ computer program does not output flood-fre-quency discharges for all the recurrence intervals needed for this study. However, subroutines within PeakFQ (the HARTIV subroutine with related subroutines and functions, originally developed by Kirby, 1980) were used to calculate the needed flood-frequency discharges. The 1.1-year and sometimes the 1.5-year flood discharges were computed for 15 streamgage stations using the PeakFQ subroutines; these discharges are footnoted in table 3 (at the end of this report). The identified subroutines within PeakFQ do not calculate discharge directly, but determine a frequency factor (K or “the K value”) that is used to calculate the discharge. A short Fortran computer pro-gram (Wiley and others, 2002, Appendix 1) was used to calcu-late all the frequency factors using the Bulletin-17B weight-ing procedures and the WV skew (Atkins and others, 2009) (table 1, at the end of this report). The short computer program uses the current versions of computer subroutines contained in a library of USGS water-resources application programs (U.S.
Geological Survey, 2001). The frequency factors are used to determine discharge by computing the antilog of discharge from the following modified equation (Interagency Advisory Committee on Water Data, 1982, equation 1, p. 9):
Log10 Q = Xmean + KSP , (1)
where
Xmean = ∑ X / N, (2)
where X is the log10-transformed annual peak
discharges (Bulletin-17B adjusted), in ft3/s; and
N is the number of years of peak-discharge record, unitless;
K is the frequency factor, unitless; and SP is the standard deviation of the log10-
transformed annual peak discharges (Bulletin-17B adjusted), in ft3/s:
[∑ (X – Xmean)2 / (N – 1)]0.5. (3)
Typically, the magnitude of a flood-frequency discharge increases with increasing drainage area. For floods with recur-rence intervals greater than 10 years, however, the flood-fre-quency discharges calculated for the streamgage station Tygart Valley River near Dailey (ID 83 and streamgage 03050000) are greater than those for the station Tygart Valley River near Elkins (ID 84 and streamgage 03050500), although the drainage area for Tygart Valley River near Dailey (185 mi2) is smaller than the drainage area for Tygart Valley River near Elkins (271 mi2) (tables 2 and 3, at the end of this report). This inconsistency may be due to the wide floodplain along the river between Daily and Elkins, which contrasts with the more mountainous and narrower floodplains upstream from Daily and, therefore, increases the stream storage and attenuates the flood peak. The inconsistency also may occur because the frequency analysis for each station is based on different time periods, thus creating a time-sampling error.
Wiley and others (2000) investigated data for the streamgage station Poplar Fork at Teays (ID 248 and streamgage 03201410) for nonhomogeneity. The study concluded that the data for the period 1967 to 1978 indicate annual peaks were higher than those for 1992 to 1997, but collection of additional years of record would be necessary to resolve the question of nonhomogeneity. This current study determined that nonhomogeneity exists between the periods 1967 to 1978 and 1992 to 2007. It is hypothesized that exces-sive runoff from nearby impervious areas resulted in higher annual peaks for the period 1967 to 1978. The excessive run-off no longer affects annual peaks since the streamgage station was moved to a location upstream from the nearby impervious areas for the period 1992 to 2007. The flood-frequency dis-charges for Popular Fork at Teays were determined using only
Development of Flood-Frequency Discharge Equations 11
annual peaks for the period 1992 to 2007 because they better represent a rural, unregulated stream.
The randomness of the systematic annual-peak series was statistically tested to detect a trend using Kendall’s test for correlation (Kendall, 1975; Hirsch and others, 1982). The computer program SWSTAT (Surface Water STATistics), ver-sion 4.1, dated February 25, 2002, (Lumb and others, 1990; A.M. Lumb, W.O. Thomas, Jr., and K.M. Flynn, USGS, writ-ten commun., titled “Users manual for SWSTAT, a computer program for interactive computation of surface-water statis-tics,” June 15, 1995) was used to calculate Kendall’s tau and the level of significance (the probability or p-value). For the Kendall’s test for correlation, the hypothesis that there is no trend is tested. If the hypothesis fails to attain a particular level of significance, the hypothesis of no trend is rejected. For this study, the particular level of significance selected was 0.05, so a trend is determined for an annual-peak series if the level of significance is less than 0.05. Kendall’s tau and the level of significance were determined for the annual-peak series of 246 streamgage stations (44 stations were eliminated from consideration as part of the regression analysis discussed later in this report) in West Virginia (table 2). Streamgage stations were further limited to the 125, those with a minimum of 30 years of record, to eliminate affects that might be due to natural climatic variations (U.S. Geological Survey, 2005). The annual-peak series for 12 streamgage stations (about 10 percent of the 125 stations) indicated a trend, 7 positive and 5 negative. If chance were the only factor, 6 streamgage sta-tions would be expected to indicate a trend (about 5 percent of the 125 stations). Statistics indicate trends at twice as many streamgage stations as would be expected by chance, but the trends were nearly equally divided between stations with posi-tive and negative values. Therefore, no significance could be determined for the trends indicated at the 12 stations.
Regional Regression of Flood-Frequency Discharges
Regression models with the 10 log10-transformed flood-frequency discharges as dependent variables and the 36 log10-transformed basin characteristics as potential indepen-dent variables were evaluated. The flood-frequency equations for the 100-year recurrence interval (1-percent AOP) were regionalized by plotting the areal distribution of residuals from the application of multiple and simple least-squares regres-sion models. Regional regression procedures were performed using the computer program S-PLUS 7.0 (Insightful Corpora-tion, 2005), a commercially available statistical computing package. Areal distributions of residual plots indicated three regions—Eastern Panhandle, Central Mountains, and West-ern Plateaus—with drainage area (DRNAREA) as the only significant independent variable (fig. 4). Initial equations for all flood-frequency discharges were determined using the regions determined by analysis of the 100-year flood, and the outcomes of all equations identified DRNAREA as the only significant independent variable. (A regional analysis of the
2-year floods agreed with the regional divisions determined by analysis of the 100-year floods.) The final regional equations were then developed from application of a generalized least-square (GLS) regression model (Stedinger and Tasker, 1985; Tasker and Stedinger, 1989) (U.S. Geological Survey com-puter program GLSNet, version 4.0) for the three regions with DRNAREA as the only independent variable (table 4).
The three regions—Eastern Panhandle, Central Moun-tains, and Western Plateaus (fig. 4)—are separated by topo-graphic features. The boundary between the Eastern Panhandle and Central Mountains Regions follows the Potomac River Basin boundary. The Central Mountains Region (from north-east to southwest) contains the drainage areas of the Cheat River, Tygart Valley River (including the Buckhannon River), Elk River upstream from the confluence of Birch River, and the New and Gauley Rivers upstream of the Kanawha River. The Western Plateaus Region encompasses the remainder of the State.
Forty-four streamgage stations were removed from the regression analysis (table 1, at the end of this report), including 12 stations in West Virginia. Thirty-two stations in adjacent states were removed primarily because residual plots indicated that the stations were not representative of flows expected in West Virginia, except for Potomac River at Hancock (ID 34 and streamgage 01613000), Shepherd-stown (ID 44 and streamgage 01618000), and Point Of Rocks (ID 70 and streamgage 01638500) in Maryland where the flood-frequency discharges at these streamgage stations with large drainage areas (4,075 to 9,651 mi2) leveraged the regional regression equations, resulting in greater estimation errors for small drainage areas. The 12 streamgage stations removed from the regression analysis in West Virginia are Tuscarora Creek above Martinsburg (ID 42 and streamgage 01617000) because the station was located in a karst area of the State (equations developed in this current study are not applicable to karst areas of the state); Elk River at Centralia (ID 228 and streamgage 03195000) because the peak record for this station was used to lengthen the record for Elk River below Webster Springs (ID 227 and streamgage 03194700); Twelvepole Creek at Wayne (ID 265 and streamgage 03207000) because the peak record for this station was used to lengthen the record for Twelvepole Creek below Wayne (ID 266 and streamgage 03207020); Tug Fork near Kermit (ID 284 and streamgage 03214000) because the peak record for this station was used to lengthen the record for Tug Fork at Kermit (ID 285 and streamgage 03214500); New River at Caperton (ID 206 and streamgage 03185500) because the peak record for this station was used to lengthen the record for New River at Fayette (ID 207 and streamgage 03186000); Cheat River near Morgantown (ID 124 and streamgage 03071500) because the peak record for this station was used to lengthen the record for Cheat River near Pisgah (ID 123 and streamgage 03071000); and Potomac River at Paw Paw (ID 28 and streamgage 01610000), Shenandoah River at Millville (ID 66 and streamgage 01636500), New River at Bluestone Dam (ID 188 and streamgage 03180000), New River at
12 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
OHIO
PENNSYLVANIA
MARYLAND
VIRGINIA
KENTUCKY
78°W81°W
40°N
38°N
0 20 40 60 MILES
0 20 40 60 KILOMETERS
EXPLANATIONEastern-Panhandle Region
Central-Mountains Region
Western-Plateaus Region
State boundary
County boundary
Major stream
Base from U.S. Geological Survey 1:100,000 digital line graphics for state boundaries and streams and from the West Virginia Department of Environmental Protection 1:24,000 digital data for county boundaries. Universal Transverse Mercator projection, zone 17, NAD 83.
Randolph
Kanawha
Greenbrier
Hardy
Fayette
Preston
Grant
Pocahontas
Raleigh
Boone
Roane
Wayne
Nicholas
Clay
Logan
Pendleton
Webster
MasonBraxton
Wood
Lewis
Mingo
RitchieTucker
Monroe
Jackson
Hampshire
Mercer
Lincoln
Wetzel
Wirt
Wyoming
McDowell
Tyler
UpshurGilmer
Harrison
Putnam
Cabell
Marion
Barbour
Mineral
Summers
Berkeley
Marshall
Calhoun
MonongaliaMorgan
Taylor
Ohio
DoddridgeJefferson
Pleasants
Brooke
Hancock
Figure 4. The Eastern Panhandle, Central Mountains, and Western Plateaus Regions of West Virginia for which equations for estimation of flood frequency discharges were developed in this study.
Development of Flood-Frequency Discharge Equations 13
Table 4. Equations used to estimate selected flood-frequency discharges for streams in the Eastern Panhandle, Central Mountains, and Western Plateaus Regions of West Virginia.
[PK(n_n), peak discharge in cubic feet per second for the (n.n)-year recurrence interval; PK(n), peak discharge in cubic feet per second for the (n)-year recur-rence interval; %, percent; AOP, annual-occurrence probability; DRNAREA, drainage area in square miles]
EquationStandard error of the model,
in percent
Average standard error of sampling,
in percent
Average prediction error,
in percent
Equivalent years of record, unitless
Eastern Panhandle Region (Range in DRNAREA from 0.21 to 1,461 for 57 streamgage stations)
PK1_1(90%AOP) = 29.6 DRNAREA 0.818 43.4 10.3 44.8 3.4
PK1_5(67%AOP) = 46.4 DRNAREA 0.828 35.7 8.9 36.9 3.3
PK2(50%AOP) = 59.8 DRNAREA 0.832 32.1 8.6 33.4 4.1
PK5(20%AOP) = 105 DRNAREA 0.838 25.6 8.9 27.2 10.6
PK10(10%AOP) = 145 DRNAREA 0.842 22.5 9.5 24.5 19.1
PK25(4%AOP) = 204 DRNAREA 0.848 19.7 10.3 22.4 34.1
PK50(2%AOP) = 254 DRNAREA 0.852 18.6 11.1 21.7 46.1
PK100(1%AOP) = 307 DRNAREA 0.855 18.3 11.6 21.7 56.7
PK200(0.5%AOP) = 365 DRNAREA 0.859 18.4 12.4 22.4 64.7
PK500(0.2%AOP) = 447 DRNAREA 0.864 19.4 13.5 23.8 70.9
Central Mountains Region (Range in DRNAREA from 0.10 to 1,619 for 83 streamgage stations)
PK1_1(90%AOP) = 33.4 DRNAREA 0.914 40.0 8.3 41.0 2.4
PK1_5(67%AOP) = 53.8 DRNAREA 0.887 34.6 7.3 35.4 2.0
PK2(50%AOP) = 69.4 DRNAREA 0.873 33.4 7.3 34.2 2.1
PK5(20%AOP) = 116 DRNAREA 0.845 34.1 8.0 35.1 3.2
PK10(10%AOP) = 153 DRNAREA 0.831 36.3 8.6 37.4 4.0
PK25(4%AOP) = 206 DRNAREA 0.816 39.9 9.8 41.2 4.8
PK50(2%AOP) = 250 DRNAREA 0.807 42.9 10.6 44.4 5.3
PK100(1%AOP) = 297 DRNAREA 0.800 46.2 11.3 47.9 5.6
PK200(0.5%AOP) = 347 DRNAREA 0.793 49.7 12.0 51.5 5.9
PK500(0.2%AOP) = 420 DRNAREA 0.785 54.3 13.1 56.3 6.1
Western Plateaus Region (Range in DRNAREA from 0.13 to 1,516 for 106 streamgage stations)
PK1_1(90%AOP) = 56.9 DRNAREA 0.763 38.2 7.6 39.1 3.8
PK1_5(67%AOP) = 97.8 DRNAREA 0.741 33.4 6.5 34.1 2.8
PK2(50%AOP) = 129 DRNAREA 0.730 31.6 6.1 32.2 2.8
PK5(20%AOP) = 221 DRNAREA 0.710 29.3 6.5 30.0 4.4
PK10(10%AOP) = 292 DRNAREA 0.699 28.9 6.5 29.7 5.9
PK25(4%AOP) = 391 DRNAREA 0.688 29.4 7.3 30.3 7.9
PK50(2%AOP) = 472 DRNAREA 0.681 30.2 7.6 31.3 9.1
PK100(1%AOP) = 557 DRNAREA 0.674 31.4 8.0 32.5 10.1
PK200(0.5%AOP) = 647 DRNAREA 0.668 32.7 8.3 33.9 10.8
PK500(0.2%AOP) = 775 DRNAREA 0.661 34.8 8.9 36.1 11.4
14 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
Hinton (ID 203 and streamgage 03184500), New River at Fay-ette (ID 207 and streamgage 03186000), and Kanawha River at Kanawha Falls (ID 224 and streamgage 03193000) because the flood-frequency discharges at these stations with large drainage areas (4,602 to 8,371 mi2) leveraged the regional regression equations, resulting in greater estimation errors for small drainage areas.
Accuracy of Flood-Frequency Discharge Equations
The accuracy of equations used to estimate discharge is quantified by calculating the average prediction error (Tasker and Stedinger, 1989; Hodge and Tasker, 1995) and equivalent years of record (Hardison, 1969, 1971). Average prediction error is the square root of the sum of the squared standard error of the model (the portion of the total error due to an imperfect model) and the average squared standard error of sampling (the portion of the total error due to estimating model parameters from a sample), in log units. The average prediction errors range from 21.7 to 56.3 percent (table 4). The average prediction error is within 3.4 percentage points of the standard error of the model for all regression equa-tions, indicating that addition of the average standard error of sampling to the standard error of the model accounts for very little additional unexplained variance of the flood-frequency discharge estimate.
Also, the average prediction error is the square root of the average of individual squared standard errors of predic-tion. Individual standard errors of prediction for the regres-sion equations shown in table 4 were computed over the entire range of applicable drainage areas and compared to the average prediction errors (fig. 5). The x-axis of figure 5 is not to scale because the minimum and maximum drainage areas are unequal among regions. The individual standard errors of prediction were computed using the matrices presented in Appendix 1 and methods described by Hodge and Tasker (1995, p. 37–42), Wiley and others (2000, Appendix 1), Wiley and others (2002, Appendix 2), and Koltun (2003, Appendix A). The individual standard errors of prediction increase for drainage areas less than and greater than about 100 mi2 (where the individual standard errors are 1.0 percent-age point less than average prediction error) for all regression equations. The maximum individual standard errors of predic-tion for the maximum drainage areas are within 0.5 percent-age point of the average standard error of prediction for all regression equations. The maximum individual standard errors of prediction for the minimum drainage areas are less than 5.8 percentage points greater than the average prediction error for all regression equations. The individual standard errors of prediction are about equal (within 0.3 percentage point) to the average prediction error at 10 mi2 for all regression equations. In summary, the individual standard errors of prediction are within 1.0 percentage point of the average prediction error for drainage areas greater than 10 mi2, and the individual standard
errors of prediction increase to a maximum of 5.8 percentage points greater than the average standard error of prediction for the minimum drainage areas.
It is not necessary to compute the individual standard errors of prediction when using the regression equations developed in this study for drainage areas greater than or equal to about 10 mi2 because the differences between the individual standard errors of prediction and average prediction error are insignificant (within 1.0 percentage point). Also, it is not nec-essary to compute the individual standard errors of prediction for drainage areas less than about 10 mi2 if an additional error of up to 5.8 percentage points (the maximum of individual standard errors of prediction for the minimum drainage areas) is acceptable for the particular application.
Equivalent years of record (table 4) is an estimate of the number of systematic years of record that must be collected at a streamgage station to calculate flood-frequency discharges with an accuracy equal to that of the regional equation. The equivalent years of record ranged from 2.0 to 70.9 years. The equivalent years of record is not a direct measurement of accuracy between equations of flood-frequency discharges. A comparison of the equation for PK1_1 (90% AOP) to that for PK25 (4% AOP) in the Eastern Panhandle Region shows that the equivalent years of record increased 10 times (3.4 to 34.1), but the average prediction error decreased only by half (44.8 to 22.4). Equivalent years of record is a weighting factor that is applied when determining flood-frequency discharges at streamgage stations.
The high values for the equivalent years of record in the Eastern Panhandle Region are atypical compared to values for flood-frequency equations in surrounding states and the previous study in West Virginia. The atypical high values are probably due to (1) a good correlation with the distance
6
4
2
0
-2
-4
-6
DIFF
EREN
CES,
IN P
ERCE
NT
DRAINAGE AREA, IN SQUARE MILES
Regionalminimum
Regionalmaximum
10 100
NOT TO SCALE
Figure 5. Range of differences (shaded) of the individual standard errors of the prediction from the average prediction errors for the indicated drainage areas. The graph represents all regional equations.
Procedures For Estimating Flood-Frequency Discharges 15
between stations for weighting in the GLS regression com-pared to the correlations for other regions in this study; (2) unusually low residuals for short-term streamgage stations (less than 15 years) that have small drainage areas (less than 5 mi2) compared to residuals for other regions in this study, the previous study in West Virginia, and regression studies for other hydrologic statistics conducted by the authors; and (3) the longer average record length for stations in the Eastern Panhandle Region (41) compared to average record lengths in the Central Mountains (39) and Western Plateaus (33).
Procedures For Estimating Flood-Frequency Discharges
Estimating procedures for the 1.1- (90-percent AOP), 1.5- (67-percent AOP), 2- (50-percent AOP), 5- (20-percent AOP), 10- (10-percent AOP), 25- (4-percent AOP), 50- (2-percent AOP), 100- (1-percent AOP), 200- (0.5-percent AOP), and 500-year (0.2-percent AOP) flood discharges were devel-oped for streamgage stations and ungaged locations in West Virginia.
At a Streamgage Station
A flood-frequency discharge at a streamgage station is determined by reading the weighted (Qw) value directly from table 3 (at the end of this report). This discharge was calculated by weighting (1) the discharge determined from the systematic and historical record (Qs in table 3), using the guidelines established by the Interagency Advisory Committee on Water Data (1982) with the WV skew, and (2) the discharge determined by the appropriate regional regression equation (Qr in table 3). The weighting technique considers (1) the number of years of peak-discharge record which equals the number of years of systematic record, plus the number of histori-cal peaks, minus the number of high-outlier peaks (values from table 2, at the end of this report), and (2) the number of equivalent years of record (an estimate given in table 4 of the number of systematic years of record for a streamgage station necessary to calculate flood-frequency discharges with an accuracy equal to that of the regional regression equation). The following equation was used.
Qw = (Qs N + Qr EY) / (N + EY) , (4)
where Qw is the weighted discharge, in ft3/s; Qs is the flood-frequency discharge determined
from the systematic and historical record using the guidelines established by the Interagency Advisory Committee on Water Data (1982), in ft3/s;
Qr is the flood-frequency discharge determined from the appropriate regional equation, in ft3/s;
N is the number of years of peak-discharge record, unitless; and
EY is the equivalent years of record, unitless.
No weighted value was calculated for one of the two streamgage stations on the same stream that were combined into a single time-series record; the flood-frequency discharge near (at) the streamgage station without a weighted value is to be determined using procedures for an ungaged location. No weighted value was calculated for Tuscarora Creek above Martinsburg (ID 42 and streamgage 01617000) because the streamgage station is located in a karst area of the State; the frequency discharge of the systematic record (Qs) is to be used at this station.
At an Ungaged Location
Four different procedures are used to determine a flood-frequency discharge at an ungaged location (1) when the ungaged location is upstream from a streamgage sta-tion, (2) when the ungaged location is downstream from a streamgage station, (3) when the ungaged location is between two streamgage stations on the same stream, and (4) when the ungaged location is not on the same stream as a streamgage station. Two locations were considered to be on the same stream when the stream path from the downstream location to the basin divide followed the stream segment with the largest drainage area at each stream confluence and passed through the upstream location.
It is necessary to determine if the ungaged location is near a streamgage station, and arithmetic methods are used to quantify the definition of “near.” A drainage-area-ratio method for estimating statistics at ungaged locations has been used by several researchers, including Hayes (1991), Ries and Friesz (2000), Flynn (2003), and Wiley (2008). The ratio of the drainage areas (RU/K) is defined as the ratio of the drain-age area where the flood-frequency discharge is unknown (AU) to the drainage area where the flood-frequency discharge is known (AK). These researchers use arithmetic methods for determining the upstream and downstream limits of the range of drainage-area ratios over which flood-frequency discharges can be accurately estimated from those at a streamgage station using an equation similar to the following:
QU = QK (RU/K)EX , (5)
where QU is the unknown flood-frequency discharge, in
ft3/s; QK is the known flood-frequency discharge, in
ft3/s;
16 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
RU/K is the ratio of the drainage area at the location of the unknown flood-frequency discharge (AU) to the drainage area at the location of the known flood-frequency discharge (AK), unitless; and
EX is the exponent for the particular flood-frequency discharge, unitless.
The 1.1-, 1.5-, 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year flood discharges at 88 pairs of streamgage stations located on the same stream in West Virginia and adjacent states (table 5, at the end of this report) were evaluated to quantify “near” for application of the drainage-area-ratio method in this study. Two computations, one upstream and one downstream, were made for each pair of stations. Ratios of the drainage areas for the 176 computations ranged from 0.038 to 26.4. Equation 5 was solved for the exponent (EX) as the dependent variable:
Log10 (QU / QK) = EX (Log10 (RU/K)) . (6)
The exponent was evaluated for the 88 pairs of streamgage stations for each flood-frequency discharge using simple linear regression with no intercept (regression line goes through the graph origin). The values of the exponent (EX) for the flood-frequency discharges ranged from 0.68 to 0.79 (table 6).
The upstream and downstream limits for application of drainage-area ratios used to quantify the definition of “near” were determined by plotting the x-axis as the drainage-area ratios and the y-axis as the absolute percent differences between the flood-frequency discharges at the streamgage station (Qw) and the flood-frequency discharges estimated by applying (1) the drainage-area-ratio method and (2) the regional equations (Qr). S-PLUS 7.0 was used to construct locally weighted regression (LOESS) curves (a data-smooth-ing technique) through differences between flood-frequency discharges computed from streamgage-station records and the estimated values (selected LOESS parameters were “span = 0.5; degree = one, locally linear fitted; family = Symmetric, no feature for handling outlier distortions, strictly applying locally linear fitting”). The absolute percent differences for estimates of the 100-year flood made by applying the drain-age-area-ratio method are lower than the estimates made by applying the regional equation at drainage-area ratios greater than about 0.40 (fig. 6). Similar results were determined for all flood frequencies estimated in this study, and absolute percent differences for all equations were combined to determine ratio limits applicable for all flood frequencies (fig. 7). The upstream limit used to quantify the definition of “near” for all flood frequencies was determined to be 0.40, and the down-stream limit was set to the maximum ratios studied, 26.4, because no assessment could be made for ratios greater than 26.4 (table 6).
The downstream limit of 26.4 for application of drainage-area ratios determined in this study is much greater than values determined by Hayes (1991), Ries and Friesz (2000), and Flynn (2003), probably because the streamgage stations used to compute ratios in this study were limited to those on the same stream (the stream path from the downstream loca-tion to the basin divide followed the stream segment with the largest drainage area at each stream confluence and passed through the upstream location). The downstream limit of 26.4 determined in this study is much greater than the value of 4.76 determined by Wiley (2008), but both studies used LOESS plots to set the downstream limit to the maximum ratio studied.
The upstream limit of 0.40 for application of drainage-area ratios determined in this study was equal to that deter-mined by Wiley (2008) for flood frequencies at and below the 10-year recurrence interval. The upstream limit of 0.21 for flood frequencies at and above the 25-year recurrence interval determined by Wiley (2008) is superseded by the value 0.40 determined in this study because more than three times as many pairs of stations were used to determine the value in this study (26 pairs compared to 88 pairs).
Table 6. Values of the exponent, and upstream and downstream limits of the drainage-area ratios used to quantify the definition of “near” for estimating selected flood-frequency discharges for ungaged locations in West Virginia.
[EX, exponent; RUS, upstream limit of the drainage-area ratio; RDS, down-stream limit of the drainage-area ratio; PK(n_n), peak discharge in cubic feet per second for the (n.n)-year recurrence interval; PK(n), peak discharge in cubic feet per second for the (n)-year recurrence interval; %, percent; AOP, annual-occurrence probability]
Statistic EX RUS RDS
PK1_1(90%AOP) 0.79 0.40 26.4
PK1_5(67%AOP) .76 .40 26.4
PK2(50%AOP) .75 .40 26.4
PK5(20%AOP) .73 .40 26.4
PK10(10%AOP) .72 .40 26.4
PK25(4%AOP) .71 .40 26.4
PK50(2%AOP) .70 .40 26.4
PK100(1%AOP) .70 .40 26.4
PK200(0.5%AOP) .69 .40 26.4
PK500(0.2%AOP) .68 .40 26.4
Procedures For Estimating Flood-Frequency Discharges 17
Upstream limit of the drainage-area ratios used to quantify the definition of "near" for estimating statistics is 0.40
Drainage-area ratiosRegional equations
0.0 0.1 1.0 10.0 100.0
RATIO OF DRAINAGE AREAS, UNITLESS
50
100
150
200
ABSO
LUTE
DIF
FERE
NCE
, IN
PER
CEN
T
0
Figure 6. LOESS curves of the absolute difference between the 100-year (1-percent annual-occurrence probability) flood discharges determined at streamgage stations and values estimated from the (1) drainage-area ratio method and (2) regional equations, in relation to the ratios of the drainage areas.
0.01 0.10 1.00 10.00 100.00
RATIO OF DRAINAGE AREAS, UNITLESS
0
50
100
150
200
ABSO
LUTE
DIF
FERE
NCE
, IN
PER
CEN
T
Drainage-area ratiosRegional equations
Upstream limit of the drainage-area ratios used to quantify the definition of "near" for estimating statistics is 0.40
Figure 7. LOESS curves of the absolute difference between the 1.1- through 500-year (90- through 0.2-percent annual-occurrence probabilities) flood discharges determined at streamgage stations and values estimated from the (1) drainage-area ratio method and (2) regional equations, in relation to the ratios of the drainage areas.
18 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
Upstream From a Streamgage Station This procedure is used when there is a streamgage station
downstream from the ungaged location but none upstream on the same stream. The hydrologic assumption for this circumstance is that the conditions affecting flood-frequency discharges, such as land cover, basin topography, and climatic conditions, are unchanged upstream from the streamgage sta-tion. Mathematically, the values of flood-frequency discharges are proportioned by drainage area. It is suggested that a streamgage be established when RU/K is less than or equal to the upstream limit of the ratio of drainage areas (RUS) (table 6). The following equation is used to estimate flood-frequency discharges:
QU = QK (RU/K)EX , (7)
where QU is the unknown flood-frequency discharge,
in ft3/s; QK is the known flood-frequency discharge
(table 3), in ft3/s; RU/K is the ratio of the drainage area at the location
of the unknown flood-frequency discharge (AU) to the drainage area at the location of the known flood-frequency discharge (AK), unitless; and
EX is the exponent for the particular flood-frequency discharge (table 6), unitless.
In this method, it is not assumed that the conditions affecting flood-frequency discharges change in the upstream direction toward the regional tendency. The critical situation for this assumption is where the unknown location approaches the headwaters of a stream. This assumption might be accept-able if the flood-frequency discharge at the known location is less than that estimated by applying the regional equation at the known location because the upstream estimate of the flood-frequency discharge would be greater, and therefore, more conservative from a flood inundation perspective than that determined using the method presented. However, this assumption would be unacceptable if the flood-frequency discharge at the known location is greater than that estimated by applying the regional equation because the upstream estimate of flood-frequency discharge would be less than that determined using the method presented, thus requiring an assumption of reducing unit inflow. The method presented would require establishing a streamgage station in order to reduce unit inflow when the known flood-frequency discharge is greater than that estimated using the regional equation.
Downstream From a Streamgage StationThis procedure is used when there is a streamgage station
upstream from the ungaged location but none downstream on the same stream. The hydrologic assumption for this
circumstance is that the conditions affecting flood-frequency discharges at the streamgage station change, in the down-stream direction, toward those of the regional tendency. The conditions affecting flood-frequency discharges in the vicinity of the streamgage station could be atypical impervious land cover, unusual basin slope, uncommon basin orientation, or diversion of storm runoff that likely would not significantly affect flood-frequency discharges if the drainage area were larger and, therefore, conditions were more similar to the regional tendency. Mathematically, the value of a flood-fre-quency discharge is changed to that estimated by applying the regional equation as RU/K approaches the downstream limit of the ratio of drainage areas (RDS) (table 6). It is suggested that a streamgage be established when RU/K is greater than or equal to RDS . The flood-frequency discharge is estimated by apply-ing the regional equation when RU/K is greater than or equal to RDS , and the following equation is used to estimate the flood-frequency discharge when RU/K is less than RDS :
QU = QUE + (QK – QKE) (RDS – RU/K) / (RDS – 1) , (8)
when
RU/K < RDS ; and
where QU is the unknown flood-frequency discharge,
in ft3/s; QUE is the regional equation (table 4) evaluated
at the location of the unknown flood-frequency discharge, in ft3/s;
QK is the known flood-frequency discharge (table 3), in ft3/s;
QKE is the regional equation (table 4) evaluated at the location of the known flood-frequency discharge, in ft3/s;
RDS is the downstream limit of the ratio of drainage areas (table 6), unitless; and
RU/K is the ratio of the drainage area at the location of the unknown flood-frequency discharge (AU) to the drainage area at the location of the known flood-frequency discharge (AK), unitless.
Between Streamgage Stations This procedure is used when there are streamgage sta-
tions both upstream and downstream from the ungaged loca-tion on the same stream. The hydrologic assumption for this circumstance is that the conditions affecting flood-frequency discharges are changing on the basis of the relation between the flood-frequency discharges at the streamgage stations, the ratios of the drainage areas, and differences between regional hydrologic conditions and those that affect flood-frequency discharges at the stations. It is suggested that a streamgage be established when RU/K is greater than RDS and less than RUS ,
Procedures For Estimating Flood-Frequency Discharges 19
and when one of the values of the flood-frequency discharge at the upstream and downstream locations is greater than, and one of the values is less than, that estimated by applying the regional equation. Two alternative hydrologic assumptions are described in detail below.
Hydrologic Conditions Change Linearly between Streamgage Stations
This hydrologic assumption is that the conditions affect-ing flood-frequency discharges at the upstream streamgage sta-tion change linearly with drainage area to those at the down-stream location when (1) both streamgage stations are near the ungaged location, or (2) both streamgage stations are not near the ungaged location, but the hydrologic conditions affecting flood-frequency discharges at the stations and ungaged loca-tion are consistent. The conditions affecting flood-frequency discharges between the upstream and downstream locations are well defined by streamgage stations when both are near the ungaged location; the conditions affecting flood-frequency discharges are consistent from the upstream to the downstream location when neither is near the ungaged location and the conditions at both stations are more similar to each other than to the regional hydrologic conditions. Mathematically, the value of flood-frequency discharges changes linearly with respect to drainage area from the upstream to the downstream value when (1) RU/K is less than RDS at the upstream location and RU/K is greater than RUS at the downstream location; or (2) RU/K is greater than or equal to RDS at the upstream location, RU/K is less than or equal to RUS at the downstream location, and the discharges of the flood frequencies at the upstream and downstream locations are both greater than or both less than those estimated by applying the regional equation. The follow-ing equation is used to estimate the flood-frequency discharge under the limitations described above:
QU = [QUS (ADS – AU) + QDS (AU – AUS)] / (ADS – AUS) , (9)
when
RU/K < RDS at upstream location and RU/K > RUS at downstream location,
or when
RU/K ≥ RDS at upstream location and RU/K ≤ RUS at downstream location; and
QKE at the upstream location > QUS and QKE at the downstream location > QDS or
QKE at the upstream location < QUS and QKE at the downstream location < QDS ; and
where QU is the unknown flood-frequency discharge, in
ft3/s; QUS is the flood-frequency discharge at the
upstream location (table 3), in ft3/s; QDS is the flood-frequency discharge at the
downstream location (table 3), in ft3/s; QKE is the regional equation evaluated at the
location of the known flood-frequency discharge, in ft3/s;
AU is the drainage area at the location of the unknown flood-frequency discharge, in mi2;
AUS is the drainage area at the upstream location (table 2), in mi2;
ADS is the drainage area at the downstream location (table 2), in mi2;
RUS is the upstream limit of the ratio of drainage areas (table 5), unitless; and
RDS is the downstream limit of the ratio of drainage areas (table 5), unitless.
Hydrologic Conditions Change Linearly to the Regional Hydrologic Conditions between Streamgage Stations
This hydrologic assumption is that the conditions affect-ing flood-frequency discharges at the streamgage station change linearly with drainage area to those represented by the regional equation when neither streamgage station is near the ungaged location and the hydrologic conditions affecting flood-frequency discharges at the two stations are inconsistent. The conditions affecting flood discharges can vary greatly as a result of factors such as (1) significant changes in land cover, basin topography, or climatic conditions; (2) input from a tributary stream that is hydrologically different from the stream on which the streamgage station is located or from regional hydrologic conditions; or (3) transfer of storm runoff into or out of the basin. Mathematically, the hydrologic condi-tions are inconsistent if one of the flood-frequency discharges at the upstream and downstream locations is greater than and one of the flood-frequency discharges is less than those esti-mated by applying the regional equation—that is, the flood-frequency discharge changes from a value greater than the flood-frequency discharge estimated by applying the regional equation at the upstream location to a value equal to the flood-frequency discharge estimated from the regional equation, and then to a value less than the flood-frequency discharge estimated from the regional equation at the downstream loca-tion, or the reverse. The regional equation (table 4) is applied to estimate the flood-frequency discharge if RU/K is greater than or equal to RDS at the upstream location and RU/K is less than or equal to RUS at the downstream location. Equation 8 presented in the section “Downstream from a Streamgage Station” is used to estimate the flood-frequency discharge if RU/K is less than RDS at the upstream location and RU/K is less than or equal
20 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
to RUS at the downstream location. The following equation is used to estimate the flood-frequency discharge if RU/K is greater than or equal to RDS at the upstream location and RU/K is greater than RUS at the downstream location:
QU = QUE + (QK – QKE) (RU/K – RUS) / (1 – RUS) , (10)
when
RU/K ≥ RDS at upstream location and RU/K > RUS at downstream location, and
where QU is the unknown flood-frequency discharge, in
ft3/s; QUE is the regional equation (table 4) evaluated
at the location of the unknown flood-frequency discharge, in ft3/s;
QK is the known flood-frequency discharge (table 3), in ft3/s;
QKE is the regional equation (table 4) evaluated at the location of the known flood-frequency discharge, in ft3/s;
RDS is the downstream limit of the ratio of drainage areas (table 5), unitless;
RUS is the upstream limit of the ratio of drainage areas (table 5), unitless; and
RU/K is the ratio of the drainage area at the location of the unknown flood-frequency discharge (AU) to the drainage area at the location of the known flood-frequency discharge (AK), unitless.
Not on the Same Stream as a Streamgage Station
This procedure is used when there is no streamgage sta-tion on the same stream as the ungaged location. The hydro-logic assumption for this circumstance is that the conditions affecting flood-frequency discharges are those represented by the regional equation. A streamgage station could be estab-lished when there is no streamgage station on the same stream as the ungaged location. Mathematically, the flood-frequency discharge is estimated by applying the regional equation (table 4).
Example Applications
Estimates of flood-frequency discharges are made by directly reading from table 3 when the location of interest is at a streamgage station, or using one of the four procedures at an ungaged location: (1) when the ungaged location is upstream from a streamgage station, (2) when the ungaged location is downstream from a streamgage station, (3) when the ungaged location is between two streamgage stations on the same
stream, and (4) when the ungaged location is not on the same stream as a streamgage station.
• At a streamgage station: A flood-frequency discharge for a streamgage station is determined by reading the weighted (Qw) value from table 3. For example, the 500-year flood discharge (PK500, 0.2-percent AOP) at the streamgage station Big Coal River at Ash-ford (ID 238 and streamgage 03198500) is given as 50,300 ft3/s.
• Upstream from a streamgage station: The 50-year flood discharge (PK50, 2-percent AOP) for the South Fork South Branch Potomac River just downstream from the confluence of George Run in Pendleton County (Sugar Grove 7½-minute U.S. Geological Survey topographic map) and upstream from the streamgage station at Brandywine (ID 19 and streamgage 01607500) can be calculated using equa-tion 7. The known 50-year flood discharge (QK) at the Brandywine streamgage station is 18,600 ft3/s (the value for Qw from table 3). The drainage area at the unknown location (AU) is 84.56 mi2 (Wiley and oth-ers, 2007, p. 29), and the drainage area at the known location (AK) is 103 mi2 (table 2). The exponent (EX) for the 50-year flood discharge is 0.70 (table 6). RU/K (which equals AU / AK) is calculated to be 0.82, which is greater than the upstream limit of the ratio of drain-age areas, 0.40 (RUS from table 6), indicating that the installation of a streamgage station is not suggested. The 50-year flood discharge of the South Fork South Branch Potomac River just downstream from the con-fluence of George Run is calculated from equation 7 to be 16,200 ft3/s.
• Downstream from a streamgage station: The 2-year flood discharge (PK2, 50-percent AOP) for Sand Run just downstream from the confluence of Laurel Fork in Upshur County (Century 7½-minute U.S. Geologi-cal Survey topographic map) and downstream from the streamgage station near Buckhannon (ID 90 and streamgage 03052500) can be calculated using equa-tion 8. (No other streamgage station is present down-stream from Sand Run near Buckhannon on the same stream.) The known 2-year flood discharge (QK) at the Buckhannon streamgage station is 794 ft3/s (the value for Qw from table 3). The drainage area at the unknown location (AU) is 27.56 mi2 (Stewart and Mathes, 1995, p. 19), and the drainage area at the known location (AK) is 14.3 mi2 (table 2). The result of the regional equation calculation at the unknown location (QUE) is 1,260 ft3/s (Central Mountains Region determined from fig. 4, equation from table 4) and for the known location (QKE) is 708 ft3/s. RU/K (which equals AU / AK) was calculated to be 1.93, which is less than the downstream limit of the ratio of drainage areas, 26.4 (RDS from table 6). The drainage areas are within the
Summary 21
limits of the regional equation from 0.10 to 1,619 mi2 (table 4), indicating that the procedure is valid and that the installation of a streamgage station is not sug-gested. The 2-year flood discharge of Sand Run just downstream from the confluence of Laurel Fork was calculated from equation 8 to be 1,340 ft3/s.
• Between two streamgage stations on the same stream: The 100-year flood discharge (PK100, 1-percent AOP) for the Greenbrier River just down-stream from the confluence of Wolf Creek in Mon-roe County (Alderson 7½-minute U.S. Geological Survey topographic map), downstream from the streamgage station at Alderson (ID 198 and streamgage 03183500), and upstream from the streamgage station at Hilldale (ID 201 and streamgage 03184000) can be calculated using equation 9. The upstream 100-year flood discharge (QUS) at the Alderson streamgage station is 80,400 ft3/s, and the downstream 100-year flood discharge (QDS) at the Hilldale streamgage sta-tion is 85,400 ft3/s (the values for Qw from table 3). The drainage area at the unknown location (AU) is 1,535.79 mi2 (Mathes and others, 1982, p. 55), the upstream drainage area at the Alderson streamgage station (AUS) is 1,364 mi2 (table 2), and the downstream drainage area at the Hilldale gaging station (ADS) is 1,619 mi2. RU/K (which equals AU / AK) at the upstream location was calculated to be 1.13, which is less than the downstream limit of the ratio of drainage areas, 26.4 (RDS from table 6). RU/K at the downstream loca-tion was calculated to be 0.95, which is greater than the upstream limit of the ratio of drainage areas, 0.40 (RUS table 6), indicating that the procedure is valid and that installation of a streamgage is not suggested. The 100-year flood discharge of the Greenbrier River just downstream from the confluence of Wolf Creek was calculated from equation 9 to be 83,800 ft3/s.
• Not on the same stream as a streamgage station: The 10-year flood discharge (PK10, 10-percent AOP) for Fishing Creek just downstream from the confluence of North and South Forks of Fishing Creek in Wetzel County (Pine Grove 7½-minute U.S. Geological Survey topographic map) can be calculated from the regional equation. (There are no streamgage stations on Fishing Creek or South Fork Fishing Creek that could have been on the same stream.) The streams are in the Western Plateaus Region (fig. 4), and the drainage area is 113.92 mi2 (Wiley, 1997, page 30). The drain-age area is within the limits of the regional equation from 0.13 to 1,516 mi2 (table 4), indicating that the procedure is valid, but that installation of a streamgage station could improve the estimate. The 10-year flood discharge was calculated from the regression equa-tion for the Western Plateaus Region (table 4) to be 8,000 ft3/s.
Limitations of Procedures for Estimating Flood-Frequency Discharges
Procedures developed in this study are applicable only to rural, unregulated streams located within the boundaries of West Virginia. Procedures also are limited to the range of drainage areas used to develop the equations—from 0.21 to 1,461 mi2 in the Eastern Panhandle Region, from 0.10 to 1,619 mi2 in the Central Mountains Region, and from 0.13 to 1,516 mi2 in the Western Plateaus Region. The procedures are not meant to be applied to urban areas with paved surfaces, concrete channels, or culverts that substantially increase runoff or decrease infiltration. The procedures are not meant to be applied to streams regulated by dams or with large lakes and ponds that substantially retain runoff. Procedures are not applicable to heavily mined areas if excessive runoff is diverted into or outside the basin, retained along strip benches, or retained underground. Procedures are not applicable to karst areas if excessive runoff is diverted into, outside, or deep within the basin through solution channels or other cavities in carbonate (limestone and dolomite) rocks. Jones (1997) describes the locations of karst areas in eastern coun-ties of West Virginia, including parts of Monongalia, Preston, Barbour, Tucker, Grant, Mineral, Hardy, Hampshire, Morgan, Berkeley, Jefferson, Randolph, Pendleton, Pocahontas, Green-brier, Summers, Monroe, and Mercer (counties are shown in fig. 4).
SummaryFlood-frequency discharges were determined for 290
streamgage stations on rural, unregulated streams in West Virginia and adjacent states that have a minimum of 9 years of record through the 2006 or 2007 water year. This study was conducted by the USGS, in cooperation with the West Virginia Department of Transportation, Division of Highways. West Virginia skew coefficients were used instead of the United States skew coefficients used in previous studies in West Virginia. Flood-frequency discharges and skew coefficients for stations in adjacent states are applicable only for determining estimates in West Virginia and do not supersede values used in the adjacent states.
The results of a correlation analysis of 36 log10-trans-formed basin characteristics available for the 290 streamgage stations reduced the number of characteristics to 32 for con-sideration as independent variables in the regression analy-sis. Elongation ratio (ER), rotundity of basin (RB), channel maintenance (CM), and basin width (BW) were removed from consideration as independent variables because the Pearson’s coefficient was equal to 1 (singularity) for this group of basin characteristics.
Regression analysis was conducted using log10-trans-formed flood-frequency discharges as dependent variables and log10-transformed basin characteristics as independent
22 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
variables for 246 streamflow stations. Forty-four stream-flow stations were excluded from the analysis because the (1) peak data were used to lengthen records for other nearby streamgage stations, (2) station is located in a karst area, (3) plot of the regression residual indicated the station was not representative of West Virginia, and (4) station has a large drainage area and leveraged the regression equation, affecting estimates for small drainage areas. Residuals from multiple and simple least-squares regression models of the 100-year (1-percent AOP) flood discharge with independent variables describing the basin characteristics were used to determine drainage area as the only significant independent variable and to delineate boundaries of three regions in West Virginia—Eastern Panhandle, Central Mountains, and Western Plateaus. Regional equations for the 1.1- (90-percent AOP), 1.5- (67-percent AOP), 2- (50-percent AOP), 5- (20-percent AOP), 10- (10-percent AOP), 25- (4-percent AOP), 50- (2-percent AOP), 100- (1-percent AOP), 200- (0.5-percent AOP), and 500-year (0.2-percent AOP) flood discharges were determined by executing a generalized least-squares regression model. Drainage area was the only significant independent variable determined for all equations in all regions.
The 246 streamgage stations were reduced to 125 for consideration in the trend analysis. For the trend analysis, streamgage stations with a minimum of 30 years of record were considered in order to eliminate effects that might be due to climate variability. Twelve streamgage stations indicated a trend, twice as many as would be expected by chance, but the stations were about equally divided between those having a positive trend and those having a negative trend. No signifi-cance was determined for the streamgage stations having a trend.
The accuracy of estimating equations was quantified by measuring the average prediction error and equivalent years of record. The average prediction error ranged from 21.7 to 56.3 percent, and the equivalent years of record ranged from 2.0 to 70.9 years.
Procedures for estimating flood-frequency discharges at a streamgage station and at an ungaged location are presented in the text of this report. The procedures for an ungaged location include a combination of (1) estimates based on drainage-area ratios between stations and ungaged locations on the same stream and (2) estimates from regional equations. Examples of the procedures are presented in the text.
Equations developed in this study are applicable only to rural, unregulated streams located within the boundaries of West Virginia. Equation application is limited to the range of drainage areas used in equation development—from 0.21 to 1,461 mi2 in the Eastern Panhandle Region, from 0.10 to 1,619 mi2 in the Central Mountains Region, and from 0.13 to 1,516 mi2 in the Western Plateaus Region. The authors suggest using caution in evaluating the results if the equations are applied to heavily mined or karst areas.
References Cited
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Frye, P.M., and Runner, G.S., 1971, A preliminary report on small streams flood frequency in West Virginia: West Vir-ginia Department of Highways design directive, 9 p.
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24 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
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Table 1 25Ta
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd1
0159
5000
Nor
th B
ranc
h Po
tom
ac R
iver
at S
teye
rM
D0.
594
0.33
70.
257
0.37
63.
531
0.24
52
0159
5300
Abr
am C
reek
at O
akm
ont
WV
.523
.348
.175
1.09
33.
127
.193
301
5955
00N
orth
Br.
Poto
mac
Riv
er a
t Kitz
mill
erM
D.5
68.3
44.2
24.9
003.
914
.232
401
5960
00N
orth
Br.
Poto
mac
Riv
er a
t Blo
omin
gton
MD
.549
.351
.198
.466
3.92
4.2
595
0159
6500
Sava
ge R
iver
nea
r Bar
ton
MD
.565
.335
.230
.639
3.19
4.2
236
0159
7000
Cra
btre
e C
reek
nea
r Sw
anto
nM
D.5
43.3
34.2
09.7
222.
714
.267
701
5980
00Sa
vage
Riv
er a
t Blo
omin
gton
MD
.553
.350
.203
.628
3.56
1.2
598
0159
9000
Geo
rges
Cre
ek a
t Fra
nklin
MD
.535
.354
.181
.502
3.28
9.2
349
0159
9500
New
Cre
ek n
ear K
eyse
rW
V.4
75.3
71.1
04.0
603.
013
.302
1001
6000
00N
orth
Bra
nch
Poto
mac
Riv
er a
t Pin
toM
D.5
16.3
66.1
50.5
004.
215
.259
1101
6015
00W
ills C
reek
nea
r Cum
berla
ndM
D.5
95.3
58.2
37.7
923.
817
.255
1201
6030
00N
. Br.
Poto
mac
Riv
er n
ear C
umbe
rland
MD
.529
.365
.164
.697
4.27
0.2
1113
0160
4500
Patte
rson
Cre
ek n
ear H
eads
ville
WV
.430
.383
.047
.017
3.56
5.3
0014
0160
5500
Sout
h B
ranc
h Po
tom
ac R
iver
at F
rank
linW
V.7
00.4
19.2
81.4
503.
681
.341
1501
6057
00R
eeds
Cre
ek T
ribut
ary
near
Fra
nklin
WV
.800
.401
.399
.644
1.32
2.2
2916
0160
6000
N. F
k. S
. Br.
Poto
mac
Riv
er a
t Cab
ins
WV
.824
.389
.435
.874
3.94
2.2
5117
0160
6500
S. B
r. Po
tom
ac R
iver
nea
r Pet
ersb
urg
WV
.802
.396
.406
.719
4.14
9.2
7618
0160
6800
Bru
shy
Run
nea
r Pet
ersb
urg
WV
.689
.415
.274
.551
1.62
2.3
7719
0160
7500
S. F
k. S
. Br.
Poto
mac
R. a
t Bra
ndyw
ine
WV
.659
.433
.226
.816
3.56
0.3
2920
0160
7510
Hea
vene
r Run
nea
r Bra
ndyw
ine
WV
.715
.435
.280
.500
1.51
2.3
0721
0160
8000
S. F
k. S
. Br.
Poto
mac
R. n
ear M
oore
field
WV
.671
.423
.248
.621
3.80
5.3
1122
0160
8100
Will
iam
s Hol
low
nea
r Moo
refie
ldW
V.3
91.4
19-.0
28.1
251.
669
.142
2301
6085
00S.
Br.
Poto
mac
Riv
er n
ear S
prin
gfiel
dW
V.6
91.3
98.2
93.5
984.
385
.295
2401
6090
00To
wn
Cre
ek n
ear O
ldto
wn
MD
.510
.393
.117
.146
3.59
1.2
5525
0160
9500
Saw
pit R
un n
ear O
ldto
wn
MD
.425
.394
.031
.580
2.44
5.1
9326
0160
9650
Littl
e C
acap
on R
iver
at F
renc
hbur
gW
V.3
03.4
14-.1
11.1
983.
034
.360
2701
6098
00Li
ttle
Cac
apon
Riv
er n
ear L
evel
sW
V.3
22.4
06-.0
84.3
243.
593
.223
26 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd28
0161
0000
Poto
mac
Riv
er a
t Paw
Paw
WV
.457
.404
.053
.465
4.63
7.2
1429
0161
0150
Bea
r Cre
ek a
t For
est P
ark
MD
.454
.395
.059
.213
2.58
5.2
8830
0161
0155
Side
ling
Hill
Cre
ek a
t Bel
legr
ove
MD
.481
.399
.082
.169
3.56
9.3
3331
0161
0500
Cac
apon
Riv
er a
t Yel
low
Spr
ing
WV
.242
.446
-.204
.085
3.87
5.3
6232
0161
1500
Cac
apon
Riv
er n
ear G
reat
Cac
apon
WV
.306
.411
-.105
.025
4.11
5.3
1833
0161
2500
Littl
e To
nolo
way
Cre
ek n
ear H
anco
ckM
D.2
46.4
00-.1
54.2
252.
730
.271
3401
6130
00Po
tom
ac R
iver
at H
anco
ckM
D.4
35.4
07.0
28.4
944.
745
.240
3501
6131
50D
itch
Run
nea
r Han
cock
MD
.391
.412
-.021
.322
2.38
7.2
3136
0161
3160
Poto
mac
Riv
er T
ribut
ary
near
Han
cock
MD
.418
.412
.006
.519
2.03
6.1
6637
0161
3900
Hog
ue C
reek
nea
r Hay
field
VA.4
11.4
62-.0
51-.1
302.
925
.348
3801
6140
00B
ack
Cre
ek n
ear J
ones
Spr
ings
WV
.210
.445
-.235
.310
3.76
1.2
5039
0161
5000
Ope
quon
Cre
ek n
ear B
erry
ville
VA.2
52.4
88-.2
36.0
813.
388
.315
4001
6160
00A
bram
s Cre
ek n
ear W
inch
este
rVA
.211
.487
-.276
-.020
2.73
4.2
8141
0161
6500
Ope
quon
Cre
ek n
ear M
artin
sbur
gW
V.2
18.4
70-.2
52.1
573.
659
.307
4201
6170
00Tu
scar
ora
Cre
ek a
bove
Mar
tinsb
urg
WV
.243
.459
-.216
.294
2.23
5.2
5343
0161
7800
Mar
sh R
un a
t Grim
esM
D.3
06.4
81-.1
75.0
232.
012
.339
4401
6180
00Po
tom
ac R
iver
at S
heph
erds
tow
nM
D.3
18.4
90-.1
72.3
224.
837
.224
4501
6194
75D
og C
reek
Trib
utar
y ne
ar L
ocus
t Gro
veM
D.3
22.5
07-.1
85.4
171.
354
.360
4601
6195
00A
ntie
tam
Cre
ek n
ear S
harp
sbur
gM
D.3
63.4
98-.1
35.2
883.
428
.273
4701
6205
00N
orth
Riv
er n
ear S
toke
svill
eVA
.560
.471
.089
.492
2.89
4.3
9848
0162
1000
Dry
Riv
er a
t Raw
ley
Sprin
gsVA
.611
.477
.134
.911
3.39
3.2
7049
0162
1200
War
Bra
nch
near
Hin
ton
VA.5
37.4
90.0
47.4
642.
759
.273
5001
6214
00B
lack
s Run
at H
arris
onbu
rgVA
.453
.506
-.053
.585
2.69
1.1
8651
0162
1450
Bla
cks R
un T
ribut
ary
near
Har
rison
burg
VA.4
62.5
07-.0
45.7
281.
644
.253
5201
6220
00N
orth
Riv
er n
ear B
urke
tow
nVA
.550
.514
.036
.587
3.86
1.2
9153
0162
2100
Nor
th R
iver
Trib
utar
y at
Mou
nt C
raw
ford
VA.4
45.5
13-.0
68.2
431.
778
.278
5401
6223
00B
uffa
lo B
ranc
h Tr
ib. n
ear A
gust
a Sp
rings
VA.3
40.4
89-.1
49.3
201.
733
.165
Table 1 27Ta
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd55
0162
2400
Buf
falo
Bra
nch
Trib
utar
y ne
ar C
hris
tian
VA.3
78.4
92-.1
14.5
111.
760
.260
5601
6320
00N
. Fk.
She
nand
oah
R. a
t Coo
tes S
tore
VA.5
15.4
82.0
33.0
103.
909
.293
5701
6323
00Lo
ng M
eado
w n
ear B
road
way
VA.4
13.4
99-.0
86.3
952.
137
.407
5801
6329
00Sm
ith C
reek
nea
r New
Mar
ket
VA.3
82.4
96-.1
14-.0
103.
328
.373
5901
6329
50C
rook
ed R
un T
ribut
ary
near
Con
icvi
lleVA
.347
.474
-.127
.151
1.36
3.1
9860
0163
2970
Cro
oked
Run
nea
r Mou
nt Ja
ckso
nVA
.343
.482
-.139
.244
2.42
1.3
6361
0163
3000
N. F
k. S
hena
ndoa
h R
. at M
ount
Jack
son
VA.4
39.4
89-.0
50.0
404.
037
.292
6201
6335
00St
ony
Cre
ek a
t Col
umbi
a Fu
rnac
eVA
.336
.475
-.139
.300
3.32
7.2
8663
0163
3650
Pugh
s Run
nea
r Woo
dsto
ckVA
.243
.475
-.232
.224
2.05
9.3
7264
0163
4000
N. F
k. S
hena
ndoa
h R
iver
nea
r Stra
sbur
gVA
.378
.489
-.111
.416
4.07
7.3
1465
0163
4500
Ced
ar C
reek
nea
r Win
ches
ter
VA.1
99.4
76-.2
77.2
053.
524
.340
6601
6365
00Sh
enan
doah
Riv
er a
t Mill
ville
WV
.359
.515
-.156
.154
4.52
4.2
9867
0163
7000
Littl
e C
atoc
tin C
reek
at H
arm
ony
MD
.332
.522
-.190
.344
2.76
6.4
0568
0163
7500
Cat
octin
Cre
ek n
ear M
iddl
etow
nM
D.3
36.5
29-.1
93.1
413.
402
.311
6901
6384
80C
atoc
tin C
reek
at T
aylo
rsto
wn
VA.2
87.5
54-.2
67-.0
703.
584
.364
7001
6385
00Po
tom
ac R
iver
at P
oint
Of R
ocks
MD
.228
.556
-.328
.236
5.01
8.2
2871
0164
3700
Goo
se C
reek
nea
r Mid
dleb
urg
VA.2
47.5
58-.3
11.1
013.
596
.369
7201
6440
00G
oose
Cre
ek n
ear L
eesb
urg
VA.2
68.5
93-.3
25.3
413.
880
.335
7301
6441
00So
uth
Fork
Syc
olin
Cre
ek n
ear L
eesb
urg
VA.2
86.5
79-.2
93.2
282.
599
.282
7402
0095
00C
atta
il R
un n
ear B
olar
VA.3
38.4
16-.0
78.3
851.
512
.101
7502
0114
00Ja
ckso
n R
iver
nea
r Bac
ova
VA.2
38.4
13-.1
75.5
373.
584
.245
7602
0114
60B
ack
Cre
ek n
ear S
unris
eVA
.419
.405
.014
.489
3.46
9.2
2677
0201
1480
Bac
k C
r. at
Rt.
600
near
Mou
ntai
n G
rove
VA.3
44.4
04-.0
60.0
963.
643
.177
7802
0115
00B
ack
Cre
ek n
ear M
ount
ain
Gro
veVA
.258
.407
-.149
-.120
3.77
0.2
0079
0201
2500
Jack
son
Riv
er a
t Fal
ling
Sprin
gVA
.136
.417
-.281
-.260
4.00
3.2
3680
0201
2950
Swee
t Spg
s. C
r. Tr
ib. a
t Sw
eet C
hayl
beat
eVA
.003
.413
-.410
-.140
1.56
2.6
0281
0201
3000
Dun
lap
Cre
ek n
ear C
ovin
gton
VA.0
15.4
17-.4
02.0
683.
725
.254
28 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd82
0201
4000
Potts
Cre
ek n
ear C
ovin
gton
VA.0
01.4
25-.4
24-.1
303.
595
.241
8303
0500
00Ty
gart
Valle
y R
iver
nea
r Dai
ley
WV
.546
.320
.226
.334
3.84
1.1
7084
0305
0500
Tyga
rt Va
lley
Riv
er n
ear E
lkin
sW
V.5
87.3
06.2
81.4
713.
874
.137
8503
0506
50U
nnam
ed R
un a
t Gilm
anW
V.6
08.3
06.3
02.7
581.
700
.284
8603
0510
00Ty
gart
Valle
y R
iver
at B
elin
gton
WV
.579
.284
.295
.291
4.01
6.1
3987
0305
1500
Mid
dle
Fork
Riv
er a
t Mid
vale
WV
.424
.276
.148
.278
3.69
5.1
9988
0305
2000
Mid
dle
Fork
Riv
er a
t Aud
raW
V.4
12.2
65.1
47.2
313.
789
.177
8903
0523
40M
ud L
ick
Run
nea
r Buc
khan
non
WV
.124
.246
-.122
.221
2.19
7.1
9190
0305
2500
Sand
Run
nea
r Buc
khan
non
WV
.274
.265
.009
.356
2.91
6.2
4391
0305
3500
Buc
khan
non
Riv
er a
t Hal
lW
V.2
49.2
57-.0
08-.2
103.
870
.141
9203
0545
00Ty
gart
Valle
y R
iver
at P
hilli
piW
V.4
32.2
51.1
81.2
344.
355
.152
9303
0550
20B
onic
a R
un o
n U
.S. 2
50 n
ear P
hilli
piW
V.3
61.2
60.1
01.0
701.
828
.263
9403
0550
40B
onic
a R
un o
n R
oute
38
near
Phi
llipi
WV
.363
.259
.104
.352
2.33
3.2
7195
0305
6250
Thre
e Fo
rk C
reek
nea
r Gra
fton
WV
.375
.227
.148
.284
3.68
3.1
7696
0305
6500
Tyga
rt Va
lley
Riv
er a
t Fet
term
anW
V.4
21.2
19.2
02.3
284.
498
.155
9703
0566
00R
ight
Fk.
Wic
kwire
Run
nea
r Gra
fton
WV
.319
.225
.094
.104
2.31
0.2
3098
0305
7300
Wes
t For
k R
iver
at W
alke
rsvi
lleW
V.0
86.2
38-.1
52.0
723.
197
.205
9903
0575
00Sk
in C
reek
nea
r Bro
wns
ville
WV
.042
.226
-.184
-.160
3.10
7.1
3010
003
0580
00W
est F
ork
R. b
lw S
tone
wal
l Jac
kson
Dam
nr W
esto
nW
V.0
34.2
18-.1
84.1
263.
507
.172
101
0305
8500
Wes
t For
k R
iver
at B
utch
ervi
lleW
V.0
10.2
05-.1
95-.0
603.
781
.183
102
0305
9000
Wes
t For
k R
iver
at C
lark
sbur
gW
V-.0
24.1
91-.2
15-.3
103.
993
.147
103
0305
9500
Elk
Cre
ek a
t Qui
et D
ell
WV
.135
.206
-.071
.029
3.42
3.2
6210
403
0605
00Sa
lem
For
k at
Sal
emW
V-.0
83.1
65-.2
48-.1
902.
908
.301
105
0306
1000
Wes
t For
k R
iver
at E
nter
pris
eW
V-.0
01.1
78-.1
79-.1
304.
243
.179
106
0306
1500
Buf
falo
Cre
ek a
t Bar
rack
ville
WV
.030
.178
-.148
-.060
3.71
4.1
4810
703
0624
00C
obun
Cre
ek a
t Mor
gant
own
WV
.314
.190
.124
.575
2.70
0.2
7210
803
0625
00D
ecke
rs C
reek
at M
orga
ntow
nW
V.3
65.1
87.1
78.3
633.
195
.256
Table 1 29Ta
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd10
903
0639
50Jo
b R
un n
ear W
ymer
WV
.817
.351
.466
.967
1.83
6.3
1811
003
0650
00D
ry F
ork
at H
endr
icks
WV
.813
.322
.491
.959
4.13
6.2
1111
103
0654
00B
lack
wat
er R
iver
nea
r Dav
isW
V.6
89.3
42.3
47.7
963.
195
.204
112
0306
6000
Bla
ckw
ater
Riv
er a
t Dav
isW
V.6
71.3
37.3
34.7
213.
416
.197
113
0306
7100
Fern
ow W
S-4
near
Hen
dric
ksW
V.6
66.3
16.3
50.3
16.8
46.2
3911
403
0675
00Sh
aver
s For
k at
Che
at B
ridge
WV
.550
.345
.205
.304
3.61
5.1
3811
503
0686
10Ta
ylor
Run
at B
owde
nW
V.7
59.3
34.4
25.4
392.
379
.203
116
0306
8800
Shav
ers F
ork
belo
w B
owde
nW
V.6
82.3
23.3
59.3
554.
043
.172
117
0306
9000
Shav
ers F
ork
at P
arso
nsW
V.7
10.3
11.3
99.8
463.
957
.162
118
0306
9500
Che
at R
iver
nea
r Par
sons
WV
.795
.307
.488
.845
4.42
2.1
8711
903
0698
50Lo
ng R
un n
ear P
arso
nsW
V.5
19.2
80.2
39.5
481.
906
.185
120
0306
9880
Buf
falo
Cre
ek n
ear R
owle
sbur
gW
V.5
01.2
79.2
22.2
103.
032
.206
121
0307
0000
Che
at R
iver
at R
owle
sbur
gW
V.7
47.2
76.4
71.5
964.
541
.189
122
0307
0500
Big
San
dy C
reek
nea
r Roc
kvill
eW
V.4
76.2
30.2
46.7
503.
875
.176
123
0307
1000
Che
at R
iver
nea
r Pis
gah
WV
.617
.219
.398
.280
4.64
4.2
0012
403
0715
00C
heat
Riv
er n
ear M
orga
ntow
nW
V.6
11.1
96.4
15-.0
104.
665
.190
125
0307
2000
Dun
kard
Cre
ek a
t Sha
nnop
inPA
.114
.164
-.050
-.110
3.85
0.1
9912
603
0725
90G
eorg
es C
reek
at S
mith
field
PA.3
94.1
88.2
06.2
902.
826
.197
127
0307
5450
Littl
e You
ghio
ghen
y R
. Trib
. at D
eer P
ark
MD
.555
.316
.239
.099
1.37
0.2
0512
803
0755
00Yo
ughi
oghe
ny R
iver
nea
r Oak
land
MD
.562
.303
.259
.385
3.63
6.2
1012
903
0756
00To
liver
Run
Trib
utar
y ne
ar H
oyes
Run
MD
.548
.294
.254
.579
1.50
1.2
8413
003
0765
05Yo
ughi
oghe
ny R
. Trib
. nea
r Frie
ndsv
ille
MD
.541
.269
.272
.215
1.07
2.1
4313
103
0766
00B
ear C
reek
at F
riend
svill
eM
D.5
60.2
76.2
84.0
573.
192
.205
132
0308
5500
Cha
rtier
s Cre
ek a
t Car
negi
e
PA.1
08.0
57.0
51.1
363.
737
.223
133
0310
8000
Rac
coon
Cre
ek a
t Mof
fatts
Mill
PA.0
55.0
04.0
51.3
563.
568
.220
134
0310
9000
Lisb
on C
reek
at L
isbo
nO
H.0
94-.0
55.1
49.2
842.
592
.237
135
0310
9500
Littl
e B
eave
r Cre
ek n
ear E
ast L
iver
pool
OH
.098
-.022
.120
.160
3.95
8.2
02
30 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd13
603
1100
00Ye
llow
Cre
ek n
ear H
amm
onds
ville
OH
.015
-.025
.040
.391
3.49
7.1
9613
703
1109
80C
onso
l Run
at B
loom
ingd
ale
OH
-.015
-.013
-.002
-.040
.808
.331
138
0311
1150
Bru
sh R
un n
ear B
uffa
loPA
.049
.048
.001
-.110
2.72
1.2
9413
903
1114
50B
rans
on R
un a
t Geo
rget
own
OH
-.034
-.012
-.022
.048
1.76
4.2
9314
003
1114
55So
uth
Fork
Sho
rt C
reek
at G
eorg
etow
nO
H-.0
35-.0
12-.0
23.0
052.
352
.242
141
0311
1470
Littl
e Pi
ney
Fork
at P
arle
ttO
H-.0
19-.0
13-.0
06.1
081.
805
.367
142
0311
1500
Shor
t Cre
ek n
ear D
illon
vale
OH
-.029
.011
-.040
-.130
3.44
8.2
1114
303
1115
40Sl
oan
Run
Trib
utar
y ne
ar H
arris
ville
OH
-.040
-.002
-.038
-.060
1.68
6.5
2014
403
1115
48W
heel
ing
Cre
ek b
elow
Bla
ine
OH
-.045
.016
-.061
.008
3.42
6.2
3914
503
1120
00W
heel
ing
Cre
ek a
t Elm
Gro
veW
V.0
05.0
36-.0
31-.0
403.
955
.205
146
0311
3700
Littl
e G
rave
Cre
ek n
ear G
lend
ale
WV
-.036
.042
-.078
-.070
2.69
3.3
3314
703
1140
00C
aptin
a C
reek
at A
rmst
rong
s Mill
sO
H-.0
66.0
23-.0
89.0
003.
785
.216
148
0311
4240
Woo
d R
un n
ear W
oods
field
OH
-.081
.026
-.107
-.130
1.80
5.3
7714
903
1145
00M
iddl
e Is
land
Cre
ek a
t Litt
leW
V-.1
05.0
79-.1
84.0
904.
132
.132
150
0311
4550
Buf
falo
Run
nea
r Frie
ndly
WV
-.109
.071
-.180
-.250
2.30
7.3
0615
103
1146
00Li
ttle
Buf
falo
Run
nea
r Frie
ndly
WV
-.109
.073
-.182
-.190
2.40
1.2
5815
203
1146
50B
uffa
lo R
un n
ear L
ittle
WV
-.110
.076
-.186
-.340
2.90
5.2
8615
303
1152
80Tr
ail R
un n
ear A
ntio
chO
H-.0
99.0
51-.1
50.2
182.
814
.218
154
0311
5400
Littl
e M
uski
ngum
Riv
er a
t Blo
omfie
ldO
H-.0
91.0
41-.1
32.4
813.
890
.230
155
0311
5410
Gra
ham
Run
nea
r Blo
omfie
ldO
H-.0
99.0
42-.1
41-.2
601.
282
.383
156
0311
5500
Littl
e M
uski
ngum
Riv
er a
t Fay
OH
-.093
.042
-.135
-.010
3.88
6.1
9415
703
1155
10M
oss R
un n
ear W
ingo
ttO
H-.0
95.0
39-.1
34.1
962.
359
.253
158
0311
5600
Bar
ns R
un n
ear S
umm
erfie
ldO
H-.0
59-.0
07-.0
52.0
452.
737
.357
159
0311
5710
Buf
falo
Run
Trib
utar
y ne
ar D
exte
r City
OH
-.057
-.002
-.055
.252
1.64
6.0
8616
003
1506
00Tu
pper
Cre
ek a
t Dev
ola
OH
-.057
.020
-.077
.173
2.15
3.2
3916
103
1514
00Li
ttle
Kan
awha
Riv
er n
ear W
ildca
tW
V.1
81.2
47-.0
66.4
503.
708
.243
162
0315
1500
Littl
e K
anaw
ha R
iver
nea
r Bur
nsvi
lleW
V.1
44.2
27-.0
83-.1
703.
712
.135
Table 1 31Ta
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd16
303
1520
00Li
ttle
Kan
awha
Riv
er a
t Gle
nvill
eW
V.0
14.1
81-.1
67-.0
103.
986
.149
164
0315
2200
Buc
k R
un n
ear L
eopo
ldW
V-.1
28.1
71-.2
99.0
212.
537
.247
165
0315
2500
Lead
ing
Cre
ek n
ear G
lenv
ille
WV
-.130
.173
-.303
-.300
3.78
3.1
9416
603
1530
00St
eer C
reek
nea
r Gra
ntsv
ille
WV
-.063
.166
-.229
-.260
3.83
8.1
8016
703
1535
00Li
ttle
Kan
awha
Riv
er a
t Gra
ntsv
ille
WV
-.075
.147
-.222
-.270
4.30
1.1
1916
803
1540
00W
. Fk.
Litt
le K
anaw
ha R
iver
at R
ocks
dale
WV
-.097
.141
-.238
-.150
3.88
7.1
7516
903
1542
50Ta
nner
Run
at S
penc
erW
V-.1
18.1
27-.2
45-.0
802.
824
.204
170
0315
4500
Ree
dy C
reek
nea
r Ree
dyW
V-.1
18.0
98-.2
16.0
863.
548
.146
171
0315
5000
Littl
e K
anaw
ha R
iver
at P
ales
tine
WV
-.112
.084
-.196
-.210
4.46
6.1
4117
203
1552
00So
uth
Fork
Hug
hes R
iver
at M
acfa
rlan
WV
-.149
.111
-.260
-.290
3.91
1.1
1917
303
1554
50B
ig Is
land
Run
nea
r Eliz
abet
hW
V-.1
38.0
99-.2
37-.2
402.
865
.246
174
0315
5500
Hug
hes R
iver
at C
isco
WV
-.146
.092
-.238
-.130
4.16
0.1
6417
503
1555
25G
oose
Cre
ek n
ear P
etro
leum
WV
-.130
.086
-.216
.084
3.27
4.2
3117
603
1595
40Sh
ade
Riv
er n
ear C
hest
erO
H.0
51.0
11.0
40.5
653.
579
.182
177
0315
9700
Gra
sslic
k R
un n
ear R
iple
yW
V-.0
77.0
86-.1
63.2
702.
191
.239
178
0317
1500
New
Riv
er a
t Egg
lest
onVA
.370
.412
-.042
.674
4.54
3.2
4617
903
1730
00W
alke
r Cre
ek a
t Ban
eVA
.034
.404
-.370
.005
3.83
3.2
2118
003
1755
00W
olf C
reek
nea
r Nar
row
sVA
-.038
.385
-.423
-.420
3.72
2.2
2818
103
1764
00R
ich
Cre
ek n
ear P
eter
stow
nW
V-.0
44.3
81-.4
25-.1
603.
162
.147
182
0317
6500
New
Riv
er a
t Gle
n Ly
nVA
.307
.378
-.071
.584
4.60
8.2
4418
303
1775
00In
dian
Cre
ek a
t Ind
ian
Mill
sW
V-.0
39.3
66-.4
05-.2
903.
593
.084
184
0317
7700
Blu
esto
ne R
iver
at B
luefi
eld
VA-.0
90.3
43-.4
33-.0
702.
851
.146
185
0317
8500
Cam
p C
reek
nea
r Cam
p C
reek
WV
-.153
.335
-.488
-.240
3.15
3.2
6718
603
1790
00B
lues
tone
Riv
er n
ear P
ipes
tem
WV
-.139
.344
-.483
-.460
3.90
1.2
1718
703
1795
00B
lues
tone
Riv
er a
t Lill
yW
V-.1
40.3
45-.4
85-.1
703.
944
.152
188
0318
0000
New
Riv
er a
t Blu
esto
ne D
amW
V.2
05.3
47-.1
42.5
674.
693
.213
189
0318
0350
W. F
k. G
reen
brie
r Riv
er T
rib. a
t Dur
bin
WV
.635
.357
.278
.553
1.74
1.1
91
32 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd19
003
1805
00G
reen
brie
r Riv
er a
t Dur
bin
WV
.728
.359
.369
1.06
83.
687
.210
191
0318
0530
Bru
sh R
un n
ear B
arto
wW
V.6
46.3
70.2
76.3
801.
862
.330
192
0318
0680
Coo
per R
un n
ear G
reen
Ban
kW
V.4
88.3
78.1
10.2
591.
992
.266
193
0318
1900
Mac
k B
utte
rbal
l Hol
low
nea
r Hun
ters
ville
WV
.231
.376
-.145
.043
1.01
9.1
5319
403
1820
00K
napp
Cre
ek a
t Mar
linto
nW
V.1
79.3
67-.1
88.7
283.
708
.163
195
0318
2500
Gre
enbr
ier R
iver
at B
ucke
yeW
V.4
39.3
64.0
75.4
604.
273
.181
196
0318
2700
Ant
hony
Cre
ek n
ear A
ntho
nyW
V.0
49.3
81-.3
32.5
243.
980
.165
197
0318
3000
Seco
nd C
reek
nea
r Sec
ond
Cre
ekW
V-.0
10.3
88-.3
98.0
173.
409
.232
198
0318
3500
Gre
enbr
ier R
iver
at A
lder
son
WV
.110
.364
-.254
-.140
4.52
7.1
6919
903
1835
50G
riffit
h C
reek
nea
r Ald
erso
nW
V-.0
29.3
56-.3
85-.2
702.
441
.130
200
0318
3570
Bug
gar L
ick
at P
ence
Spr
ings
WV
-.041
.361
-.402
.119
2.11
8.2
9620
103
1840
00G
reen
brie
r Riv
er a
t Hill
dale
WV
.090
.356
-.266
.127
4.56
8.1
4820
203
1842
00B
ig C
reek
nea
r Bel
lepo
int
WV
-.058
.352
-.410
.077
2.78
2.3
6120
303
1845
00N
ew R
iver
at H
into
nW
V.0
13.3
44-.3
31.2
064.
898
.212
204
0318
5000
Pine
y C
reek
at R
alei
ghW
V-.1
47.3
05-.4
52.0
703.
091
.235
205
0318
5020
Littl
e B
eave
r Cr.
Trib
. nea
r Sha
dy S
prin
gsW
V-.1
21.3
16-.4
37-.3
101.
472
.328
206
0318
5500
New
Riv
er a
t Cap
erto
nW
V-.0
15.2
93-.3
08-.0
904.
957
.189
207
0318
6000
New
Riv
er a
t Fay
ette
WV
-.016
.281
-.297
-.160
4.97
5.2
1020
803
1865
00W
illia
ms R
iver
at D
yer
WV
.289
.301
-.012
.379
3.91
4.1
8820
903
1870
00G
aule
y R
iver
at C
amde
n on
Gau
ley
WV
.295
.289
.006
.254
4.05
7.1
9121
003
1873
00N
orth
Fk.
Cra
nber
ry R
iver
nea
r Hill
sbor
oW
V.2
44.3
34-.0
90.3
432.
911
.233
211
0318
7500
Cra
nber
ry R
iver
nea
r Ric
hwoo
dW
V.2
38.3
07-.0
69.3
113.
695
.189
212
0318
9000
Che
rry
Riv
er a
t Fen
wic
kW
V.1
75.3
10-.1
35.6
563.
944
.204
213
0318
9100
Gau
ley
Riv
er n
ear C
raig
svill
eW
V.2
43.2
95-.0
52.1
134.
415
.195
214
0318
9500
Gau
ley
Riv
er n
ear S
umm
ersv
ille
WV
.234
.279
-.045
.514
4.39
7.1
7221
503
1896
50C
ollis
on C
reek
nea
r Nal
len
WV
.090
.287
-.197
-.110
2.23
4.2
3121
603
1900
00M
eado
w R
iver
at N
alle
nW
V.0
50.2
96-.2
46.0
363.
779
.149
Table 1 33Ta
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd21
703
1901
00A
nglin
s Cre
ek n
ear N
alle
nW
V.0
93.2
96-.2
03.2
153.
231
.372
218
0319
0400
Mea
dow
Riv
er n
ear M
ount
Loo
kout
WV
.056
.277
-.221
.276
3.95
8.1
8721
903
1905
00M
eado
w C
reek
nea
r Sum
mer
svill
eW
V.0
78.2
73-.1
95-.1
702.
506
.155
220
0319
1400
Laur
el C
reek
nea
r Sum
mer
svill
eW
V.0
64.2
62-.1
98.0
852.
379
.348
221
0319
1500
Pete
rs C
reek
nea
r Loc
kwoo
dW
V.0
78.2
58-.1
80.1
123.
420
.279
222
0319
2000
Gau
ley
Riv
er a
bove
Bel
vaW
V.1
64.2
42-.0
78.3
194.
624
.158
223
0319
2500
Gau
ley
Riv
er a
t Bel
vaW
V.1
59.2
42-.0
83.2
514.
576
.198
224
0319
3000
Kan
awha
Riv
er a
t Kan
awha
Fal
lsW
V-.0
60.2
53-.3
13-.0
705.
089
.178
225
0319
3725
Littl
e Fo
rk a
t Mos
syW
V-.0
80.2
69-.3
49.1
041.
267
.203
226
0319
3830
Gilm
er R
un n
ear M
arlin
ton
WV
.304
.351
-.047
.621
2.39
3.2
7322
703
1947
00El
k R
iver
bel
ow W
ebst
er S
prin
gsW
V.3
82.2
70.1
12.5
004.
082
.179
228
0319
5000
Elk
Riv
er a
t Cen
tralia
WV
.376
.260
.116
.143
4.04
9.1
0122
903
1951
00R
ight
For
k H
olly
Riv
er a
t Gua
rdia
nW
V.2
74.2
68.0
06.4
783.
395
.187
230
0319
5250
Left
Fork
Hol
ly R
iver
nea
r Rep
lete
WV
.276
.265
.011
.388
3.40
3.1
8723
103
1955
00El
k R
iver
at S
utto
nW
V.3
07.2
35.0
72.2
874.
299
.159
232
0319
5600
Gra
nny
Cre
ek a
t Sut
ton
WV
.062
.233
-.171
.199
2.96
1.1
5923
303
1970
00El
k R
iver
at Q
ueen
Sho
als
WV
.176
.191
-.015
.418
4.44
6.1
5423
403
1971
50A
shle
ycam
p R
un n
ear L
eft H
and
WV
-.080
.174
-.254
.029
2.34
7.1
7523
503
1979
00El
k Tw
omile
Cre
ek T
rib. n
ear C
harle
ston
WV
-.077
.179
-.256
.060
1.84
0.2
5123
603
1983
50C
lear
For
k at
Whi
tesv
ille
WV
-.119
.241
-.360
.096
3.33
2.3
9123
703
1984
50D
raw
dy C
reek
nea
r Pey
tona
WV
-.110
.196
-.306
.263
2.57
1.2
7523
803
1985
00B
ig C
oal R
iver
at A
shfo
rdW
V-.1
29.1
84-.3
13.0
884.
021
.232
239
0319
8780
Hun
ters
Bra
nch
near
Mad
ison
WV
-.133
.201
-.334
-.120
2.08
1.2
5624
003
1988
00Lo
w G
ap C
reek
nea
r Mad
ison
WV
-.126
.195
-.321
-.230
1.86
4.4
3624
103
1990
00Li
ttle
Coa
l Riv
er a
t Dan
ville
WV
-.159
.186
-.345
-.070
3.96
5.2
7324
203
1993
00R
ock
Cre
ek n
ear D
anvi
lleW
V-.1
13.1
83-.2
96-.2
602.
622
.305
243
0319
9400
Littl
e C
oal R
iver
at J
ulia
nW
V-.1
50.1
71-.3
21.1
054.
006
.241
34 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd24
403
2005
00C
oal R
iver
at T
orna
doW
V-.1
33.1
40-.2
73-.2
904.
300
.174
245
0320
0600
Littl
e Sc
ary
Cre
ek n
ear N
itro
WV
-.058
.118
-.176
.049
1.92
6.2
2824
603
2010
00Po
cata
lico
Riv
er a
t Sis
sonv
ille
WV
-.099
.135
-.234
-.140
3.82
6.1
8924
703
2014
05H
urric
ane
Cre
ek a
t Hur
rican
eW
V-.0
35.0
99-.1
34-.1
803.
317
.183
248
0320
1410
Popl
ar F
ork
at T
eays
WV
-.045
.108
-.153
-.040
2.95
5.1
7924
903
2014
20Lo
ng B
ranc
h ne
ar T
eays
WV
-.040
.103
-.143
-.300
2.40
6.1
5525
003
2014
40Si
xtee
nmile
Cre
ek n
ear P
liny
WV
.007
.058
-.051
.302
2.49
0.2
2925
103
2014
80Th
reem
ile C
reek
Trib
. nea
r Poi
nt P
leas
ant
WV
.047
.019
.028
-.220
2.11
1.3
2325
203
2020
00R
acco
on C
reek
at A
dam
svill
eO
H.2
00-.0
17.2
17.3
083.
790
.191
253
0320
2245
Mar
sh F
ork
at M
aben
WV
-.202
.290
-.492
.171
2.66
7.2
3925
403
2024
00G
uyan
dotte
Riv
er n
ear B
aile
ysvi
lleW
V-.2
01.2
65-.4
66-.0
303.
911
.343
255
0320
2480
Brie
r Cre
ek a
t Fan
rock
WV
-.225
.268
-.493
-.310
2.54
1.3
6525
603
2027
50C
lear
For
k at
Cle
ar F
ork
WV
-.216
.255
-.471
.042
3.63
8.2
0025
703
2030
00G
uyan
dotte
Riv
er a
t Man
WV
-.227
.223
-.450
-.340
4.29
4.2
1725
803
2036
00G
uyan
dotte
Riv
er a
t Log
anW
V-.2
28.2
00-.4
28-.4
004.
380
.252
259
0320
4000
Guy
ando
tte R
iver
at B
ranc
hlan
dW
V-.2
15.1
07-.3
22-.4
804.
345
.201
260
0320
4500
Mud
Riv
er n
ear M
ilton
WV
-.052
.093
-.145
.250
3.80
8.2
2926
103
2059
95Sa
ndus
ky C
reek
nea
r Bur
lingt
onO
H.1
63.0
30.1
33.3
352.
066
.217
262
0320
6450
Four
pole
Cre
ek n
ear H
untin
gton
WV
.091
.055
.036
-.100
2.82
6.3
3726
303
2066
00Ea
st F
ork
Twel
vepo
le C
reek
nea
r Dun
low
WV
-.050
.124
-.174
-.160
3.24
4.1
9526
403
2068
00E.
Fk.
Tw
elve
pole
Cre
ek n
ear E
ast L
ynn
WV
-.017
.088
-.105
.199
3.53
6.1
8326
503
2070
00Tw
elve
pole
Cre
ek a
t Way
neW
V.0
05.0
68-.0
63.0
003.
811
.228
266
0320
7020
Twel
vepo
le C
reek
bel
ow W
ayne
WV
.008
.066
-.058
-.020
3.81
0.2
2426
703
2074
00Pr
ater
Cre
ek a
t Vas
ant
VA-.1
06.2
51-.3
57-.1
902.
922
.448
268
0320
7500
Levi
sa F
ork
near
Gru
ndy
VA-.1
31.2
38-.3
69-.3
903.
955
.277
269
0320
7800
Levi
sa F
ork
at B
ig R
ock
VA-.1
33.2
21-.3
54.0
003.
946
.323
270
0320
7962
Dic
ks F
ork
at P
hylli
sK
Y-.0
69.1
87-.2
56-.1
801.
796
.369
Table 1 35Ta
ble
1.
Iden
tifica
tion
num
bers
, sta
tion
num
bers
, stre
amga
ge-s
tatio
n na
mes
, and
ske
w c
oeffi
cien
ts a
nd s
tatis
tics
for t
he 2
90 U
.S. G
eolo
gica
l Sur
vey
stre
amga
ge s
tatio
ns o
n ru
ral,
unre
gula
ted
stre
ams
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; W.,
Wes
t; R
., R
ight
; Br.,
B
ranc
h; F
k., F
ork;
Cr.,
Cre
ek; T
rib.,
Trib
utar
y; S
pgs.,
Spr
ings
; Rt.,
Rou
te; b
l, be
low
; nr,
near
; U.S
. ske
w, U
nite
d St
ates
skew
, the
skew
pre
sent
ed in
Bul
letin
-17B
by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2); W
V sk
ew, W
est V
irgin
ia sk
ew d
eter
min
ed b
y A
tkin
s and
oth
ers (
2009
); sh
adin
g in
dica
tes t
he 4
4 st
ream
gage
stat
ions
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stre
amga
ge-s
tatio
n na
me
Stat
eW
V sk
ew,
unitl
ess
U.S
. ske
w,
unitl
ess
Diff
eren
ce
betw
een
WV
and
US
skew
s,
unitl
ess
Wei
ghte
d W
V an
d st
atio
n sk
ews,
un
itles
s
Mea
n of
log 10
-tr
ansf
orm
ed
flood
-fre
quen
cy
disc
harg
es,
in c
ubic
feet
per
se
cond
Stan
dard
de
viat
ion
of lo
g 10-
tran
sfor
med
flo
od-f
requ
ency
di
scha
rges
, in
cub
ic fe
et p
er
seco
nd27
103
2080
00Le
visa
For
k be
low
Fis
htra
p D
amK
Y-.1
31.1
78-.3
09-.1
304.
076
.216
272
0320
8500
Rus
sel F
ork
at H
aysi
VA-.0
58.2
23-.2
81-.2
404.
099
.295
273
0320
8950
Cra
nes N
est R
iver
nea
r Clin
twoo
dVA
.034
.213
-.179
.189
3.40
2.3
0527
403
2090
00Po
nd R
. blw
. Fla
nnag
an D
am n
ear H
aysi
VA.0
27.2
13-.1
86-.1
003.
970
.236
275
0320
9575
Bill
D. B
ranc
h ne
ar K
iteK
Y.1
32.1
31.0
01.4
302.
464
.203
276
0321
0000
John
s Cre
k ne
ar M
eta
KY
-.064
.153
-.217
-.420
3.39
6.2
4727
703
2115
00Jo
hns C
reek
nea
r Van
Lea
rK
Y.0
03.0
85-.0
82-.1
103.
627
.227
278
0321
2000
Pain
t Cre
ek a
t Sta
fford
svill
eK
Y.2
98.0
47.2
51-.1
703.
706
.303
279
0321
2750
Tug
Fork
at W
elch
WV
-.183
.287
-.470
-.060
3.49
0.3
3628
003
2129
80D
ry F
ork
at B
earto
wn
WV
-.154
.269
-.423
-.310
3.71
8.2
5228
103
2130
00Tu
g Fo
rk a
t Litw
arW
V-.1
83.2
55-.4
38-.2
504.
081
.261
282
0321
3500
Pant
her C
reek
nea
r Pan
ther
WV
-.177
.256
-.433
-.150
3.20
5.3
8528
303
2137
00Tu
g Fo
rk a
t Will
iam
son
WV
-.191
.169
-.360
.043
4.24
2.2
6828
403
2140
00Tu
g Fo
rk n
ear K
erm
itW
V-.1
86.1
33-.3
19-.0
504.
380
.281
285
0321
4500
Tug
Fork
at K
erm
itW
V-.1
80.1
27-.3
07-.1
304.
366
.268
286
0321
4900
Tug
Fork
at G
lenh
ayes
WV
-.165
.087
-.252
-.040
4.27
5.2
4128
703
2155
00B
lain
e C
reek
at Y
ates
ville
KY
.268
.039
.229
.116
3.78
4.2
1928
803
2165
00Li
ttle
Sand
y R
iver
at G
rays
onK
Y.3
70-.0
24.3
94.2
704.
007
.178
289
0321
6540
E. F
k. L
ittle
San
dy R
iver
nea
r Fal
lsbu
rgK
Y.2
58.0
24.2
34.2
492.
975
.168
290
0321
6563
Mile
Bra
nch
near
Rus
hK
Y.2
86-.0
06.2
92.0
882.
280
.185
36 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
2.
Floo
d-fre
quen
cy s
tatis
tics
and
drai
nage
are
as fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t st
ates
.—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
- -,
no v
alue
; sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eD
rain
age
area
, in
squ
are
mile
s
Wat
er y
ears
bo
undi
ng
syst
emat
ic
peak
s
Num
ber o
f yea
rs o
f re
cord
Ove
rrid
e of
out
lier t
hres
hold
sN
umbe
r of p
eaks
Tren
d an
alys
is
Syst
emat
icH
isto
ric
Hig
h th
resh
old
disc
harg
e, in
cu
bic
feet
per
se
cond
Low
thre
shol
d di
scha
rge,
in
cubi
c fe
et p
er
seco
nd
Hig
h ou
tlier
Low
ou
tlier
Kend
all’s
ta
uSi
gnifi
canc
e
leve
l
101
5950
00M
D73
.119
55–2
006
52--
----
----
-0.1
300.
175
201
5953
00W
V42
.619
55–1
982
2783
----
1--
-.239
.083
301
5955
00M
D22
519
50–2
006
56--
----
1--
.071
.445
401
5960
00M
D28
719
24–1
950
25--
----
----
-.093
.528
501
5965
00M
D49
.119
49–2
006
58--
----
1--
-.056
.537
601
5970
00M
D16
.719
49–1
981
33--
----
1--
-.030
.816
701
5980
00M
D11
519
25–1
950
24--
----
----
-.007
.980
801
5990
00M
D72
.419
31–2
007
77--
----
----
-.081
.301
901
5995
00W
V46
.519
48–1
969
21--
----
----
-.100
.546
1001
6000
00M
D59
819
36–1
950
15--
----
----
-.495
.012
1101
6015
00M
D24
719
30–2
006
77--
----
2--
.107
.169
1201
6030
00M
D87
719
30–1
981
52--
----
1--
-.088
.360
1301
6045
00W
V22
119
39–2
007
69--
----
----
-.231
.005
1401
6055
00W
V17
919
36–2
007
6113
0--
----
--.1
04.2
3715
0160
5700
WV
0.23
1965
–197
713
----
----
--.4
62.0
3316
0160
6000
WV
310
1940
–200
750
130
----
1--
.065
.509
1701
6065
00W
V65
119
24–2
007
8013
0--
--3
--.0
75.3
2518
0160
6800
WV
1.56
1965
–197
713
----
----
--.3
08.1
6119
0160
7500
WV
103
1944
–200
764
130
----
2--
-.187
.030
2001
6075
10W
V1.
0419
99–2
007
9--
----
----
-.143
.711
2101
6080
00W
V27
719
24–2
007
7813
0--
--1
---.0
92.2
3522
0160
8100
WV
0.21
1965
–197
713
----
----
--.5
13.0
1723
0160
8500
WV
1,46
119
00–2
007
8413
0--
--3
--.0
46.5
3624
0160
9000
MD
148
1928
–200
526
----
----
---.0
52.7
2425
0160
9500
MD
5.08
1948
–197
625
----
----
1.0
33.8
3326
0160
9650
WV
28.9
1999
–200
79
----
----
--.0
001.
000
2701
6098
00W
V10
819
67–1
977
11--
----
----
.309
.213
2801
6100
00W
V3,
114
1939
–200
668
----
--1
----
--29
0161
0150
MD
10.4
1965
–198
318
----
----
--.0
46.8
20
Table 2 37Ta
ble
2.
Floo
d-fre
quen
cy s
tatis
tics
and
drai
nage
are
as fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t st
ates
.—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
- -,
no v
alue
; sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eD
rain
age
area
, in
squ
are
mile
s
Wat
er y
ears
bo
undi
ng
syst
emat
ic
peak
s
Num
ber o
f yea
rs o
f re
cord
Ove
rrid
e of
out
lier t
hres
hold
sN
umbe
r of p
eaks
Tren
d an
alys
is
Syst
emat
icH
isto
ric
Hig
h th
resh
old
disc
harg
e, in
cu
bic
feet
per
se
cond
Low
thre
shol
d di
scha
rge,
in
cubi
c fe
et p
er
seco
nd
Hig
h ou
tlier
Low
ou
tlier
Kend
all’s
ta
uSi
gnifi
canc
e
leve
l
3001
6101
55M
D10
219
68–2
006
18--
----
----
-.033
.880
3101
6105
00W
V30
619
36–1
951
1467
36,0
00--
1--
-.143
.511
3201
6115
00W
V67
519
23–2
007
8411
9--
--1
---.0
18.8
0833
0161
2500
MD
16.9
1948
–196
417
----
----
---.0
15.9
6734
0161
3000
MD
4,07
519
29–2
006
75--
----
1--
----
3501
6131
50M
D4.
8019
65–1
986
22--
----
----
-.013
.955
3601
6131
60M
D1.
2019
65–1
976
12--
----
1--
.089
.788
3701
6139
00VA
15.9
1961
–200
646
----
----
1.0
48.6
4338
0161
4000
WV
235
1929
–200
751
----
----
1.0
36.7
1539
0161
5000
VA58
.219
44–2
006
58--
----
----
.194
.032
4001
6160
00VA
17.0
1950
–199
427
----
----
--.3
96.0
0441
0161
6500
WV
273
1948
–200
760
----
----
--.1
70.0
5642
0161
7000
WV
11.3
1949
–200
726
----
----
1--
--43
0161
7800
MD
18.9
1964
–200
743
----
----
----
--44
0161
8000
MD
5,95
019
29–2
004
69--
----
--1
----
4501
6194
75M
D0.
1019
66–1
976
11--
----
----
----
4601
6195
00M
D28
119
28–2
007
80--
----
--1
----
4701
6205
00VA
17.3
1947
–200
660
----
----
----
--48
0162
1000
VA73
.019
43–1
986
3155
----
1--
-.077
.552
4901
6212
00VA
9.73
1949
–197
628
----
----
--.0
63.6
6150
0162
1400
VA5.
4419
49–1
961
1340
----
1--
-.282
.200
5101
6214
50VA
0.67
1966
–197
510
25--
--1
--.1
56.5
9252
0162
2000
VA37
519
27–2
006
7714
6--
--5
---.0
80.3
0553
0162
2100
VA1.
5619
66–1
975
10--
----
----
.511
.049
5401
6223
00VA
0.54
1967
–197
610
----
----
----
--55
0162
2400
VA0.
4619
67–2
000
32--
----
----
----
5601
6320
00VA
210
1926
–200
681
172
----
12--
.085
.262
5701
6323
00VA
7.94
1950
–197
725
----
--1
--.0
51.7
4758
0163
2900
VA93
.619
61–2
006
45--
----
----
.043
.681
38 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
2.
Floo
d-fre
quen
cy s
tatis
tics
and
drai
nage
are
as fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t st
ates
.—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
- -,
no v
alue
; sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eD
rain
age
area
, in
squ
are
mile
s
Wat
er y
ears
bo
undi
ng
syst
emat
ic
peak
s
Num
ber o
f yea
rs o
f re
cord
Ove
rrid
e of
out
lier t
hres
hold
sN
umbe
r of p
eaks
Tren
d an
alys
is
Syst
emat
icH
isto
ric
Hig
h th
resh
old
disc
harg
e, in
cu
bic
feet
per
se
cond
Low
thre
shol
d di
scha
rge,
in
cubi
c fe
et p
er
seco
nd
Hig
h ou
tlier
Low
ou
tlier
Kend
all’s
ta
uSi
gnifi
canc
e
leve
l
5901
6329
50VA
0.34
1966
–197
510
----
----
--.5
33.0
3960
0163
2970
VA6.
6019
72–2
006
35--
----
----
-.166
.173
6101
6330
00VA
508
1944
–200
662
172
----
1--
.124
.157
6201
6335
00VA
77.5
1947
–197
630
69--
----
--.0
74.5
8663
0163
3650
VA3.
4319
71–2
006
36--
----
1--
-.178
.130
6401
6340
00VA
770
1926
–200
680
138
----
1--
.053
.488
6501
6345
00VA
102
1938
–200
669
----
----
1.2
11.0
1066
0163
6500
WV
3,04
118
96–2
007
9013
8--
--4
----
--67
0163
7000
MD
8.83
1948
–197
629
----
----
----
--68
0163
7500
MD
66.9
1948
–200
659
----
----
----
--69
0163
8480
VA89
.619
71–2
006
36--
----
----
----
7001
6385
00M
D9,
651
1895
–200
711
3--
----
----
----
7101
6437
00VA
122
1966
–200
634
----
----
---.0
16.9
0672
0164
4000
VA33
219
10–2
006
7911
9--
--2
--.0
96.2
1373
0164
4100
VA2.
0619
66–1
977
12--
----
----
----
7402
0095
00VA
0.68
1966
–197
510
----
----
1--
--75
0201
1400
VA15
719
72–2
006
3491
----
1--
----
7602
0114
60VA
60.9
1975
–200
632
91--
--1
----
--77
0201
1480
VA88
.619
74–1
984
11--
----
----
-.345
.161
7802
0115
00VA
134
1951
–198
434
----
----
--.1
05.3
8979
0201
2500
VA41
019
25–1
979
5575
----
--1
.238
.010
8002
0129
50VA
0.86
1966
–199
526
----
----
---.2
17.2
5981
0201
3000
VA16
219
29–2
006
78--
----
----
.104
.180
8202
0140
00VA
153
1929
–200
668
----
----
1.1
14.1
7283
0305
0000
WV
185
1916
–200
780
----
----
--.1
66.0
3084
0305
0500
WV
271
1945
–200
460
120
----
1--
.112
.209
8503
0506
50W
V0.
4619
64–2
006
22--
----
11
-.104
.516
8603
0510
00W
V40
619
08–2
007
100
120
----
2--
.044
.516
8703
0515
00W
V12
219
16–1
942
2712
0--
----
--.1
57.2
60
Table 2 39Ta
ble
2.
Floo
d-fre
quen
cy s
tatis
tics
and
drai
nage
are
as fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t st
ates
.—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
- -,
no v
alue
; sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eD
rain
age
area
, in
squ
are
mile
s
Wat
er y
ears
bo
undi
ng
syst
emat
ic
peak
s
Num
ber o
f yea
rs o
f re
cord
Ove
rrid
e of
out
lier t
hres
hold
sN
umbe
r of p
eaks
Tren
d an
alys
is
Syst
emat
icH
isto
ric
Hig
h th
resh
old
disc
harg
e, in
cu
bic
feet
per
se
cond
Low
thre
shol
d di
scha
rge,
in
cubi
c fe
et p
er
seco
nd
Hig
h ou
tlier
Low
ou
tlier
Kend
all’s
ta
uSi
gnifi
canc
e
leve
l
8803
0520
00W
V14
819
43–2
007
5612
0--
----
--.1
53.0
9789
0305
2340
WV
2.33
1966
–200
719
----
----
---.1
35.4
4190
0305
2500
WV
14.3
1947
–200
761
----
----
--.1
21.1
6991
0305
3500
WV
277
1908
–200
793
----
----
--.0
00.9
9792
0305
4500
WV
914
1941
–200
767
120
60,0
00--
1--
.151
.072
9303
0550
20W
V0.
6019
66–1
977
12--
----
----
-.091
.730
9403
0550
40W
V3.
1519
64–1
977
14--
----
----
-.121
.584
9503
0562
50W
V96
.819
85–2
007
23--
----
----
.032
.853
9603
0565
00W
V1,
304
1908
–193
831
----
----
---.0
26.8
5297
0305
6600
WV
2.33
1965
–197
713
----
----
--.0
77.7
6098
0305
7300
WV
28.8
1985
–199
915
----
----
--.1
43.4
8899
0305
7500
WV
25.7
1946
–198
540
----
----
---.0
72.5
2110
003
0580
00W
V10
119
47–1
989
4310
2--
--1
---.1
28.2
2910
103
0585
00W
V18
119
16–1
989
74--
----
----
-.123
.124
102
0305
9000
WV
384
1924
–198
360
102
----
----
-.016
.858
103
0305
9500
WV
84.6
1944
–197
027
----
----
---.0
77.5
8810
403
0605
00W
V8.
3219
52–1
969
18--
----
----
.013
.970
105
0306
1000
WV
759
1908
–198
965
----
----
---.0
02.9
8610
603
0615
00W
V11
619
16–2
007
83--
----
----
-.013
.863
107
0306
2400
WV
11.0
1966
–200
237
42--
--1
---.1
88.1
0510
803
0625
00W
V63
.219
47–2
007
36--
----
----
-.159
.178
109
0306
3950
WV
1.08
1965
–197
712
----
--1
--.0
30.9
4511
003
0650
00W
V34
919
41–2
007
6712
0--
--1
--.1
32.1
1711
103
0654
00W
V54
.719
92–2
007
12--
----
----
-.121
.631
112
0306
6000
WV
85.9
1922
–200
786
----
--1
--.1
11.1
3311
303
0671
00W
V0.
1519
52–2
006
55--
----
----
-.070
.455
114
0306
7500
WV
57.6
1922
–200
721
----
----
1.3
29.0
4011
503
0686
10W
V5.
0619
74–1
998
16--
----
----
.117
.558
116
0306
8800
WV
151
1974
–200
718
----
----
--.1
37.4
49
40 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
2.
Floo
d-fre
quen
cy s
tatis
tics
and
drai
nage
are
as fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t st
ates
.—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
- -,
no v
alue
; sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eD
rain
age
area
, in
squ
are
mile
s
Wat
er y
ears
bo
undi
ng
syst
emat
ic
peak
s
Num
ber o
f yea
rs o
f re
cord
Ove
rrid
e of
out
lier t
hres
hold
sN
umbe
r of p
eaks
Tren
d an
alys
is
Syst
emat
icH
isto
ric
Hig
h th
resh
old
disc
harg
e, in
cu
bic
feet
per
se
cond
Low
thre
shol
d di
scha
rge,
in
cubi
c fe
et p
er
seco
nd
Hig
h ou
tlier
Low
ou
tlier
Kend
all’s
ta
uSi
gnifi
canc
e
leve
l
117
0306
9000
WV
213
1911
–200
174
----
--1
--.0
52.5
1311
803
0695
00W
V72
219
14–2
007
9416
4--
--4
--.1
60.0
2311
903
0698
50W
V0.
9519
66–1
977
12--
----
1--
-.030
.945
120
0306
9880
WV
12.2
1968
–200
724
----
----
---.3
55.0
1612
103
0700
00W
V93
919
21–1
996
7416
4--
--2
--.1
80.0
2412
203
0705
00W
V20
019
10–2
007
93--
----
1--
-.041
.564
123
0307
1000
WV
1,35
419
03–1
958
4714
2--
----
---.0
04.9
7812
403
0715
00W
V1,
380
1903
–192
616
142
----
----
----
125
0307
2000
PA22
919
41–2
006
66--
----
----
.007
.943
126
0307
2590
PA16
.319
64–1
978
15--
----
----
.067
.767
127
0307
5450
MD
0.57
1965
–197
612
----
----
----
--12
803
0755
00M
D13
419
36–2
006
65--
----
----
----
129
0307
5600
MD
0.53
1965
–198
622
----
--1
----
--13
003
0765
05M
D0.
2219
65–1
976
12--
----
----
----
131
0307
6600
MD
48.9
1965
–200
743
----
----
----
--13
203
0855
00PA
257
1916
–200
684
----
--1
--.0
78.2
9513
303
1080
00PA
178
1916
–200
680
----
--1
---.1
55.0
4213
403
1090
00O
H6.
1919
47–1
981
35--
----
----
-.032
.798
135
0310
9500
OH
496
1916
–200
691
----
----
---.1
41.0
4913
603
1100
00O
H14
719
41–2
006
66--
----
----
-.189
.025
137
0311
0980
OH
0.04
1978
–198
710
----
----
----
--13
803
1111
50PA
10.3
1961
–198
521
----
----
----
--13
903
1114
50O
H1.
3119
78–1
990
11--
----
----
-.200
.474
140
0311
1455
OH
10.9
1978
–199
011
----
----
----
--14
103
1114
70O
H1.
5719
78–1
987
10--
----
----
----
142
0311
1500
OH
123
1942
–200
665
----
----
1--
--14
303
1115
40O
H0.
3419
78–1
987
10--
----
----
----
144
0311
1548
OH
97.7
1983
–200
623
----
----
--.1
46.3
4214
503
1120
00W
V28
119
41–1
974
34--
----
----
-.037
.767
Table 2 41Ta
ble
2.
Floo
d-fre
quen
cy s
tatis
tics
and
drai
nage
are
as fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t st
ates
.—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
- -,
no v
alue
; sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eD
rain
age
area
, in
squ
are
mile
s
Wat
er y
ears
bo
undi
ng
syst
emat
ic
peak
s
Num
ber o
f yea
rs o
f re
cord
Ove
rrid
e of
out
lier t
hres
hold
sN
umbe
r of p
eaks
Tren
d an
alys
is
Syst
emat
icH
isto
ric
Hig
h th
resh
old
disc
harg
e, in
cu
bic
feet
per
se
cond
Low
thre
shol
d di
scha
rge,
in
cubi
c fe
et p
er
seco
nd
Hig
h ou
tlier
Low
ou
tlier
Kend
all’s
ta
uSi
gnifi
canc
e
leve
l
146
0311
3700
WV
4.95
1970
–199
612
----
----
---.1
82.4
5114
703
1140
00O
H13
419
27–2
002
53--
----
----
.009
.933
148
0311
4240
OH
0.53
1978
–198
710
----
----
---.3
33.2
1014
903
1145
00W
V45
819
16–1
997
78--
----
----
.095
.219
150
0311
4550
WV
0.88
1966
–197
712
----
----
--.2
12.3
7315
103
1146
00W
V1.
2219
67–1
977
11--
----
----
-.018
1.00
015
203
1146
50W
V4.
1919
69–2
007
23--
----
--1
.079
.616
153
0311
5280
OH
5.45
1978
–198
710
----
--1
---.0
221.
000
154
0311
5400
OH
210
1959
–200
634
95--
--1
--.0
66.5
9415
503
1154
10O
H0.
1319
78–1
987
10--
----
----
-.071
.902
156
0311
5500
OH
258
1916
–193
520
----
----
--.0
26.8
9715
703
1155
10O
H1.
5219
78–1
987
10--
----
1--
.444
.118
158
0311
5600
OH
3.46
1947
–197
933
----
----
----
--15
903
1157
10O
H0.
1919
78–1
987
10--
----
1--
----
160
0315
0600
OH
0.99
1966
–198
015
----
----
---.2
38.2
3516
103
1514
00W
V11
219
75–2
007
31--
----
----
.024
.865
162
0315
1500
WV
155
1939
–197
335
----
----
--.0
45.7
1216
303
1520
00W
V38
719
29–1
979
51--
----
----
-.045
.649
164
0315
2200
WV
2.91
1970
–200
621
----
----
--.1
24.4
5016
503
1525
00W
V14
419
38–1
951
14--
----
----
.462
.025
166
0315
3000
WV
166
1939
–197
537
----
----
1.0
87.4
5616
703
1535
00W
V91
319
29–1
979
51--
----
----
.067
.490
168
0315
4000
WV
205
1929
–200
066
----
----
---.1
29.1
2716
903
1542
50W
V2.
8219
70–1
998
13--
----
----
.179
.428
170
0315
4500
WV
79.4
1952
–197
827
51--
--4
--.2
17.1
1817
103
1550
00W
V1,
516
1939
–197
941
----
----
1.0
57.6
0517
203
1552
00W
V21
019
38–1
951
14--
----
----
.330
.112
173
0315
5450
WV
3.52
1965
–199
817
----
----
--.2
06.2
6617
403
1555
00W
V45
319
30–1
997
59--
----
----
-.049
.592
42 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
2.
Floo
d-fre
quen
cy s
tatis
tics
and
drai
nage
are
as fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t st
ates
.—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
- -,
no v
alue
; sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eD
rain
age
area
, in
squ
are
mile
s
Wat
er y
ears
bo
undi
ng
syst
emat
ic
peak
s
Num
ber o
f yea
rs o
f re
cord
Ove
rrid
e of
out
lier t
hres
hold
sN
umbe
r of p
eaks
Tren
d an
alys
is
Syst
emat
icH
isto
ric
Hig
h th
resh
old
disc
harg
e, in
cu
bic
feet
per
se
cond
Low
thre
shol
d di
scha
rge,
in
cubi
c fe
et p
er
seco
nd
Hig
h ou
tlier
Low
ou
tlier
Kend
all’s
ta
uSi
gnifi
canc
e
leve
l
175
0315
5525
WV
25.3
1998
–200
710
----
----
---.2
89.2
8317
603
1595
40O
H15
619
66–2
006
41--
----
11
-.029
.796
177
0315
9700
WV
0.70
1965
–197
713
----
--1
---.1
41.5
4117
803
1715
00VA
2,96
119
15–1
939
25--
----
1--
----
179
0317
3000
VA29
919
38–2
006
69--
----
----
-.044
.594
180
0317
5500
VA22
319
09–2
006
77--
----
----
-.027
.735
181
0317
6400
WV
50.6
1942
–195
110
----
----
--.1
56.5
8918
203
1765
00VA
3,78
319
15–1
938
24--
----
1--
----
183
0317
7500
WV
189
1942
–195
110
----
----
1.1
78.5
3018
403
1777
00VA
39.7
1966
–198
015
----
----
1.3
33.0
9218
503
1785
00W
V32
.019
47–1
998
2956
5,00
0--
1--
.005
.985
186
0317
9000
WV
395
1951
–200
757
----
----
1.0
70.4
4518
703
1795
00W
V43
819
09–1
948
27--
----
----
.217
.118
188
0318
0000
WV
4,60
219
24–1
948
25--
----
1--
----
189
0318
0350
WV
1.13
1966
–197
712
----
----
--.1
67.4
9219
003
1805
00W
V13
319
44–2
007
6411
2--
--2
--.1
18.1
7119
103
1805
30W
V1.
2819
66–1
977
11--
----
----
.236
.350
192
0318
0680
WV
1.52
1965
–197
713
----
----
--.2
05.3
6019
303
1819
00W
V0.
1019
65–1
977
13--
----
--1
-.167
.459
194
0318
2000
WV
108
1946
–199
819
9021
,000
--1
--.1
35.4
4119
503
1825
00W
V54
019
30–2
007
7811
2--
--1
--.1
38.0
7519
603
1827
00W
V14
419
72–1
982
1190
----
----
-.309
.213
197
0318
3000
WV
80.8
1946
–199
830
----
----
--.1
52.2
4619
803
1835
00W
V1,
364
1896
–200
711
2--
----
----
-.031
.635
199
0318
3550
WV
3.84
1966
–197
712
----
----
1.1
36.5
8220
003
1835
70W
V2.
3119
66–1
977
12--
----
----
.076
.783
201
0318
4000
WV
1,61
919
36–2
007
72--
----
----
.047
.563
202
0318
4200
WV
8.27
1970
–200
717
----
----
1-.1
91.3
0320
303
1845
00W
V6,
256
1937
–194
812
----
--1
----
--
Table 2 43Ta
ble
2.
Floo
d-fre
quen
cy s
tatis
tics
and
drai
nage
are
as fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t st
ates
.—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
- -,
no v
alue
; sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eD
rain
age
area
, in
squ
are
mile
s
Wat
er y
ears
bo
undi
ng
syst
emat
ic
peak
s
Num
ber o
f yea
rs o
f re
cord
Ove
rrid
e of
out
lier t
hres
hold
sN
umbe
r of p
eaks
Tren
d an
alys
is
Syst
emat
icH
isto
ric
Hig
h th
resh
old
disc
harg
e, in
cu
bic
feet
per
se
cond
Low
thre
shol
d di
scha
rge,
in
cubi
c fe
et p
er
seco
nd
Hig
h ou
tlier
Low
ou
tlier
Kend
all’s
ta
uSi
gnifi
canc
e
leve
l
204
0318
5000
WV
52.7
1952
–200
736
----
----
--.0
21.8
7020
503
1850
20W
V0.
6219
66–1
977
12--
----
----
.167
.492
206
0318
5500
WV
6,82
619
29–1
948
20--
----
----
----
207
0318
6000
WV
6,85
018
96–1
948
3563
----
----
----
208
0318
6500
WV
128
1930
–200
778
----
----
--.1
21.1
1720
903
1870
00W
V23
619
09–2
000
7710
642
,000
--1
--.0
56.4
7321
003
1873
00W
V9.
7819
69–1
998
19--
----
----
.275
.108
211
0318
7500
WV
80.4
1945
–200
749
----
----
--.1
58.1
1121
203
1890
00W
V15
019
30–1
982
4369
----
1--
.171
.109
213
0318
9100
WV
529
1965
–200
741
76--
--2
--.0
39.7
2821
403
1895
00W
V68
019
09–1
965
45--
----
1--
.100
.338
215
0318
9650
WV
2.78
1966
–197
712
----
----
--.0
001.
000
216
0319
0000
WV
287
1909
–197
151
----
----
--.0
73.4
5521
703
1901
00W
V23
.519
99–2
007
9--
----
----
-.333
.251
218
0319
0400
WV
365
1967
–200
739
----
----
---.1
01.3
7121
903
1905
00W
V4.
2219
66–1
976
11--
----
----
.291
.241
220
0319
1400
WV
3.88
1966
–199
817
331,
800
--1
--.2
79.1
2722
103
1915
00W
V40
.219
46–2
007
37--
----
----
-.009
.948
222
0319
2000
WV
1,31
719
29–1
964
36--
----
----
-.081
.496
223
0319
2500
WV
1,40
219
09–1
930
14--
----
1--
.341
.098
224
0319
3000
WV
8,37
118
78–1
948
71--
----
----
----
225
0319
3725
WV
0.33
1966
–197
712
----
----
1.2
42.3
0122
603
1938
30W
V1.
8019
69–2
007
18--
----
1--
.490
.005
227
0319
4700
WV
266
1930
–200
776
----
----
--.1
73.0
2722
803
1950
00W
V28
119
35–1
963
29--
----
----
----
229
0319
5100
WV
51.9
1975
–198
710
----
--1
--.0
221.
000
230
0319
5250
WV
46.5
1975
–200
730
----
----
--.1
49.2
5423
103
1955
00W
V54
219
39–1
960
2229
----
----
.056
.735
232
0319
5600
WV
6.39
1966
–200
423
----
----
1.1
46.3
42
44 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
2.
Floo
d-fre
quen
cy s
tatis
tics
and
drai
nage
are
as fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t st
ates
.—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
- -,
no v
alue
; sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eD
rain
age
area
, in
squ
are
mile
s
Wat
er y
ears
bo
undi
ng
syst
emat
ic
peak
s
Num
ber o
f yea
rs o
f re
cord
Ove
rrid
e of
out
lier t
hres
hold
sN
umbe
r of p
eaks
Tren
d an
alys
is
Syst
emat
icH
isto
ric
Hig
h th
resh
old
disc
harg
e, in
cu
bic
feet
per
se
cond
Low
thre
shol
d di
scha
rge,
in
cubi
c fe
et p
er
seco
nd
Hig
h ou
tlier
Low
ou
tlier
Kend
all’s
ta
uSi
gnifi
canc
e
leve
l
233
0319
7000
WV
1,14
519
29–1
960
32--
----
1--
-.181
.149
234
0319
7150
WV
2.01
1966
–200
620
----
----
1.1
79.2
8423
503
1979
00W
V0.
4919
64–1
975
12--
----
----
.030
.945
236
0319
8350
WV
62.8
1997
–200
710
----
----
--.0
67.8
5823
703
1984
50W
V7.
7519
65–1
998
18--
----
----
.176
.325
238
0319
8500
WV
391
1909
–200
785
----
----
--.0
19.7
9623
903
1987
80W
V1.
9719
66–1
977
12--
----
----
-.152
.537
240
0319
8800
WV
1.28
1963
–197
714
----
----
---.0
22.9
5624
103
1990
00W
V26
919
31–1
984
54--
----
----
-.020
.835
242
0319
9300
WV
12.2
1979
–200
614
----
----
---.2
09.3
2424
303
1994
00W
V31
819
75–1
984
10--
----
----
.067
.858
244
0320
0500
WV
862
1909
–200
752
----
----
---.0
85.3
7724
503
2006
00W
V0.
8719
66–1
977
12--
----
--1
.258
.271
246
0320
1000
WV
238
1909
–199
954
----
----
---.0
29.7
6024
703
2014
05W
V26
.819
99–2
007
9--
----
----
-.111
.754
248
0320
1410
WV
8.47
1992
–200
716
----
----
1-.1
67.3
9224
903
2014
20W
V2.
0519
65–1
977
13--
----
--1
-.346
.112
250
0320
1440
WV
1.04
1965
–197
713
----
----
---.0
26.9
5125
103
2014
80W
V0.
7019
65–1
977
13--
----
----
-.436
.044
252
0320
2000
OH
585
1916
–200
683
----
----
----
--25
303
2022
45W
V4.
8519
78–2
007
1231
----
1--
-.389
.175
254
0320
2400
WV
306
1969
–200
739
----
----
---.0
69.5
4525
503
2024
80W
V7.
3419
70–2
007
22--
----
----
-.143
.367
256
0320
2750
WV
126
1975
–200
733
----
----
1-.0
61.6
3125
703
2030
00W
V75
819
29–1
979
51--
----
----
.064
.516
258
0320
3600
WV
833
1961
–197
919
----
----
--.0
94.6
0025
903
2040
00W
V1,
224
1916
–197
958
----
----
--.0
65.4
7726
003
2045
00W
V25
619
38–1
980
43--
----
----
.078
.470
261
0320
5995
OH
0.73
1978
–200
615
----
----
--.1
14.5
86
Table 2 45Ta
ble
2.
Floo
d-fre
quen
cy s
tatis
tics
and
drai
nage
are
as fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t st
ates
.—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
- -,
no v
alue
; sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns
rem
oved
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eD
rain
age
area
, in
squ
are
mile
s
Wat
er y
ears
bo
undi
ng
syst
emat
ic
peak
s
Num
ber o
f yea
rs o
f re
cord
Ove
rrid
e of
out
lier t
hres
hold
sN
umbe
r of p
eaks
Tren
d an
alys
is
Syst
emat
icH
isto
ric
Hig
h th
resh
old
disc
harg
e, in
cu
bic
feet
per
se
cond
Low
thre
shol
d di
scha
rge,
in
cubi
c fe
et p
er
seco
nd
Hig
h ou
tlier
Low
ou
tlier
Kend
all’s
ta
uSi
gnifi
canc
e
leve
l
262
0320
6450
WV
4.02
1999
–200
79
----
----
---.1
79.6
1826
303
2066
00W
V38
.519
65–2
007
43--
----
----
.066
.537
264
0320
6800
WV
139
1962
–197
110
59--
--1
---.1
56.5
9226
503
2070
00W
V29
119
16–1
966
3159
----
----
----
266
0320
7020
WV
300
1916
–197
136
59--
----
---.1
08.3
6126
703
2074
00VA
20.0
1951
–197
727
----
----
1-.1
28.3
5926
803
2075
00VA
239
1942
–199
543
----
----
---.1
42.1
8426
903
2078
00VA
297
1968
–200
639
----
----
---.1
00.3
7727
003
2079
62K
Y0.
8219
75–1
984
9--
----
----
.139
.675
271
0320
8000
KY
392
1938
–196
831
----
----
--.0
62.6
3427
203
2085
00VA
286
1927
–200
680
----
----
---.0
51.5
0427
303
2089
50VA
66.5
1964
–200
642
----
--1
---.0
26.8
2027
403
2090
00VA
221
1927
–196
539
----
----
---.1
65.1
4327
503
2095
75K
Y3.
1719
76–1
986
11--
----
1--
-.236
.350
276
0321
0000
KY
56.3
1938
–200
666
----
----
---.0
79.3
5227
703
2115
00K
Y20
619
38–1
949
12--
----
--1
-.030
.945
278
0321
2000
KY
103
1950
–198
132
----
----
---.1
37.2
7727
903
2127
50W
V17
419
86–2
007
22--
----
----
.095
.554
280
0321
2980
WV
209
1986
–200
722
----
----
1.2
12.1
7628
103
2130
00W
V50
419
31–1
986
56--
----
----
.062
.506
282
0321
3500
WV
31.0
1947
–200
746
----
----
--.1
33.1
9528
303
2137
00W
V93
619
68–2
007
40--
----
--1
-.033
.771
284
0321
4000
WV
1,18
819
35–1
985
51--
----
----
----
285
0321
4500
WV
1,28
019
16–2
007
81--
----
----
-.071
.350
286
0321
4900
WV
1,50
719
77–1
995
12--
----
----
-.182
.451
287
0321
5500
KY
217
1916
–198
149
----
----
---.1
68.0
8928
803
2165
00K
Y40
019
37–1
967
30--
----
--1
-.053
.695
289
0321
6540
KY
12.2
1973
–199
119
----
----
1.1
75.3
1029
003
2165
63K
Y0.
9419
76–1
987
12--
----
--1
.045
.891
46 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)1
0159
5000
MD
East
Qs
1,70
02,
600
3,28
05,
390
7,13
09,
760
12,1
0014
,700
17,7
0022
,300
Qr
993
1,62
02,
120
3,84
05,
390
7,78
09,
820
12,1
0014
,600
18,2
00Q
w1,
640
2,53
03,
170
5,08
06,
590
8,89
010
,900
13,2
0015
,800
19,8
002
0159
5300
WV
East
Qs
818
1,05
01,
240
1,87
02,
430
3,35
04,
220
5,28
06,
550
8,67
0Q
r63
81,
030
1,36
02,
440
3,42
04,
920
6,20
07,
610
9,15
011
,400
Qw
799
1,05
01,
250
1,99
02,
750
4,08
05,
290
6,65
08,
180
10,5
003
0159
5500
MD
East
Qs
4,44
06,
160
7,58
012
,400
16,8
0024
,100
31,2
0039
,900
50,6
0068
,600
Qr
2,49
04,
100
5,41
09,
850
13,9
0020
,200
25,6
0031
,600
38,2
0048
,200
Qw
4,28
06,
010
7,39
011
,900
15,9
0022
,500
28,4
0035
,200
43,2
0055
,800
401
5960
00M
DEa
stQ
s4,
050
6,27
08,
020
13,6
0018
,500
26,1
0033
,100
41,2
0050
,700
65,8
00Q
r3,
040
5,02
06,
620
12,1
0017
,000
24,8
0031
,500
38,9
0047
,100
59,5
00Q
w3,
900
6,10
07,
790
13,1
0017
,800
25,3
0032
,000
39,5
0048
,000
60,9
005
0159
6500
MD
East
Qs
847
1,20
01,
480
2,35
03,
100
4,26
05,
300
6,53
07,
960
10,2
00Q
r71
71,
160
1,52
02,
750
3,85
05,
550
7,00
08,
590
10,3
0012
,900
Qw
839
1,20
01,
480
2,41
03,
270
4,71
06,
010
7,50
09,
160
11,7
006
0159
7000
MD
East
Qs
250
376
481
840
1,18
01,
740
2,29
02,
970
3,81
05,
230
Qr
297
477
622
1,11
01,
550
2,23
02,
790
3,42
04,
090
5,09
0Q
w25
438
449
489
81,
300
1,97
02,
570
3,24
03,
990
5,14
07
0159
8000
MD
East
Qs
1,79
02,
690
3,42
05,
860
8,05
011
,600
15,0
0019
,000
23,9
0032
,000
Qr
1,44
02,
350
3,09
05,
610
7,89
011
,400
14,4
0017
,800
21,5
0027
,000
Qw
1,74
02,
640
3,37
05,
780
7,97
011
,500
14,6
0018
,100
22,1
0028
,100
801
5990
00M
DEa
stQ
s1,
010
1,49
01,
860
3,00
03,
960
5,44
06,
750
8,27
010
,000
12,7
00Q
r98
51,
600
2,11
03,
810
5,34
07,
720
9,74
012
,000
14,4
0018
,100
Qw
1,01
01,
490
1,87
03,
090
4,22
06,
080
7,79
09,
730
11,9
0015
,200
901
5995
00W
VEa
stQ
s42
576
01,
020
1,85
02,
520
3,53
04,
400
5,36
06,
430
8,02
0Q
r68
61,
110
1,46
02,
630
3,68
05,
300
6,68
08,
200
9,87
012
,300
Qw
455
801
1,08
02,
080
3,03
04,
560
5,88
07,
340
8,92
011
,200
1001
6000
00M
DEa
stQ
s7,
960
12,2
0015
,600
26,6
0036
,100
51,2
0065
,000
81,3
0010
0,00
013
1,00
0Q
r5,
620
9,33
012
,300
22,6
0032
,000
46,8
0059
,600
73,8
0089
,700
114,
000
Qw
7,41
011
,600
14,8
0024
,700
33,6
0048
,000
60,7
0075
,200
91,4
0011
6,00
0
Table 3 47Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)11
0160
1500
MD
East
Qs
3,31
04,
820
6,07
010
,400
14,4
0021
,100
27,6
0035
,600
45,6
0062
,400
Qr
2,69
04,
430
5,84
010
,600
15,0
0021
,800
27,7
0034
,200
41,4
0052
,300
Qw
3,28
04,
800
6,06
010
,400
14,5
0021
,300
27,6
0035
,000
43,5
0057
,000
1201
6030
00M
DEa
stQ
s10
,500
14,5
0017
,600
27,3
0035
,500
48,2
0059
,700
73,1
0088
,600
113,
000
Qr
7,59
012
,600
16,8
0030
,800
43,7
0063
,900
81,5
0010
1,00
012
3,00
015
6,00
0Q
w10
,300
14,4
0017
,500
27,9
0037
,700
54,4
0069
,800
87,4
0010
7,00
013
8,00
013
0160
4500
WV
East
Qs
1,52
02,
730
3,67
06,
560
8,91
012
,300
15,3
0018
,400
22,0
0027
,100
Qr
2,46
04,
040
5,33
09,
700
13,7
0019
,900
25,2
0031
,100
37,6
0047
,500
Qw
1,56
02,
780
3,75
06,
940
9,84
014
,600
18,9
0023
,700
28,9
0036
,600
1401
6055
00W
VEa
stQ
s1,
840
3,27
04,
520
9,07
013
,500
21,2
0028
,800
38,4
0050
,300
70,6
00Q
r2,
070
3,39
04,
470
8,13
011
,500
16,6
0021
,100
26,0
0031
,400
39,6
00Q
w1,
850
3,28
04,
520
8,92
013
,000
19,3
0025
,000
31,5
0039
,000
50,9
0015
0160
5700
WV
East
Qs
11.2
1619
.831
.942
.358
.773
.691
.111
214
5Q
r8.
913
.717
.630
.742
.158
.972
.787
.510
312
5Q
w10
.815
.619
.431
.542
.258
.873
88.5
105
130
1601
6060
00W
VEa
stQ
s4,
500
6,43
08,
050
13,7
0018
,900
27,9
0036
,700
47,7
0061
,500
84,9
00Q
r3,
240
5,35
07,
060
12,9
0018
,200
26,5
0033
,600
41,5
0050
,300
63,6
00Q
w4,
420
6,37
07,
980
13,5
0018
,700
27,4
0035
,300
44,5
0055
,200
72,2
0017
0160
6500
WV
East
Qs
6,66
010
,200
13,1
0023
,200
32,9
0049
,300
65,3
0085
,300
110,
000
153,
000
Qr
5,95
09,
880
13,1
0024
,000
34,0
0049
,600
63,2
0078
,400
95,2
0012
1,00
0Q
w6,
630
10,2
0013
,100
23,3
0033
,100
49,4
0064
,500
82,2
0010
3,00
013
6,00
018
0160
6800
WV
East
Qs
14.7
27.1
38.7
84.2
133
223
319
446
613
915
Qr
42.6
6786
.615
321
129
837
145
053
465
6Q
w17
.831
.745
.710
717
027
135
644
955
070
119
0160
7500
WV
East
Qs
1,51
02,
440
3,28
06,
550
10,0
0016
,500
23,5
0032
,800
45,2
0068
,200
Qr
1,31
02,
150
2,82
05,
120
7,19
010
,400
13,2
0016
,200
19,5
0024
,500
Qw
1,50
02,
430
3,25
06,
340
9,32
014
,200
18,6
0023
,800
30,0
0040
,400
2001
6075
10W
VEa
stQ
sa 1
3.8
22.9
30.6
57.5
82.7
125
166
216
278
381
Qr
30.6
47.9
61.8
109
150
212
263
318
377
462
Qw
16.6
2736
.977
.911
918
423
929
635
944
9
48 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)21
0160
8000
WV
East
Qs
2,71
04,
440
5,94
011
,300
16,6
0025
,800
34,9
0046
,500
61,2
0086
,500
Qr
2,95
04,
870
6,43
011
,700
16,5
0024
,100
30,5
0037
,700
45,7
0057
,700
Qw
2,72
04,
460
5,97
011
,400
16,6
0025
,200
33,1
0042
,400
53,2
0070
,500
2201
6081
00W
VEa
stQ
s30
.840
.346
.361
.371
.383
.993
.410
311
312
6Q
r8.
312
.716
.328
.539
54.5
67.3
80.9
95.4
116
Qw
25.1
3438
.446
.953
.264
.374
.886
.799
.711
823
0160
8500
WV
East
Qs
10,7
0017
,200
22,7
0041
,700
59,7
0090
,400
120,
000
157,
000
203,
000
280,
000
Qr
11,5
0019
,300
25,6
0047
,200
67,1
0098
,500
126,
000
156,
000
191,
000
243,
000
Qw
10,7
0017
,300
22,8
0042
,300
61,1
0092
,800
122,
000
157,
000
197,
000
262,
000
2401
6090
00M
DEa
stQ
s1,
860
3,00
03,
850
6,36
08,
340
11,2
0013
,600
16,2
0019
,100
23,4
00Q
r1,
770
2,90
03,
820
6,93
09,
760
14,1
0017
,900
22,1
0026
,700
33,6
00Q
w1,
850
2,99
03,
850
6,53
08,
940
12,9
0016
,300
20,2
0024
,400
30,7
0025
0160
9500
MD
East
Qs
163
223
267
398
502
658
792
943
1,11
01,
370
Qr
112
178
231
411
570
811
1,01
01,
230
1,47
01,
820
Qw
156
218
262
401
529
737
922
1,13
01,
350
1,68
026
0160
9650
WV
East
Qs
a 381
a 741
1,05
02,
150
3,18
04,
880
6,47
08,
390
10,7
0014
,400
Qr
465
750
981
1,76
02,
470
3,54
04,
460
5,46
06,
560
8,18
0Q
w40
274
41,
030
1,93
02,
670
3,79
04,
730
5,79
06,
950
8,71
027
0160
9800
WV
East
Qs
2,07
03,
080
3,81
05,
980
7,68
010
,200
12,3
0014
,600
17,2
0021
,000
Qr
1,37
02,
230
2,94
05,
320
7,48
010
,800
13,7
0016
,900
20,3
0025
,600
Qw
1,87
02,
850
3,54
05,
640
7,55
010
,700
13,4
0016
,500
19,9
0025
,000
2801
6100
00W
VEa
stQ
s23
,700
34,0
0041
,700
64,6
0083
,100
111,
000
134,
000
161,
000
191,
000
237,
000
2901
6101
50M
DEa
stQ
s16
728
437
566
691
11,
290
1,62
01,
990
2,42
03,
070
Qr
201
322
419
749
1,04
01,
490
1,87
02,
280
2,73
03,
380
Qw
172
289
383
694
974
1,41
01,
790
2,20
02,
650
3,31
030
0161
0155
MD
East
Qs
1,41
02,
620
3,62
07,
010
10,0
0014
,800
19,2
0024
,300
30,2
0039
,500
Qr
1,30
02,
130
2,80
05,
080
7,13
010
,300
13,0
0016
,100
19,4
0024
,300
Qw
1,39
02,
530
3,44
06,
190
8,37
011
,600
14,4
0017
,600
21,2
0026
,700
Table 3 49Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)31
0161
0500
WV
East
Qs
2,60
05,
190
7,42
015
,100
22,0
0033
,100
43,1
0054
,900
68,6
0090
,000
Qr
3,21
05,
290
6,98
012
,700
18,0
0026
,200
33,2
0041
,100
49,8
0062
,900
Qw
2,72
05,
210
7,31
014
,000
19,5
0027
,900
35,1
0043
,300
52,4
0066
,400
3201
6115
00W
VEa
stQ
s5,
110
9,49
013
,000
24,1
0033
,400
47,3
0059
,300
72,7
0087
,600
110,
000
Qr
6,12
010
,200
13,5
0024
,700
35,0
0051
,200
65,2
0080
,800
98,2
0012
5,00
0Q
w5,
150
9,52
013
,000
24,2
0033
,700
48,5
0061
,500
76,0
0092
,300
117,
000
3301
6125
00M
DEa
stQ
s24
540
352
490
11,
210
1,68
02,
080
2,54
03,
060
3,84
0Q
r30
048
162
81,
130
1,57
02,
250
2,82
03,
450
4,14
05,
150
Qw
253
414
542
979
1,39
02,
040
2,60
03,
210
3,88
04,
860
3401
6130
00M
DEa
stQ
s28
,400
42,3
0053
,100
86,8
0011
5,00
015
9,00
019
9,00
024
4,00
029
7,00
037
9,00
035
0161
3150
MD
East
Qs
126
190
237
377
489
653
793
949
1,12
01,
380
Qr
107
170
221
392
544
773
966
1,18
01,
400
1,73
0Q
w12
418
823
538
151
272
090
11,
100
1,32
01,
630
3601
6131
60M
DEa
stQ
sa 6
8.4
89.9
105
148
180
226
263
304
349
414
Qr
34.4
53.9
69.6
123
169
239
297
359
426
523
Qw
60.2
8296
.113
717
423
528
834
640
950
037
0161
3900
VAEa
stQ
s29
860
485
61,
660
2,32
03,
310
4,13
05,
040
6,04
07,
480
Qr
285
458
597
1,07
01,
490
2,13
02,
680
3,27
03,
920
4,88
0Q
w29
759
383
21,
530
2,05
02,
750
3,34
03,
990
4,71
05,
790
3801
6140
00W
VEa
stQ
s2,
820
4,40
05,
590
9,25
012
,200
16,7
0020
,600
25,0
0029
,900
37,4
00Q
r2,
580
4,25
05,
610
10,2
0014
,400
20,9
0026
,600
32,8
0039
,700
50,1
00Q
w2,
800
4,39
05,
590
9,42
012
,800
18,4
0023
,400
29,0
0035
,300
44,7
0039
0161
5000
VAEa
stQ
s97
31,
780
2,42
04,
480
6,22
08,
860
11,2
0013
,800
16,7
0021
,100
Qr
824
1,34
01,
760
3,17
04,
450
6,41
08,
090
9,93
012
,000
15,0
00Q
w96
41,
750
2,37
04,
240
5,71
07,
830
9,64
011
,700
13,9
0017
,400
4001
6160
00VA
East
Qs
237
411
544
935
1,24
01,
680
2,04
02,
420
2,84
03,
440
Qr
301
484
631
1,13
01,
580
2,26
02,
840
3,47
04,
160
5,17
0Q
w24
341
855
498
51,
370
1,98
02,
500
3,08
03,
710
4,61
0
50 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)41
0161
6500
WV
East
Qs
1,87
03,
320
4,48
08,
230
11,4
0016
,300
20,7
0025
,700
31,3
0040
,000
Qr
2,92
04,
810
6,35
011
,600
16,3
0023
,800
30,2
0037
,300
45,1
0057
,000
Qw
1,92
03,
390
4,59
08,
700
12,5
0018
,900
24,6
0031
,100
38,3
0049
,000
4201
6170
00W
VEa
stQ
s83
.313
116
727
836
850
462
175
490
31,
130
4301
6178
00M
DEa
stQ
s37
.973
.310
319
828
040
651
664
178
199
444
0161
8000
MD
East
Qs
36,2
0053
,900
66,9
0010
5,00
013
5,00
018
0,00
021
7,00
025
8,00
030
4,00
037
3,00
045
0161
9475
MD
East
Qs
8.2
15.1
21.3
44.3
67.2
108
148
199
263
373
4601
6195
00M
DEa
stQ
s1,
220
2,00
02,
600
4,51
06,
110
8,57
010
,700
13,2
0016
,100
20,5
0047
0162
0500
VAEa
stQ
s25
749
972
71,
640
2,63
04,
500
6,49
09,
140
12,6
0019
,000
4801
6210
00VA
East
Qs
1,22
01,
770
2,25
03,
980
5,68
08,
680
11,7
0015
,600
20,6
0029
,300
Qr
992
1,62
02,
120
3,83
05,
380
7,77
09,
810
12,1
0014
,500
18,2
00Q
w1,
190
1,75
02,
230
3,94
05,
560
8,18
010
,500
13,2
0016
,200
20,9
0049
0162
1200
VAEa
stQ
s26
642
254
795
61,
320
1,90
02,
430
3,06
03,
800
5,00
0Q
r19
130
539
770
898
61,
410
1,76
02,
150
2,57
03,
190
Qw
257
409
526
884
1,18
01,
620
2,00
02,
430
2,92
03,
650
5001
6214
00VA
East
Qs
293
396
471
691
866
1,12
01,
340
1,59
01,
860
2,28
0Q
r11
818
824
543
560
486
01,
080
1,31
01,
560
1,93
0Q
w24
634
540
756
970
693
21,
130
1,36
01,
610
1,99
051
0162
1450
VAEa
stQ
s22
.232
.641
.169
.896
139
181
231
293
396
Qr
21.3
33.3
42.9
75.3
104
146
181
218
258
316
Qw
2232
.741
.572
.110
014
418
122
126
532
952
0162
2000
VAEa
stQ
s3,
250
5,19
06,
810
12,4
0017
,700
26,6
0035
,200
45,8
0058
,800
80,8
00Q
r3,
790
6,27
08,
290
15,1
0021
,400
31,2
0039
,600
49,0
0059
,400
75,2
00Q
w3,
270
5,23
06,
880
12,7
0018
,400
28,0
0036
,800
47,2
0059
,100
77,9
0053
0162
2100
VAEa
stQ
s26
.944
.658
.510
213
819
424
329
836
245
9Q
r42
.667
86.6
153
211
298
371
450
534
656
Qw
29.8
48.6
64.6
123
178
265
338
416
500
620
5401
6223
00VA
East
Qs
33.7
45.2
53.0
73.8
88.8
109
125
143
161
187
5501
6224
00VA
East
Qs
a27.
842
.854
.793
.312
718
123
128
935
846
9
Table 3 51Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)56
0163
2000
VAEa
stQ
s3,
420
6,06
08,
090
14,3
0019
,200
26,4
0032
,400
39,0
0046
,200
56,7
00Q
r2,
360
3,87
05,
110
9,30
013
,100
19,0
0024
,100
29,8
0036
,000
45,4
00Q
w3,
370
5,95
07,
910
13,6
0017
,800
23,9
0029
,000
34,8
0041
,200
51,0
0057
0163
2300
VAEa
stQ
s43
.387
.412
929
447
079
61,
140
1,58
02,
160
3,18
0Q
r16
125
833
559
883
11,
180
1,48
01,
810
2,16
02,
680
Qw
50.2
98.2
146
359
594
992
1,34
01,
730
2,16
02,
810
5801
6329
00VA
East
Qs
707
1,47
02,
130
4,38
06,
380
9,53
012
,300
15,6
0019
,200
24,9
00Q
r1,
220
1,98
02,
610
4,72
06,
630
9,59
012
,100
14,9
0018
,000
22,6
00Q
w73
61,
500
2,17
04,
450
6,46
09,
560
12,2
0015
,200
18,5
0023
,400
5901
6329
50VA
East
Qs
1318
.822
.833
.741
.652
.461
7079
.693
.1Q
r12
.219
24.4
42.6
58.5
8210
112
214
417
6Q
w12
.818
.823
.237
.250
.471
.489
.110
812
815
660
0163
2970
VAEa
stQ
s92
.617
925
552
778
61,
220
1,64
02,
140
2,75
03,
760
Qr
139
221
288
512
712
1,01
01,
270
1,55
01,
850
2,29
0Q
w95
.718
225
852
476
11,
120
1,43
01,
770
2,15
02,
730
6101
6330
00VA
East
Qs
4,62
08,
120
10,8
0019
,100
25,8
0035
,600
43,9
0053
,000
63,0
0077
,700
Qr
4,85
08,
050
10,6
0019
,500
27,6
0040
,200
51,2
0063
,400
77,0
0097
,500
Qw
4,63
08,
120
10,8
0019
,200
26,2
0037
,200
46,9
0057
,800
69,9
0087
,900
6201
6335
00VA
East
Qs
a 934
1,56
02,
050
3,65
05,
030
7,19
09,
120
11,4
0014
,000
18,0
00Q
r1,
040
1,70
02,
230
4,03
05,
660
8,17
010
,300
12,7
0015
,300
19,2
00Q
w94
31,
570
2,07
03,
740
5,25
07,
670
9,81
012
,200
14,8
0018
,800
6301
6336
50VA
East
Qs
39.1
77.3
111
233
350
547
736
966
1,24
01,
700
Qr
81.2
129
167
296
410
582
726
882
1,05
01,
300
Qw
41.3
80.2
115
245
367
562
731
917
1,12
01,
440
6401
6340
00VA
East
Qs
4,91
08,
420
11,4
0021
,500
30,9
0046
,600
61,5
0079
,600
102,
000
138,
000
Qr
6,82
011
,400
15,0
0027
,600
39,1
0057
,200
72,9
0090
,400
110,
000
140,
000
Qw
4,98
08,
530
11,6
0022
,200
32,5
0049
,800
65,8
0084
,300
105,
000
139,
000
6501
6345
00VA
East
Qs
1,25
02,
340
3,25
06,
400
9,25
013
,900
18,1
0023
,200
29,1
0038
,600
Qr
1,30
02,
130
2,80
05,
080
7,13
010
,300
13,0
0016
,100
19,4
0024
,300
Qw
1,25
02,
330
3,22
06,
190
8,72
012
,500
15,8
0019
,500
23,7
0030
,200
52 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)66
0163
6500
WV
East
Qs
14,0
0024
,500
32,8
0059
,200
81,4
0011
5,00
014
5,00
017
8,00
021
6,00
027
4,00
067
0163
7000
MD
East
Qs
184
375
553
1,26
01,
990
3,32
04,
690
6,45
08,
710
12,7
0068
0163
7500
MD
East
Qs
1,02
01,
830
2,48
04,
580
6,37
09,
130
11,6
0014
,300
17,5
0022
,300
6901
6384
80VA
East
Qs
1,30
02,
690
3,87
07,
780
11,1
0016
,300
20,8
0025
,800
31,4
0039
,800
7001
6385
00M
DEa
stQ
s54
,000
81,8
0010
2,00
016
1,00
020
7,00
027
2,00
032
7,00
038
7,00
045
3,00
054
9,00
071
0164
3700
VAEa
stQ
s1,
340
2,71
03,
890
8,03
011
,800
18,0
0023
,600
30,3
0038
,100
50,5
00Q
r1,
510
2,47
03,
250
5,90
08,
290
12,0
0015
,200
18,7
0022
,600
28,4
00Q
w1,
360
2,69
03,
810
7,43
010
,300
14,6
0018
,200
22,2
0026
,800
33,8
0072
0164
4000
VAEa
stQ
s2,
920
5,26
07,
260
14,3
0020
,900
31,9
0042
,300
55,1
0070
,600
96,0
00Q
r3,
430
5,66
07,
470
13,6
0019
,300
28,1
0035
,600
44,0
0053
,400
67,5
00Q
w2,
940
5,28
07,
270
14,2
0020
,500
30,6
0039
,600
50,0
0061
,900
80,7
0073
0164
4100
VAEa
stQ
s17
629
538
768
092
51,
300
1,63
02,
000
2,42
03,
070
7402
0095
00VA
Cen
tral
Qs
a 24.
429
.132
.039
.344
.250
.455
.059
.764
.571
.075
0201
1400
VAC
entra
lQ
s1,
940
2,90
03,
650
6,03
08,
080
11,3
0014
,200
17,6
0021
,600
28,0
0076
0201
1460
VAC
entra
lQ
s1,
560
2,28
02,
820
4,49
05,
860
7,95
09,
780
11,9
0014
,300
18,0
0077
0201
1480
VAC
entra
lQ
s2,
620
3,66
04,
360
6,17
07,
430
9,08
010
,400
11,7
0013
,000
14,9
00Q
r2,
010
2,88
03,
480
5,15
06,
370
8,03
09,
340
10,7
0012
,200
14,2
00Q
w2,
510
3,54
04,
220
5,95
07,
150
8,77
010
,000
11,4
0012
,700
14,6
0078
0201
1500
VAC
entra
lQ
s3,
240
4,86
05,
940
8,70
010
,600
12,9
0014
,700
16,5
0018
,300
20,7
00Q
r2,
940
4,15
05,
000
7,31
08,
990
11,3
0013
,000
14,9
0016
,900
19,6
00Q
w3,
220
4,82
05,
890
8,58
010
,400
12,7
0014
,500
16,3
0018
,100
20,5
0079
0201
2500
VAC
entra
lQ
s4,
960
8,14
010
,300
16,0
0019
,900
24,8
0028
,500
32,1
0035
,700
40,5
00Q
r8,
160
11,2
0013
,300
18,8
0022
,800
28,0
0032
,200
36,5
0041
,000
47,3
00Q
w5,
030
8,21
010
,400
16,1
0020
,000
25,0
0028
,700
32,4
0036
,100
41,0
0080
0201
2950
VAC
entra
lQ
sa 6
.06
a 20.
637
.711
821
138
656
679
51,
080
1,56
0Q
r29
.147
.160
.810
213
518
222
126
330
837
3Q
w7.
322
.439
.711
619
432
945
761
179
41,
090
8102
0130
00VA
Cen
tral
Qs
2,52
04,
100
5,27
08,
660
11,3
0015
,000
18,0
0021
,300
24,8
0030
,000
Qr
3,49
04,
910
5,90
08,
580
10,5
0013
,100
15,2
0017
,400
19,6
0022
,800
Qw
2,54
04,
120
5,28
08,
660
11,2
0014
,900
17,8
0021
,000
24,5
0029
,400
Table 3 53Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)82
0201
4000
VAC
entra
lQ
s1,
920
3,13
03,
980
6,29
07,
940
10,1
0011
,800
13,5
0015
,300
17,8
00Q
r3,
310
4,67
05,
610
8,18
010
,000
12,5
0014
,500
16,6
0018
,800
21,8
00Q
w1,
950
3,16
04,
020
6,35
08,
030
10,2
0012
,000
13,7
0015
,500
18,0
0083
0305
0000
WV
Cen
tral
Qs
4,27
05,
760
6,79
09,
560
11,6
0014
,300
16,6
0018
,900
21,4
0025
,000
Qr
3,94
05,
530
6,63
09,
600
11,7
0014
,600
16,9
0019
,300
21,8
0025
,300
Qw
4,26
05,
760
6,79
09,
560
11,6
0014
,400
16,6
0018
,900
21,4
0025
,000
8403
0505
00W
VC
entra
lQ
s5,
090
6,41
07,
300
9,67
011
,400
13,7
0015
,500
17,4
0019
,400
22,3
00Q
r5,
590
7,76
09,
250
13,3
0016
,100
20,0
0023
,000
26,2
0029
,500
34,1
00Q
w5,
100
6,44
07,
350
9,80
011
,600
14,0
0015
,900
17,9
0020
,000
23,0
0085
0305
0650
WV
Cen
tral
Qs
23.3
35.6
46.2
83.6
120
183
245
325
425
598
Qr
16.4
2735
.260
.380
.410
913
316
018
822
8Q
w22
.234
.444
.678
.811
016
120
826
633
645
086
0305
1000
WV
Cen
tral
Qs
6,97
08,
930
10,2
0013
,500
15,8
0018
,700
21,0
0023
,300
25,8
0029
,100
Qr
8,08
011
,100
13,2
0018
,700
22,6
0027
,800
31,9
0036
,200
40,7
0046
,900
Qw
6,99
08,
960
10,2
0013
,600
15,9
0019
,000
21,3
0023
,800
26,3
0029
,700
8703
0515
00W
VC
entra
lQ
s2,
800
4,00
04,
850
7,23
09,
010
11,5
0013
,600
15,8
0018
,100
21,6
00Q
r2,
690
3,82
04,
610
6,75
08,
310
10,4
0012
,100
13,8
0015
,700
18,2
00Q
w2,
790
3,99
04,
840
7,20
08,
950
11,4
0013
,400
15,5
0017
,800
21,2
0088
0305
2000
WV
Cen
tral
Qs
3,69
05,
100
6,06
08,
630
10,5
0013
,000
15,0
0017
,000
19,2
0022
,300
Qr
3,21
04,
540
5,45
07,
950
9,76
012
,200
14,1
0016
,100
18,3
0021
,200
Qw
3,67
05,
080
6,04
08,
600
10,4
0012
,900
14,9
0017
,000
19,2
0022
,200
8903
0523
40W
VC
entra
lQ
s90
.412
815
522
727
935
140
947
153
663
0Q
r72
.311
414
523
831
041
249
558
467
981
6Q
w87
.512
615
422
928
636
643
150
057
468
090
0305
2500
WV
Cen
tral
Qs
412
631
797
1,30
01,
720
2,34
02,
880
3,50
04,
190
5,26
0Q
r38
057
070
81,
100
1,40
01,
810
2,14
02,
490
2,86
03,
390
Qw
411
629
794
1,29
01,
690
2,29
02,
810
3,39
04,
040
5,03
091
0305
3500
WV
Cen
tral
Qs
4,85
06,
500
7,49
09,
770
11,2
0012
,800
13,9
0015
,000
16,1
0017
,400
Qr
5,70
07,
910
9,43
013
,500
16,4
0020
,400
23,4
0026
,700
30,0
0034
,700
Qw
4,87
06,
520
7,52
09,
850
11,3
0013
,000
14,3
0015
,400
16,6
0018
,000
54 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)92
0305
4500
WV
Cen
tral
Qs
14,6
0019
,300
22,3
0030
,200
35,7
0043
,000
48,5
0054
,300
60,3
0068
,600
Qr
17,0
0022
,800
26,7
0037
,100
44,3
0054
,000
61,5
0069
,300
77,4
0088
,700
Qw
14,7
0019
,400
22,4
0030
,400
36,0
0043
,400
49,1
0055
,000
61,1
0069
,600
9303
0550
20W
VC
entra
lQ
s31
.151
.566
.811
214
719
723
828
433
340
4Q
r20
.934
.244
.475
.510
013
616
519
723
228
1Q
w28
.447
.461
.399
.912
917
120
624
428
634
694
0305
5040
WV
Cen
tral
Qs
99.4
160
208
359
489
691
871
1,08
01,
320
1,70
0Q
r95
.214
918
930
739
852
763
174
386
31,
030
Qw
98.6
158
205
347
463
635
784
951
1,14
01,
420
9503
0562
50W
VC
entra
lQ
s2,
910
3,99
04,
720
6,72
08,
170
10,1
0011
,700
13,4
0015
,200
17,7
00Q
r2,
180
3,11
03,
760
5,55
06,
860
8,63
010
,000
11,5
0013
,000
15,2
00Q
w2,
840
3,92
04,
640
6,58
07,
980
9,89
011
,400
13,0
0014
,800
17,2
0096
0305
6500
WV
Cen
tral
Qs
20,2
0026
,600
30,9
0042
,200
50,2
0061
,000
69,5
0078
,500
87,9
0010
1,00
0Q
r23
,500
31,3
0036
,500
50,0
0059
,500
72,1
0081
,900
92,0
0010
3,00
011
7,00
0Q
w20
,300
26,8
0031
,100
42,6
0050
,900
62,0
0070
,700
79,8
0089
,400
103,
000
9703
0566
00W
VC
entra
lQ
s10
416
120
231
840
552
662
473
084
21,
000
Qr
7211
414
523
831
041
249
558
467
981
6Q
w97
152
190
296
375
485
576
673
777
927
9803
0573
00W
VW
est
Qs
864
1,28
01,
570
2,34
02,
890
3,63
04,
220
4,83
05,
470
6,37
0Q
r73
91,
180
1,50
02,
400
3,06
03,
950
4,64
05,
360
6,11
07,
140
Qw
837
1,26
01,
560
2,35
02,
940
3,74
04,
380
5,04
05,
730
6,70
099
0305
7500
WV
Wes
tQ
s86
71,
130
1,29
01,
650
1,87
02,
130
2,31
02,
490
2,65
02,
870
Qr
678
1,08
01,
380
2,21
02,
830
3,65
04,
300
4,97
05,
660
6,62
0Q
w84
81,
130
1,30
01,
700
1,98
02,
340
2,60
02,
870
3,14
03,
480
100
0305
8000
WV
Wes
tQ
s1,
950
2,69
03,
190
4,48
05,
370
6,54
07,
450
8,38
09,
340
10,7
00Q
r1,
930
2,99
03,
750
5,85
07,
360
9,36
010
,900
12,5
0014
,100
16,4
00Q
w1,
950
2,71
03,
220
4,58
05,
560
6,89
07,
930
9,00
010
,100
11,6
0010
103
0585
00W
VW
est
Qs
3,52
05,
060
6,07
08,
620
10,3
0012
,500
14,1
0015
,800
17,4
0019
,600
Qr
3,01
04,
610
5,75
08,
850
11,1
0014
,000
16,2
0018
,500
20,9
0024
,100
Qw
3,50
05,
050
6,06
08,
630
10,4
0012
,600
14,3
0016
,000
17,8
0020
,100
Table 3 55Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)10
203
0590
00W
VW
est
Qs
6,32
08,
630
10,0
0013
,100
15,0
0017
,100
18,6
0020
,000
21,3
0023
,000
Qr
5,34
08,
060
9,95
015
,100
18,7
0023
,500
27,1
0030
,700
34,5
0039
,500
Qw
6,27
08,
610
10,0
0013
,200
15,2
0017
,600
19,3
0021
,000
22,6
0024
,600
103
0305
9500
WV
Wes
tQ
s1,
230
2,04
02,
640
4,40
05,
750
7,65
09,
220
10,9
0012
,700
15,3
00Q
r1,
680
2,62
03,
300
5,16
06,
500
8,29
09,
670
11,1
0012
,500
14,5
00Q
w1,
280
2,09
02,
690
4,49
05,
870
7,79
09,
320
10,9
0012
,700
15,1
0010
403
0605
00W
VW
est
Qs
329
611
827
1,46
01,
930
2,59
03,
110
3,66
04,
240
5,04
0Q
r28
747
060
699
41,
280
1,68
01,
990
2,32
02,
660
3,14
0Q
w32
058
778
91,
340
1,73
02,
240
2,64
03,
060
3,51
04,
130
105
0306
1000
WV
Wes
tQ
s10
,300
14,8
0017
,700
24,8
0029
,500
35,4
0039
,700
43,9
0048
,200
53,8
00Q
r8,
980
13,3
0016
,400
24,5
0030
,100
37,5
0043
,000
48,6
0054
,300
62,0
00Q
w10
,200
14,8
0017
,700
24,8
0029
,600
35,5
0040
,000
44,4
0048
,800
54,7
0010
603
0615
00W
VW
est
Qs
3,34
04,
490
5,20
06,
910
8,00
09,
340
10,3
0011
,300
12,2
0013
,500
Qr
2,14
03,
320
4,15
06,
450
8,10
010
,300
12,0
0013
,700
15,5
0017
,900
Qw
3,28
04,
450
5,17
06,
890
8,01
09,
410
10,5
0011
,500
12,5
0013
,900
107
0306
2400
WV
Wes
tQ
s23
636
647
382
91,
150
1,68
02,
180
2,79
03,
520
4,72
0Q
r35
557
874
31,
210
1,56
02,
040
2,41
02,
800
3,21
03,
780
Qw
246
379
490
866
1,21
01,
750
2,23
02,
790
3,44
04,
460
108
0306
2500
WV
Wes
tQ
s75
71,
180
1,51
02,
540
3,39
04,
700
5,86
07,
180
8,70
011
,000
Qr
1,35
02,
110
2,66
04,
190
5,30
06,
780
7,93
09,
110
10,3
0012
,000
Qw
798
1,23
01,
570
2,67
03,
610
5,01
06,
220
7,55
09,
040
11,3
0010
903
0639
50W
VC
entra
lQ
s29
.946
.161
120
183
303
435
615
861
1,32
0Q
r35
.857
.674
.212
416
422
026
631
636
944
6Q
w31
.148
.163
.512
117
627
036
047
260
984
111
003
0650
00W
VC
entra
lQ
s7,
890
10,5
0012
,700
19,8
0026
,200
36,7
0046
,600
58,6
0073
,100
97,2
00Q
r7,
040
9,71
011
,500
16,4
0019
,900
24,6
0028
,300
32,1
0036
,100
41,6
00Q
w7,
870
10,5
0012
,700
19,7
0025
,900
35,9
0045
,300
56,5
0069
,900
91,9
0011
103
0654
00W
VC
entra
lQ
s90
61,
220
1,47
02,
260
2,93
03,
980
4,94
06,
060
7,39
09,
500
Qr
1,29
01,
880
2,29
03,
430
4,27
05,
410
6,33
07,
280
8,30
09,
720
Qw
959
1,29
01,
570
2,46
03,
210
4,34
05,
320
6,42
07,
670
9,57
0
56 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)11
203
0660
00W
VC
entra
lQ
s1,
530
2,06
02,
470
3,73
04,
780
6,38
07,
800
9,45
011
,300
14,3
00Q
r1,
950
2,80
03,
390
5,02
06,
210
7,83
09,
110
10,5
0011
,900
13,9
00Q
w1,
540
2,07
02,
490
3,77
04,
830
6,44
07,
870
9,50
011
,400
14,3
0011
303
0671
00W
VC
entra
lQ
s3.
55.
46.
811
14.4
19.5
23.8
28.7
34.1
42.3
Qr
5.89
1013
.223
.431
.743
.854
65.1
77.2
94.7
Qw
3.63
5.6
7.08
11.8
15.7
21.6
26.7
32.3
38.6
47.9
114
0306
7500
WV
Cen
tral
Qs
2,77
03,
550
4,06
05,
360
6,26
07,
440
8,35
09,
280
10,3
0011
,600
Qr
1,36
01,
960
2,39
03,
580
4,45
05,
650
6,60
07,
590
8,64
010
,100
Qw
2,58
03,
380
3,88
05,
090
5,94
07,
080
7,97
08,
910
9,89
011
,300
115
0306
8610
WV
Cen
tral
Qs
135
191
231
350
443
578
693
821
963
1,18
0Q
r14
722
728
645
859
077
592
51,
090
1,26
01,
500
Qw
137
195
238
369
474
626
754
893
1,05
01,
270
116
0306
8800
WV
Cen
tral
Qs
6,77
09,
140
10,8
0015
,300
18,5
0023
,100
26,7
0030
,600
34,8
0040
,800
Qr
3,27
04,
620
5,55
08,
090
9,92
012
,400
14,4
0016
,400
18,6
0021
,600
Qw
6,29
08,
620
10,2
0014
,000
16,8
0020
,500
23,6
0026
,800
30,3
0035
,400
117
0306
9000
WV
Cen
tral
Qs
5,88
07,
430
8,60
012
,100
14,9
0019
,100
22,8
0026
,900
31,6
0038
,800
Qr
4,48
06,
260
7,50
010
,800
13,2
0016
,400
19,0
0021
,600
24,4
0028
,300
Qw
5,84
07,
400
8,57
012
,000
14,8
0019
,000
22,5
0026
,600
31,1
0038
,000
118
0306
9500
WV
Cen
tral
Qs
16,1
0021
,000
24,9
0036
,800
46,9
0062
,500
76,4
0092
,700
112,
000
141,
000
Qr
13,7
0018
,500
21,8
0030
,400
36,4
0044
,500
50,8
0057
,400
64,2
0073
,700
Qw
16,1
0021
,000
24,9
0036
,700
46,6
0061
,800
75,4
0091
,000
109,
000
138,
000
119
0306
9850
WV
Cen
tral
Qs
48.1
65.1
77.4
113
142
183
218
256
300
365
Qr
31.8
51.4
66.3
111
147
198
240
285
333
403
Qw
43.8
62.2
7511
314
318
822
626
731
338
012
003
0698
80W
VC
entra
lQ
s59
386
51,
060
1,59
01,
990
2,55
03,
000
3,48
04,
000
4,75
0Q
r32
849
561
796
41,
230
1,59
01,
880
2,19
02,
520
2,99
0Q
w55
982
51,
010
1,49
01,
850
2,33
02,
730
3,16
03,
620
4,29
012
103
0700
00W
VC
entra
lQ
s20
,600
27,9
0033
,300
49,3
0062
,000
80,8
0097
,000
115,
000
136,
000
167,
000
Qr
17,4
0023
,400
27,4
0037
,900
45,3
0055
,200
62,8
0070
,800
79,0
0090
,600
Qw
20,5
0027
,800
33,2
0048
,900
61,4
0079
,700
95,3
0011
3,00
013
2,00
016
2,00
0
Table 3 57Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)12
203
0705
00W
VC
entra
lQ
s4,
670
6,08
07,
140
10,3
0012
,900
16,7
0020
,000
23,8
0028
,100
34,7
00Q
r4,
230
5,92
07,
090
10,3
0012
,500
15,6
0018
,000
20,5
0023
,200
26,9
00Q
w4,
660
6,08
07,
140
10,3
0012
,900
16,7
0019
,900
23,6
0027
,800
34,3
0012
303
0710
00W
VC
entra
lQ
s24
,800
35,5
0043
,100
64,3
0080
,300
103,
000
121,
000
141,
000
162,
000
194,
000
Qr
24,3
0032
,300
37,7
0051
,700
61,4
0074
,400
84,4
0094
,800
106,
000
121,
000
Qw
24,8
0035
,400
43,0
0063
,800
79,3
0010
1,00
011
9,00
013
7,00
015
8,00
018
7,00
012
403
0715
00W
VC
entra
lQ
s26
,400
38,3
0046
,300
66,9
0081
,000
99,4
0011
3,00
012
8,00
014
2,00
016
2,00
012
503
0720
00PA
Wes
tQ
s3,
920
5,86
07,
150
10,4
0012
,700
15,5
0017
,700
19,8
0022
,000
24,9
00Q
r3,
600
5,49
06,
820
10,5
0013
,000
16,4
0019
,000
21,7
0024
,400
28,1
00Q
w3,
900
5,85
07,
140
10,4
0012
,700
15,6
0017
,800
20,0
0022
,300
25,3
0012
603
0725
90PA
Wes
tQ
s38
154
265
697
41,
210
1,55
01,
820
2,12
02,
440
2,90
0Q
r47
977
499
01,
600
2,06
02,
670
3,15
03,
650
4,18
04,
900
Qw
400
575
703
1,10
01,
420
1,89
02,
270
2,67
03,
090
3,68
012
703
0754
50M
DC
entra
lQ
s12
.919
.023
.234
.843
.154
.463
.372
.782
.696
.512
803
0755
00M
DC
entra
lQ
s2,
390
3,43
04,
200
6,42
08,
170
10,7
0012
,900
15,2
0017
,900
21,8
0012
903
0756
00M
DC
entra
lQ
s14
.422
.929
.853
.675
.511
214
719
024
333
013
003
0765
05M
DC
entra
lQ
sa 7
.79
10.1
11.7
15.5
18.1
21.5
24.1
26.8
29.5
33.2
131
0307
6600
MD
Cen
tral
Qs
851
1,26
01,
550
2,31
02,
860
3,59
04,
160
4,76
05,
390
6,26
013
203
0855
00PA
Wes
tQ
s2,
850
4,34
05,
400
8,38
010
,600
13,7
0016
,300
19,0
0021
,900
26,1
00Q
r3,
930
5,98
07,
420
11,3
0014
,100
17,8
0020
,600
23,4
0026
,400
30,3
00Q
w2,
880
4,38
05,
450
8,49
010
,800
14,0
0016
,600
19,3
0022
,300
26,5
0013
303
1080
00PA
Wes
tQ
s1,
980
2,91
03,
590
5,59
07,
180
9,49
011
,500
13,6
0016
,100
19,7
00Q
r2,
970
4,56
05,
680
8,74
010
,900
13,8
0016
,000
18,3
0020
,600
23,8
00Q
w2,
010
2,95
03,
640
5,71
07,
360
9,78
011
,800
14,0
0016
,500
20,1
0013
403
1090
00O
HW
est
Qs
198
303
381
613
798
1,07
01,
300
1,56
01,
840
2,27
0Q
r22
937
848
880
61,
040
1,37
01,
630
1,90
02,
190
2,58
0Q
w20
130
938
963
583
51,
130
1,37
01,
640
1,93
02,
360
135
0310
9500
OH
Wes
tQ
s5,
050
7,35
08,
960
13,3
0016
,600
20,9
0024
,500
28,2
0032
,100
37,7
00Q
r6,
490
9,74
012
,000
18,1
0022
,400
28,0
0032
,200
36,5
0040
,900
46,8
00Q
w5,
090
7,40
09,
020
13,5
0016
,800
21,3
0025
,000
28,8
0032
,800
38,5
00
58 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)13
603
1100
00O
HW
est
Qs
1,80
02,
530
3,05
04,
540
5,68
07,
320
8,69
010
,200
11,8
0014
,300
Qr
2,57
03,
950
4,94
07,
630
9,56
012
,100
14,1
0016
,100
18,1
0021
,000
Qw
1,83
02,
570
3,10
04,
670
5,91
07,
690
9,16
010
,800
12,5
0015
,000
137
0311
0980
OH
Wes
tQ
s2.
44.
66.
512
.217
.024
.130
.237
.044
.455
.413
803
1111
50PA
Wes
tQ
s21
939
653
293
21,
240
1,68
02,
030
2,41
02,
810
3,38
013
903
1114
50O
HW
est
Qs
24.5
43.2
57.7
102
138
191
236
286
341
422
Qr
69.9
119
157
268
353
471
567
668
775
926
Qw
3455
.874
.514
220
429
637
245
454
066
314
003
1114
55O
HW
est
Qs
a 110
a 177
225
360
460
597
707
824
947
1,12
014
103
1114
70O
HW
est
Qs
21.8
43.8
62.8
129
190
289
380
487
612
811
142
0311
1500
OH
Wes
tQ
s1,
490
2,29
02,
840
4,24
05,
200
6,43
07,
370
8,31
09,
270
10,6
0014
303
1115
40O
HW
est
Qs
10.4
29.3
49.1
134
223
385
545
744
988
1,39
014
403
1115
48O
HW
est
Qs
1,32
02,
110
2,67
04,
240
5,40
07,
000
8,27
09,
620
11,0
0013
,000
Qr
1,88
02,
920
3,66
05,
710
7,19
09,
150
10,7
0012
,200
13,8
0016
,000
Qw
1,38
02,
180
2,76
04,
430
5,70
07,
460
8,86
010
,300
11,8
0013
,900
145
0311
2000
WV
Wes
tQ
s4,
900
7,36
09,
030
13,4
0016
,500
20,5
0023
,600
26,7
0029
,900
34,4
00Q
r4,
210
6,39
07,
920
12,1
0015
,000
18,9
0021
,900
24,9
0028
,000
32,2
00Q
w4,
840
7,29
08,
950
13,3
0016
,300
20,2
0023
,200
26,3
0029
,500
33,9
0014
603
1137
00W
VW
est
Qs
183
357
497
942
1,31
01,
850
2,31
02,
810
3,37
04,
180
Qr
193
320
415
688
893
1,18
01,
400
1,64
01,
880
2,23
0Q
w18
634
947
885
61,
140
1,52
01,
820
2,15
02,
490
2,99
014
703
1140
00O
HW
est
Qs
3,22
04,
920
6,09
09,
250
11,5
0014
,500
16,9
0019
,300
21,9
0025
,400
Qr
2,39
03,
690
4,61
07,
150
8,96
011
,400
13,2
0015
,100
17,1
0019
,700
Qw
3,16
04,
860
6,01
09,
090
11,3
0014
,100
16,3
0018
,700
21,1
0024
,400
148
0311
4240
OH
Wes
tQ
s20
.744
.665
133
191
280
356
441
535
674
Qr
3561
.181
.114
118
725
330
636
342
350
9Q
w24
.948
.869
.313
619
026
532
739
446
556
814
903
1145
00W
VW
est
Qs
9,21
011
,800
13,5
0017
,500
20,0
0023
,300
25,6
0028
,000
30,4
0033
,500
Qr
6,11
09,
180
11,3
0017
,100
21,2
0026
,500
30,5
0034
,600
38,8
0044
,400
Qw
9,07
011
,700
13,4
0017
,400
20,1
0023
,500
26,0
0028
,500
31,1
0034
,500
Table 3 59Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)15
003
1145
50W
VW
est
Qs
80.9
154
209
369
489
653
781
914
1,05
01,
240
Qr
51.6
88.9
117
202
267
358
432
511
594
712
Qw
70.7
135
182
303
384
493
579
672
770
909
151
0311
4600
WV
Wes
tQ
s11
619
825
741
753
268
480
192
21,
040
1,21
0Q
r66
113
149
254
335
449
540
637
739
883
Qw
9717
222
435
243
955
765
275
386
01,
010
152
0311
4650
WV
Wes
tQ
s33
862
483
41,
410
1,82
02,
350
2,75
03,
150
3,55
04,
080
Qr
170
283
367
611
795
1,05
01,
250
1,46
01,
690
2,00
0Q
w30
156
475
01,
210
1,49
01,
850
2,13
02,
410
2,71
03,
120
153
0311
5280
OH
Wes
tQ
s34
751
763
998
61,
250
1,62
01,
930
2,26
02,
620
3,15
0Q
r20
834
444
573
695
51,
260
1,50
01,
750
2,01
02,
380
Qw
296
467
583
893
1,12
01,
430
1,69
01,
960
2,26
02,
680
154
0311
5400
OH
Wes
tQ
s4,
070
5,98
07,
440
11,9
0015
,600
21,3
0026
,300
32,0
0038
,500
48,6
00Q
r3,
370
5,15
06,
410
9,83
012
,300
15,5
0017
,900
20,5
0023
,000
26,5
00Q
w4,
000
5,92
07,
370
11,7
0015
,100
20,2
0024
,400
29,2
0034
,500
42,4
0015
503
1154
10O
HW
est
Qs
a 6.0
613
.519
.940
.657
.782
.710
312
615
018
4Q
r12
21.5
29.1
51.9
70.1
96.2
118
141
166
201
Qw
7.81
15.6
22.4
44.8
63.3
89.8
111
135
159
195
156
0311
5500
OH
Wes
tQ
s4,
340
6,35
07,
690
11,2
0013
,600
16,7
0019
,100
21,6
0024
,100
27,5
00Q
r3,
940
6,00
07,
440
11,4
0014
,200
17,8
0020
,600
23,5
0026
,400
30,4
00Q
w4,
280
6,31
07,
660
11,2
0013
,700
17,0
0019
,500
22,1
0024
,800
28,4
0015
703
1155
10O
HW
est
Qs
a 110
175
224
371
488
659
804
965
1,14
01,
410
Qr
7813
317
529
739
152
262
773
885
61,
020
Qw
9816
321
034
244
358
670
382
996
61,
160
158
0311
5600
OH
Wes
tQ
s19
138
154
21,
090
1,57
02,
330
3,02
03,
800
4,70
06,
090
159
0311
5710
OH
Wes
tQ
sa 3
4.5
40.4
43.9
52.2
57.4
63.7
68.3
72.8
77.3
83.3
160
0315
0600
OH
Wes
tQ
s71
111
140
225
291
385
463
549
642
779
Qr
56.5
9712
821
929
038
946
955
364
376
9Q
w67
108
137
223
290
386
466
551
642
774
60 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)16
103
1514
00W
VW
est
Qs
2,58
03,
890
4,90
08,
040
10,7
0014
,700
18,3
0022
,400
27,2
0034
,600
Qr
2,08
03,
230
4,05
06,
290
7,91
010
,100
11,7
0013
,400
15,1
0017
,500
Qw
2,53
03,
840
4,83
07,
820
10,2
0013
,700
16,7
0019
,900
23,6
0029
,100
162
0315
1500
WV
Wes
tQ
s3,
440
4,54
05,
190
6,70
07,
620
8,71
09,
480
10,2
0010
,900
11,8
00Q
r2,
670
4,11
05,
130
7,92
09,
930
12,6
0014
,600
16,7
0018
,800
21,7
00Q
w3,
370
4,51
05,
190
6,82
07,
890
9,26
010
,300
11,3
0012
,300
13,6
0016
303
1520
00W
VW
est
Qs
6,23
08,
350
9,69
012
,900
15,0
0017
,600
19,5
0021
,400
23,3
0025
,800
Qr
5,37
08,
100
10,0
0015
,200
18,8
0023
,600
27,2
0030
,900
34,6
0039
,700
Qw
6,18
08,
340
9,70
013
,100
15,3
0018
,200
20,4
0022
,500
24,7
0027
,600
164
0315
2200
WV
Wes
tQ
s16
626
934
455
671
593
71,
120
1,31
01,
510
1,80
0Q
r12
921
628
147
261
681
697
61,
140
1,32
01,
570
Qw
158
261
334
538
688
897
1,06
01,
240
1,43
01,
700
165
0315
2500
WV
Wes
tQ
s3,
380
5,10
06,
200
8,88
010
,600
12,7
0014
,100
15,6
0017
,000
18,7
00Q
r2,
530
3,89
04,
860
7,52
09,
430
11,9
0013
,900
15,9
0017
,900
20,7
00Q
w3,
200
4,90
05,
980
8,57
010
,300
12,4
0014
,000
15,7
0017
,300
19,5
0016
603
1530
00W
VW
est
Qs
4,01
05,
850
7,01
09,
790
11,5
0013
,700
15,2
0016
,600
18,0
0019
,800
Qr
2,81
04,
330
5,39
08,
320
10,4
0013
,200
15,3
0017
,500
19,7
0022
,700
Qw
3,90
05,
740
6,90
09,
640
11,4
0013
,600
15,2
0016
,800
18,4
0020
,400
167
0315
3500
WV
Wes
tQ
s14
,000
18,0
0020
,200
25,3
0028
,200
31,5
0033
,800
35,9
0037
,800
40,3
00Q
r10
,300
15,3
0018
,700
27,9
0034
,300
42,6
0048
,800
55,1
0061
,500
70,1
00Q
w13
,800
17,9
0020
,100
25,4
0028
,600
32,5
0035
,200
37,9
0040
,400
43,6
0016
803
1540
00W
VW
est
Qs
4,58
06,
540
7,79
010
,800
12,8
0015
,300
17,0
0018
,800
20,5
0022
,800
Qr
3,31
05,
060
6,29
09,
660
12,1
0015
,200
17,7
0020
,100
22,7
0026
,100
Qw
4,51
06,
480
7,73
010
,800
12,8
0015
,300
17,1
0018
,900
20,8
0023
,200
169
0315
4250
WV
Wes
tQ
s36
354
767
199
21,
210
1,50
01,
710
1,93
02,
160
2,46
0Q
r12
621
127
546
160
379
995
51,
120
1,29
01,
540
Qw
273
447
554
791
941
1,14
01,
310
1,48
01,
660
1,92
017
003
1545
00W
VW
est
Qs
2,31
03,
050
3,52
04,
680
5,45
06,
420
7,15
07,
880
8,62
09,
620
Qr
1,60
02,
500
3,15
04,
930
6,22
07,
930
9,26
010
,600
12,0
0014
,000
Qw
2,23
03,
010
3,49
04,
710
5,55
06,
670
7,53
08,
400
9,30
010
,500
Table 3 61Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)17
103
1550
00W
VW
est
Qs
19,2
0025
,700
29,6
0038
,500
43,9
0050
,300
54,8
0059
,000
63,1
0068
,300
Qr
15,2
0022
,300
27,1
0040
,000
48,9
0060
,300
68,9
0077
,500
86,2
0098
,000
Qw
18,9
0025
,500
29,5
0038
,600
44,4
0051
,400
56,5
0061
,400
66,3
0072
,500
172
0315
5200
WV
Wes
tQ
s5,
700
7,33
08,
260
10,3
0011
,500
12,8
0013
,700
14,5
0015
,300
16,2
00Q
r3,
370
5,15
06,
410
9,83
012
,300
15,5
0017
,900
20,5
0023
,000
26,5
00Q
w5,
170
6,96
07,
960
10,2
0011
,700
13,6
0015
,100
16,5
0018
,000
19,9
0017
303
1554
50W
VW
est
Qs
350
585
748
1,18
01,
490
1,88
02,
170
2,47
02,
770
3,17
0Q
r14
924
932
354
070
493
01,
110
1,30
01,
500
1,78
0Q
w29
150
764
998
11,
190
1,46
01,
670
1,89
02,
120
2,45
017
403
1555
00W
VW
est
Qs
8,87
012
,400
14,6
0019
,900
23,3
0027
,500
30,6
0033
,600
36,5
0040
,400
Qr
6,06
09,
110
11,2
0017
,000
21,0
0026
,300
30,3
0034
,300
38,5
0044
,100
Qw
8,71
012
,300
14,5
0019
,700
23,1
0027
,400
30,5
0033
,600
36,8
0040
,900
175
0315
5525
WV
Wes
tQ
s95
51,
480
1,86
02,
930
3,73
04,
830
5,73
06,
680
7,70
09,
150
Qr
670
1,07
01,
370
2,19
02,
790
3,61
04,
250
4,91
05,
600
6,55
0Q
w86
41,
380
1,73
02,
680
3,34
04,
240
4,95
05,
710
6,50
07,
630
176
0315
9540
OH
Wes
tQ
s2,
290
3,08
03,
650
5,31
06,
610
8,51
010
,100
11,9
0013
,900
16,9
00Q
r2,
680
4,13
05,
160
7,96
09,
970
12,6
0014
,700
16,7
0018
,900
21,8
00Q
w2,
320
3,13
03,
720
5,50
06,
930
9,02
010
,800
12,7
0014
,700
17,8
0017
703
1597
00W
VW
est
Qs
7812
015
124
531
942
752
062
373
790
8Q
r43
.375
99.4
172
227
306
370
438
510
612
Qw
65.9
108
137
219
280
367
440
520
606
733
178
0317
1500
VAC
entra
lQ
s17
,800
26,1
0032
,800
54,7
0074
,200
106,
000
135,
000
171,
000
214,
000
284,
000
179
0317
3000
VAC
entra
lQ
s3,
540
5,46
06,
800
10,4
0013
,100
16,6
0019
,400
22,3
0025
,300
29,6
00Q
r6,
110
8,46
010
,100
14,4
0017
,500
21,7
0024
,900
28,3
0031
,900
36,9
00Q
w3,
590
5,51
06,
860
10,6
0013
,200
16,8
0019
,700
22,6
0025
,700
30,0
0018
003
1755
00VA
Cen
tral
Qs
2,64
04,
340
5,47
08,
260
10,1
0012
,200
13,7
0015
,200
16,6
0018
,400
Qr
4,68
06,
520
7,80
011
,200
13,7
0017
,100
19,7
0022
,400
25,3
0029
,300
Qw
2,68
04,
380
5,51
08,
350
10,2
0012
,400
14,0
0015
,500
17,0
0018
,900
62 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)18
103
1764
00W
VC
entra
lQ
s93
71,
260
1,46
01,
930
2,22
02,
570
2,82
03,
060
3,30
03,
600
Qr
1,21
01,
750
2,14
03,
210
4,00
05,
080
5,94
06,
840
7,80
09,
140
Qw
982
1,33
01,
560
2,18
02,
620
3,20
03,
630
4,07
04,
510
5,09
018
203
1765
00VA
Cen
tral
Qs
20,7
0030
,600
38,4
0063
,600
85,5
0012
0,00
015
2,00
018
9,00
023
3,00
030
4,00
018
303
1775
00W
VC
entra
lQ
sa 3
,040
3,63
03,
950
4,61
04,
980
5,38
05,
640
5,88
06,
100
6,37
0Q
r4,
020
5,63
06,
750
9,78
012
,000
14,9
0017
,200
19,6
0022
,200
25,7
00Q
w3,
180
3,86
04,
280
5,40
06,
200
7,21
07,
940
8,64
09,
320
10,2
0018
403
1777
00VA
Cen
tral
Qs
461
616
713
942
1,09
01,
270
1,40
01,
520
1,65
01,
810
Qr
965
1,41
01,
730
2,61
03,
270
4,17
04,
880
5,64
06,
430
7,56
0Q
w51
067
979
51,
130
1,37
01,
690
1,94
02,
180
2,42
02,
740
185
0317
8500
WV
Cen
tral
Qs
639
1,12
01,
460
2,40
03,
080
3,97
04,
650
5,34
06,
050
7,01
0Q
r79
31,
170
1,43
02,
180
2,73
03,
500
4,10
04,
740
5,42
06,
380
Qw
650
1,12
01,
460
2,38
03,
030
3,89
04,
560
5,24
05,
940
6,89
018
603
1790
00W
VC
entra
lQ
s4,
120
6,64
08,
270
12,2
0014
,700
17,6
0019
,600
21,5
0023
,300
25,6
00Q
r7,
880
10,8
0012
,900
18,2
0022
,100
27,2
0031
,200
35,4
0039
,800
45,9
00Q
w4,
200
6,72
08,
370
12,4
0015
,000
18,1
0020
,200
22,3
0024
,200
26,7
0018
703
1795
00W
VC
entra
lQ
s5,
590
7,62
08,
870
11,8
0013
,600
15,9
0017
,400
19,0
0020
,400
22,4
00Q
r8,
670
11,9
0014
,100
19,9
0024
,000
29,6
0033
,900
38,5
0043
,200
49,8
00Q
w5,
740
7,80
09,
100
12,3
0014
,400
17,1
0019
,000
20,9
0022
,700
25,1
0018
803
1800
00W
VC
entra
lQ
s27
,300
38,6
0047
,100
73,1
0094
,500
127,
000
156,
000
188,
000
226,
000
284,
000
189
0318
0350
WV
Cen
tral
Qs
32.4
44.3
52.9
78.5
98.8
129
154
183
215
263
Qr
37.3
6077
.212
917
022
827
632
738
346
2Q
w33
.447
57.1
89.9
118
158
193
230
272
333
190
0318
0500
WV
Cen
tral
Qs
2,84
03,
730
4,47
06,
990
9,30
013
,100
16,8
0021
,400
27,0
0036
,400
Qr
2,92
04,
120
4,97
07,
260
8,93
011
,200
13,0
0014
,800
16,8
0019
,500
Qw
2,84
03,
740
4,48
07,
000
9,28
013
,000
16,5
0020
,800
26,0
0034
,700
191
0318
0530
WV
Cen
tral
Qs
28.5
50.5
69.3
135
197
302
402
524
673
920
Qr
41.8
6786
143
188
252
305
362
422
510
Qw
31.2
53.5
72.6
138
194
282
360
449
552
711
Table 3 63Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)19
203
1806
80W
VC
entra
lQ
s45
.773
.995
.616
321
830
237
545
755
169
3Q
r48
.978
100
166
217
290
350
415
484
583
Qw
46.3
74.6
96.4
164
218
298
366
441
524
648
193
0318
1900
WV
Cen
tral
Qs
6.7
910
.414
16.4
19.4
21.7
23.9
26.2
29.3
Qr
4.07
6.98
9.28
16.6
22.6
31.5
38.9
47.1
55.9
68.8
Qw
5.93
8.52
10.1
14.8
18.3
23.4
27.6
31.9
36.4
42.8
194
0318
2000
WV
Cen
tral
Qs
3,28
04,
200
4,88
06,
860
8,43
010
,700
12,7
0014
,900
17,3
0021
,000
Qr
2,41
03,
430
4,14
06,
090
7,51
09,
440
11,0
0012
,600
14,2
0016
,600
Qw
3,18
04,
130
4,81
06,
760
8,27
010
,500
12,3
0014
,300
16,6
0019
,900
195
0318
2500
WV
Cen
tral
Qs
11,3
0015
,300
18,2
0026
,300
32,6
0041
,400
48,8
0056
,900
65,8
0078
,800
Qr
10,5
0014
,300
16,9
0023
,700
28,6
0035
,100
40,2
0045
,500
51,0
0058
,700
Qw
11,3
0015
,300
18,2
0026
,200
32,4
0041
,100
48,4
0056
,300
64,9
0077
,600
196
0318
2700
WV
Cen
tral
Qs
6,02
07,
910
9,24
013
,000
15,8
0019
,800
23,1
0026
,700
30,7
0036
,500
Qr
3,13
04,
430
5,32
07,
770
9,54
011
,900
13,8
0015
,800
17,9
0020
,800
Qw
5,65
07,
540
8,81
012
,200
14,6
0018
,100
20,9
0024
,000
27,4
0032
,300
197
0318
3000
WV
Cen
tral
Qs
1,29
02,
030
2,56
04,
020
5,09
06,
560
7,72
08,
950
10,2
0012
,100
Qr
1,85
02,
650
3,21
04,
770
5,90
07,
450
8,67
09,
950
11,3
0013
,200
Qw
1,32
02,
060
2,60
04,
080
5,17
06,
670
7,85
09,
090
10,4
0012
,200
198
0318
3500
WV
Cen
tral
Qs
20,3
0028
,600
33,9
0046
,800
55,0
0065
,200
72,6
0079
,900
87,1
0096
,600
Qr
24,5
0032
,500
37,9
0052
,000
61,8
0074
,800
84,9
0095
,400
106,
000
121,
000
Qw
20,4
0028
,600
33,9
0046
,800
55,2
0065
,500
73,0
0080
,400
87,7
0097
,300
199
0318
3550
WV
Cen
tral
Qs
187
246
280
357
402
454
490
523
555
594
Qr
114
178
225
363
469
619
741
871
1,01
01,
210
Qw
169
232
269
358
421
504
568
632
697
784
200
0318
3570
WV
Cen
tral
Qs
55.4
96.9
130
232
317
445
556
680
820
1,03
0Q
r71
.711
314
423
630
840
949
158
067
581
0Q
w58
.599
.713
323
331
443
253
164
075
993
520
103
1840
00W
VC
entra
lQ
s24
,000
31,7
0036
,700
49,2
0057
,500
68,2
0076
,200
84,4
0092
,700
104,
000
Qr
28,6
0037
,900
44,1
0060
,100
71,3
0086
,100
97,5
0010
9,00
012
2,00
013
9,00
0Q
w24
,100
31,8
0036
,800
49,4
0057
,900
68,8
0077
,100
85,4
0093
,900
106,
000
64 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)20
203
1842
00W
VC
entra
lQ
s21
042
059
91,
210
1,77
02,
650
3,44
04,
370
5,45
07,
130
Qr
230
351
439
694
888
1,16
01,
380
1,61
01,
850
2,20
0Q
w21
341
157
61,
100
1,52
02,
150
2,69
03,
300
3,99
05,
040
203
0318
4500
WV
Cen
tral
Qs
42,7
0063
,200
77,7
0011
9,00
014
9,00
019
2,00
022
7,00
026
5,00
030
6,00
036
5,00
020
403
1850
00W
VC
entra
lQ
s61
997
21,
230
1,94
02,
480
3,22
03,
830
4,47
05,
160
6,14
0Q
r1,
250
1,81
02,
210
3,32
04,
140
5,25
06,
140
7,07
08,
050
9,44
0Q
w64
61,
000
1,27
02,
030
2,61
03,
410
4,06
04,
750
5,48
06,
520
205
0318
5020
WV
Cen
tral
Qs
1122
.130
.856
.475
.810
212
314
416
719
7Q
r21
.635
.245
.777
.610
314
017
020
323
828
8Q
w12
.924
.333
.561
.884
115
140
166
193
232
206
0318
5500
WV
Cen
tral
Qs
51,7
0075
,400
91,0
0013
1,00
015
7,00
019
1,00
021
6,00
024
2,00
026
8,00
030
2,00
020
703
1860
00W
VC
entra
lQ
s50
,500
77,6
0095
,700
142,
000
174,
000
214,
000
244,
000
274,
000
304,
000
345,
000
208
0318
6500
WV
Cen
tral
Qs
4,81
06,
670
7,98
011
,700
14,5
0018
,400
21,7
0025
,200
29,1
0034
,700
Qr
2,81
03,
990
4,80
07,
030
8,65
010
,800
12,6
0014
,400
16,3
0018
,900
Qw
4,74
06,
600
7,89
011
,500
14,2
0017
,900
21,0
0024
,400
28,0
0033
,400
209
0318
7000
WV
Cen
tral
Qs
6,57
09,
290
11,2
0016
,400
20,2
0025
,500
29,8
0034
,400
39,2
0046
,300
Qr
4,92
06,
860
8,20
011
,800
14,4
0017
,900
20,6
0023
,500
26,4
0030
,600
Qw
6,52
09,
230
11,1
0016
,200
19,9
0025
,100
29,2
0033
,600
38,3
0045
,100
210
0318
7300
WV
Cen
tral
Qs
419
632
790
1,27
01,
650
2,21
02,
700
3,24
03,
850
4,78
0Q
r26
840
750
880
01,
020
1,33
01,
580
1,84
02,
120
2,52
0Q
w39
660
375
11,
170
1,50
01,
970
2,37
02,
810
3,29
04,
020
211
0318
7500
WV
Cen
tral
Qs
2,89
04,
040
4,85
07,
090
8,76
011
,100
13,0
0015
,000
17,2
0020
,400
Qr
1,84
02,
640
3,20
04,
750
5,88
07,
420
8,63
09,
910
11,3
0013
,200
Qw
2,84
03,
980
4,77
06,
930
8,52
010
,700
12,5
0014
,400
16,5
0019
,500
212
0318
9000
WV
Cen
tral
Qs
5,03
06,
920
8,36
012
,800
16,4
0022
,000
26,9
0032
,600
39,1
0049
,300
Qr
3,25
04,
590
5,52
08,
040
9,87
012
,300
14,3
0016
,300
18,5
0021
,500
Qw
4,93
06,
810
8,22
012
,400
15,8
0020
,900
25,4
0030
,400
36,2
0045
,100
213
0318
9100
WV
Cen
tral
Qs
14,7
0021
,300
25,8
0037
,800
46,4
0058
,000
67,1
0076
,600
86,6
0010
1,00
0Q
r10
,300
14,0
0016
,600
23,3
0028
,100
34,5
0039
,500
44,7
0050
,100
57,7
00Q
w14
,500
21,0
0025
,500
37,0
0045
,100
56,0
0064
,500
73,5
0082
,900
96,0
00
Table 3 65Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)21
403
1895
00W
VC
entra
lQ
s15
,500
20,5
0024
,100
34,3
0042
,100
53,2
0062
,300
72,4
0083
,400
99,6
00Q
r13
,000
17,5
0020
,700
28,9
0034
,700
42,4
0048
,400
54,7
0061
,200
70,3
00Q
w15
,400
20,4
0024
,000
34,0
0041
,600
52,3
0061
,100
70,7
0081
,200
96,6
0021
503
1896
50W
VC
entra
lQ
s86
.213
717
326
933
642
549
456
463
773
6Q
r85
133
169
276
359
475
571
672
781
937
Qw
85.9
136
172
270
343
442
521
603
689
810
216
0319
0000
WV
Cen
tral
Qs
3,88
05,
180
6,00
08,
020
9,35
011
,000
12,3
0013
,500
14,7
0016
,400
Qr
5,89
08,
160
9,73
013
,900
16,9
0021
,000
24,1
0027
,400
30,9
0035
,700
Qw
3,94
05,
250
6,09
08,
230
9,68
011
,500
12,9
0014
,300
15,7
0017
,500
217
0319
0100
WV
Cen
tral
Qs
581
1,15
01,
650
3,46
05,
190
8,10
010
,900
14,3
0018
,300
25,0
00Q
r59
888
61,
090
1,68
02,
110
2,72
03,
200
3,71
04,
240
5,01
0Q
w58
51,
090
1,52
02,
840
3,89
05,
450
6,80
08,
340
10,1
0012
,800
218
0319
0400
WV
Cen
tral
Qs
5,31
07,
430
8,91
013
,000
15,9
0020
,000
23,4
0026
,900
30,7
0036
,100
Qr
7,34
010
,100
12,0
0017
,100
20,7
0025
,500
29,3
0033
,200
37,4
0043
,100
Qw
5,39
07,
520
9,02
013
,200
16,2
0020
,500
23,9
0027
,500
31,3
0036
,800
219
0319
0500
WV
Cen
tral
Qs
202
278
324
434
504
587
646
704
760
833
Qr
124
193
244
393
508
668
799
939
1,09
01,
300
Qw
182
260
307
423
505
615
700
788
878
1,00
022
003
1914
00W
VC
entra
lQ
s86
.316
823
746
967
499
81,
290
1,63
02,
020
2,62
0Q
r11
517
922
736
647
362
474
787
81,
020
1,22
0Q
w90
.216
923
644
762
288
21,
110
1,36
01,
640
2,06
022
103
1915
00W
VC
entra
lQ
s1,
160
1,97
02,
600
4,49
06,
020
8,28
010
,200
12,3
0014
,700
18,2
00Q
r97
71,
430
1,75
02,
640
3,30
04,
210
4,93
05,
690
6,50
07,
630
Qw
1,15
01,
940
2,55
04,
310
5,68
07,
660
9,31
011
,100
13,1
0016
,100
222
0319
2000
WV
Cen
tral
Qs
26,8
0035
,500
41,3
0056
,800
67,8
0082
,700
94,5
0010
7,00
012
0,00
013
8,00
0Q
r23
,700
31,5
0036
,800
50,5
0060
,000
72,7
0082
,600
92,8
0010
3,00
011
8,00
0Q
w26
,700
35,4
0041
,100
56,4
0067
,300
81,9
0093
,400
105,
000
118,
000
136,
000
223
0319
2500
WV
Cen
tral
Qs
21,3
0030
,500
37,0
0054
,900
68,3
0086
,900
102,
000
118,
000
136,
000
161,
000
Qr
25,1
0033
,300
38,9
0053
,200
63,2
0076
,500
86,8
0097
,500
109,
000
124,
000
Qw
21,6
0030
,700
37,2
0054
,700
67,5
0085
,000
98,9
0011
4,00
012
9,00
015
2,00
0
66 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)22
403
1930
00W
VC
entra
lQ
s72
,300
103,
000
123,
000
174,
000
207,
000
249,
000
281,
000
312,
000
344,
000
387,
000
225
0319
3725
WV
Cen
tral
Qs
10.2
1518
.327
.333
.842
.649
.556
.864
.575
.2Q
r12
.120
.126
.345
.661
83.5
102
122
144
176
Qw
10.6
1619
.831
.841
.455
.266
.578
.591
.310
922
603
1938
30W
VC
entra
lQ
s11
618
023
240
857
184
01,
100
1,41
01,
800
2,43
0Q
r57
9111
619
125
033
340
247
555
366
6Q
w10
416
421
135
247
165
682
41,
020
1,25
01,
620
227
0319
4700
WV
Cen
tral
Qs
7,32
09,
850
11,7
0016
,800
20,8
0026
,500
31,2
0036
,400
42,1
0050
,600
Qr
5,49
07,
630
9,10
013
,100
15,9
0019
,700
22,7
0025
,800
29,1
0033
,600
Qw
7,27
09,
800
11,6
0016
,700
20,6
0026
,100
30,7
0035
,700
41,2
0049
,400
228
0319
5000
WV
Cen
tral
Qs
8,34
010
,100
11,1
0013
,600
15,2
0017
,000
18,4
0019
,700
21,1
0022
,800
229
0319
5100
WV
Cen
tral
Qs
1,47
02,
010
2,40
03,
520
4,38
05,
630
6,67
07,
820
9,09
011
,000
Qr
1,23
01,
790
2,18
03,
280
4,09
05,
190
6,06
06,
980
7,96
09,
330
Qw
1,42
01,
970
2,36
03,
460
4,30
05,
480
6,46
07,
520
8,66
010
,300
230
0319
5250
WV
Cen
tral
Qs
1,49
02,
060
2,46
03,
590
4,45
05,
670
6,67
07,
750
8,94
010
,700
Qr
1,12
01,
620
1,98
02,
990
3,73
04,
740
5,55
06,
400
7,29
08,
560
Qw
1,46
02,
030
2,43
03,
530
4,36
05,
530
6,49
07,
520
8,65
010
,300
231
0319
5500
WV
Cen
tral
Qs
12,6
0016
,800
19,6
0026
,900
32,1
0039
,000
44,5
0050
,200
56,2
0064
,700
Qr
10,5
0014
,300
16,9
0023
,800
28,7
0035
,200
40,3
0045
,600
51,1
0058
,800
Qw
12,5
0016
,700
19,4
0026
,600
31,7
0038
,500
43,9
0049
,500
55,4
0063
,700
232
0319
5600
WV
Cen
tral
Qs
577
773
902
1,24
01,
470
1,77
02,
010
2,25
02,
500
2,85
0Q
r18
227
935
055
871
693
81,
120
1,31
01,
510
1,80
0Q
w50
770
282
11,
100
1,30
01,
560
1,77
01,
990
2,22
02,
550
233
0319
7000
WV
Wes
tQ
s18
,100
23,5
0027
,200
37,3
0044
,600
54,5
0062
,500
71,0
0080
,000
93,0
00Q
r12
,300
18,1
0022
,100
32,8
0040
,200
49,7
0056
,900
64,2
0071
,500
81,4
00Q
w17
,600
23,1
0026
,900
36,9
0044
,000
53,8
0061
,500
69,7
0078
,300
90,5
0023
403
1971
50W
VW
est
Qs
133
187
222
312
373
452
511
572
634
718
Qr
9716
421
536
347
663
375
989
21,
030
1,23
0Q
w12
518
322
132
239
950
659
168
077
390
0
Table 3 67Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)23
503
1979
00W
VW
est
Qs
33.1
53.7
68.8
112
146
193
231
273
317
381
Qr
3357
.676
.613
317
724
029
034
440
248
3Q
w33
.154
.770
.711
915
821
426
030
936
243
623
603
1983
50W
VW
est
Qs
683
1,44
02,
120
4,57
06,
880
10,7
0014
,300
18,6
0023
,700
31,9
00Q
r1,
340
2,10
02,
650
4,17
05,
280
6,75
07,
890
9,07
010
,300
11,9
00Q
w80
71,
550
2,22
04,
450
6,28
08,
870
11,0
0013
,300
15,8
0019
,500
237
0319
8450
WV
Wes
tQ
s16
827
736
262
985
21,
190
1,49
01,
840
2,23
02,
830
Qr
272
446
575
945
1,22
01,
600
1,90
02,
210
2,54
03,
000
Qw
184
298
389
687
941
1,32
01,
630
1,98
02,
350
2,90
023
803
1985
00W
VW
est
Qs
5,32
08,
280
10,4
0016
,400
20,9
0027
,100
32,2
0037
,500
43,3
0051
,600
Qr
5,41
08,
160
10,1
0015
,300
19,0
0023
,700
27,4
0031
,100
34,9
0040
,000
Qw
5,32
08,
280
10,4
0016
,300
20,8
0026
,900
31,8
0036
,900
42,4
0050
,300
239
0319
8780
WV
Wes
tQ
s56
.294
.412
219
925
533
139
145
351
760
7Q
r95
.516
221
235
846
962
474
888
01,
020
1,21
0Q
w65
.510
713
924
032
344
253
863
874
288
624
003
1988
00W
VW
est
Qs
19.8
4976
172
258
391
507
637
781
995
Qr
68.7
117
154
263
347
464
558
658
763
912
Qw
27.5
58.9
88.3
195
287
420
530
647
772
951
241
0319
9000
WV
Wes
tQ
s4,
110
7,08
09,
290
15,7
0020
,500
27,3
0032
,700
38,5
0044
,600
53,3
00Q
r4,
070
6,19
07,
670
11,7
0014
,600
18,4
0021
,200
24,2
0027
,200
31,3
00Q
w4,
110
7,04
09,
220
15,4
0019
,900
26,1
0031
,000
36,1
0041
,600
49,2
0024
203
1993
00W
VW
est
Qs
167
317
432
762
1,01
01,
340
1,61
01,
880
2,16
02,
540
Qr
384
625
801
1,30
01,
680
2,19
02,
590
3,01
03,
440
4,05
0Q
w20
235
848
487
41,
190
1,62
01,
960
2,31
02,
680
3,17
024
303
1994
00W
VW
est
Qs
5,01
07,
920
10,0
0016
,100
20,8
0027
,300
32,7
0038
,500
44,8
0053
,800
Qr
4,62
07,
000
8,67
013
,200
16,4
0020
,600
23,8
0027
,100
30,4
0034
,900
Qw
4,92
07,
740
9,74
015
,300
19,2
0024
,500
28,5
0032
,800
37,3
0043
,600
244
0320
0500
WV
Wes
tQ
s11
,800
17,1
0020
,300
28,1
0032
,900
38,6
0042
,600
46,5
0050
,200
55,0
00Q
r9,
890
14,7
0018
,000
26,8
0032
,900
40,9
0046
,900
53,0
0059
,100
67,5
00Q
w11
,700
17,0
0020
,200
28,0
0032
,900
38,8
0043
,100
47,3
0051
,300
56,6
00
68 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)24
503
2006
00W
VW
est
Qs
43.1
6784
131
166
214
252
292
335
395
Qr
51.2
88.2
116
200
265
356
429
507
590
706
Qw
45.4
71.6
9115
120
027
133
039
145
654
724
603
2010
00W
VW
est
Qs
3,81
05,
590
6,76
09,
680
11,6
0014
,000
15,9
0017
,600
19,4
0021
,800
Qr
3,71
05,
650
7,02
010
,700
13,4
0016
,900
19,5
0022
,300
25,0
0028
,800
Qw
3,80
05,
590
6,77
09,
740
11,8
0014
,300
16,3
0018
,200
20,2
0022
,800
247
0320
1405
WV
Wes
tQ
s1,
200
1,75
02,
100
2,97
03,
530
4,22
04,
720
5,22
05,
710
6,35
0Q
r70
01,
120
1,42
02,
280
2,91
03,
760
4,42
05,
110
5,82
06,
810
Qw
1,02
01,
570
1,91
02,
720
3,26
03,
990
4,57
05,
160
5,77
06,
610
248
0320
1410
WV
Wes
tQ
s46
363
173
498
01,
140
1,32
01,
460
1,59
01,
720
1,89
0Q
r29
147
661
41,
010
1,30
01,
700
2,02
02,
350
2,70
03,
180
Qw
419
602
712
986
1,18
01,
450
1,66
01,
870
2,09
02,
390
249
0320
1420
WV
Wes
tQ
s15
922
225
934
539
745
850
054
057
862
6Q
r98
166
218
368
482
641
769
903
1,05
01,
240
Qw
140
209
249
352
427
530
612
697
783
899
250
0320
1440
WV
Wes
tQ
s16
024
130
147
661
581
798
91,
180
1,39
01,
700
Qr
5910
113
322
730
040
248
457
266
479
5Q
w12
119
825
037
946
959
570
181
794
41,
130
251
0320
1480
WV
Wes
tQ
s48
.995
.813
324
332
844
754
364
475
089
8Q
r43
.375
99.4
172
227
306
370
438
510
612
Qw
47.2
90.6
124
218
285
377
450
528
611
729
252
0320
2000
OH
Wes
tQ
s3,
570
5,01
06,
030
8,85
011
,000
13,9
0016
,300
18,9
0021
,700
25,7
0025
303
2022
45W
VW
est
Qs
a 232
a 363
458
735
949
1,26
01,
510
1,79
02,
090
2,54
0Q
r19
031
540
967
888
01,
160
1,38
01,
610
1,86
02,
200
Qw
220
352
447
717
923
1,21
01,
450
1,70
01,
970
2,35
025
403
2024
00W
VW
est
Qs
2,96
05,
820
8,18
015
,900
22,3
0032
,200
40,6
0050
,200
60,8
0076
,600
Qr
4,49
06,
810
8,43
012
,800
16,0
0020
,100
23,2
0026
,400
29,6
0034
,000
Qw
3,05
05,
870
8,19
015
,600
21,5
0030
,100
37,1
0044
,800
53,1
0065
,300
Table 3 69Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)25
503
2024
80W
VW
est
Qs
115
251
363
712
988
1,38
01,
690
2,02
02,
370
2,85
0Q
r26
042
855
390
91,
180
1,54
01,
830
2,13
02,
450
2,89
0Q
w13
226
938
374
51,
030
1,42
01,
740
2,06
02,
400
2,86
025
603
2027
50W
VW
est
Qs
2,41
03,
560
4,34
06,
400
7,87
09,
810
11,3
0012
,900
14,5
0016
,800
Qr
2,28
03,
530
4,41
06,
840
8,59
010
,900
12,7
0014
,500
16,4
0018
,900
Qw
2,40
03,
560
4,35
06,
450
7,96
010
,000
11,6
0013
,200
14,9
0017
,300
257
0320
3000
WV
Wes
tQ
s10
,200
16,3
0020
,200
30,1
0036
,500
44,3
0049
,900
55,3
0060
,600
67,3
00Q
r8,
970
13,3
0016
,400
24,5
0030
,100
37,4
0043
,000
48,6
0054
,300
62,0
00Q
w10
,100
16,2
0020
,000
29,8
0036
,000
43,5
0049
,000
54,4
0059
,700
66,5
0025
803
2036
00W
VW
est
Qs
11,2
0019
,300
24,9
0039
,400
49,0
0060
,900
69,5
0077
,900
86,1
0096
,700
Qr
9,64
014
,300
17,5
0026
,100
32,2
0040
,000
45,8
0051
,800
57,8
0066
,000
Qw
11,0
0018
,700
24,1
0037
,100
45,3
0055
,100
62,3
0069
,400
76,5
0085
,900
259
0320
4000
WV
Wes
tQ
s12
,000
18,7
0023
,000
32,9
0038
,900
45,9
0050
,600
55,1
0059
,200
64,4
00Q
r12
,900
19,0
0023
,200
34,4
0042
,100
52,1
0059
,600
67,1
0074
,800
85,1
00Q
w12
,000
18,7
0023
,000
33,0
0039
,100
46,4
0051
,500
56,3
0060
,900
66,6
0026
003
2045
00W
VW
est
Qs
3,33
05,
040
6,29
09,
940
12,8
0016
,900
20,3
0024
,100
28,2
0034
,300
Qr
3,92
05,
960
7,40
011
,300
14,1
0017
,700
20,5
0023
,400
26,3
0030
,200
Qw
3,37
05,
080
6,34
010
,000
12,9
0017
,000
20,3
0024
,000
27,9
0033
,500
261
0320
5995
OH
Wes
tQ
s62
.691
.811
317
522
429
435
441
949
159
9Q
r44
.777
.410
217
723
431
538
145
052
462
9Q
w57
.488
.611
117
622
730
336
643
450
761
426
203
2064
50W
VW
est
Qs
a 246
484
678
1,29
01,
790
2,53
03,
160
3,85
04,
600
5,70
0Q
r16
527
435
659
377
21,
020
1,22
01,
420
1,64
01,
940
Qw
215
414
567
968
1,23
01,
580
1,87
02,
170
2,50
02,
970
263
0320
6600
WV
Wes
tQ
s98
01,
460
1,77
02,
560
3,09
03,
750
4,23
04,
720
5,20
05,
850
Qr
923
1,46
01,
860
2,95
03,
750
4,82
05,
660
6,52
07,
410
8,65
0Q
w97
51,
460
1,78
02,
600
3,16
03,
900
4,46
05,
020
5,59
06,
350
264
0320
6800
WV
Wes
tQ
s2,
020
2,83
03,
390
4,87
05,
940
7,38
08,
520
9,72
011
,000
12,8
00Q
r2,
460
3,79
04,
740
7,33
09,
200
11,7
0013
,600
15,5
0017
,500
20,2
00Q
w2,
090
2,94
03,
540
5,26
06,
590
8,44
09,
910
11,4
0013
,000
15,2
00
70 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)26
503
2070
00W
VW
est
Qs
3,30
05,
160
6,48
010
,100
12,7
0016
,200
19,0
0022
,000
25,0
0029
,300
266
0320
7020
WV
Wes
tQ
s3,
330
5,18
06,
470
9,98
012
,500
15,9
0018
,500
21,3
0024
,200
28,2
00Q
r4,
420
6,71
08,
310
12,7
0015
,700
19,8
0022
,900
26,0
0029
,200
33,6
00Q
w3,
400
5,25
06,
560
10,2
0012
,800
16,4
0019
,200
22,1
0025
,000
29,2
0026
703
2074
00VA
Wes
tQ
s21
955
186
32,
010
3,07
04,
760
6,27
08,
000
9,96
012
,900
Qr
560
901
1,15
01,
850
2,37
03,
070
3,62
04,
190
4,79
05,
610
Qw
247
578
888
1,98
02,
920
4,29
05,
420
6,65
08,
000
9,96
026
803
2075
00VA
Wes
tQ
s3,
890
7,09
09,
390
15,5
0019
,800
25,2
0029
,200
33,1
0037
,000
42,1
00Q
r3,
720
5,67
07,
040
10,8
0013
,400
16,9
0019
,600
22,3
0025
,100
28,9
00Q
w3,
880
7,01
09,
250
15,1
0019
,000
23,9
0027
,500
31,0
0034
,600
39,3
0026
903
2078
00VA
Wes
tQ
s3,
400
6,41
08,
840
16,5
0022
,900
32,5
0040
,700
49,8
0060
,000
75,1
00Q
r4,
390
6,66
08,
250
12,6
0015
,600
19,7
0022
,700
25,8
0029
,000
33,4
00Q
w3,
460
6,42
08,
810
16,2
0022
,000
30,2
0037
,000
44,4
0052
,400
64,0
0027
003
2079
62K
YW
est
Qs
20.8
44.3
64.1
128
182
261
328
402
481
597
Qr
48.9
84.4
112
192
254
341
412
487
567
679
Qw
28.4
53.7
75.8
151
213
302
374
451
532
648
271
0320
8000
KY
Wes
tQ
s6,
260
9,71
012
,100
18,2
0022
,400
27,9
0032
,000
36,2
0040
,500
46,3
00Q
r5,
420
8,18
010
,100
15,3
0019
,000
23,8
0027
,400
31,2
0034
,900
40,1
00Q
w6,
180
9,60
012
,000
17,9
0021
,900
27,1
0031
,100
35,1
0039
,200
44,8
0027
203
2085
00VA
Wes
tQ
s5,
190
9,59
012
,900
22,4
0029
,400
38,9
0046
,300
54,0
0061
,900
72,8
00Q
r4,
260
6,47
08,
030
12,2
0015
,200
19,2
0022
,100
25,2
0028
,300
32,5
00Q
w5,
150
9,49
012
,700
21,8
0028
,300
36,8
0043
,400
50,2
0057
,200
66,8
0027
303
2089
50VA
Wes
tQ
s1,
040
1,83
02,
470
4,52
06,
280
9,01
011
,400
14,2
0017
,400
22,3
00Q
r1,
400
2,20
02,
770
4,35
05,
490
7,02
08,
210
9,43
010
,700
12,4
00Q
w1,
060
1,85
02,
490
4,51
06,
180
8,67
010
,800
13,2
0015
,800
19,8
0027
403
2090
00VA
Wes
tQ
s4,
630
7,44
09,
410
14,8
0018
,600
23,6
0027
,600
31,6
0035
,800
41,6
00Q
r3,
500
5,35
06,
650
10,2
0012
,700
16,0
0018
,600
21,2
0023
,800
27,4
00Q
w4,
530
7,30
09,
220
14,3
0017
,800
22,3
0025
,800
29,4
0033
,100
38,2
00
Table 3 71Ta
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)27
503
2095
75K
YW
est
Qs
164
232
282
425
538
702
841
995
1,17
01,
420
Qr
137
230
299
501
654
865
1,03
01,
210
1,40
01,
660
Qw
156
232
286
449
582
775
934
1,10
01,
290
1,55
027
603
2100
00K
YW
est
Qs
1,18
02,
020
2,59
04,
050
5,00
06,
180
7,01
07,
820
8,60
09,
600
Qr
1,23
01,
940
2,45
03,
860
4,89
06,
260
7,33
08,
420
9,56
011
,100
Qw
1,18
02,
020
2,58
04,
040
5,00
06,
180
7,05
07,
900
8,73
09,
810
277
0321
1500
KY
Wes
tQ
s2,
150
3,41
04,
270
6,59
08,
210
10,3
0012
,000
13,7
0015
,400
17,7
00Q
r3,
320
5,08
06,
320
9,70
012
,100
15,3
0017
,700
20,2
0022
,700
26,2
00Q
w2,
360
3,64
04,
560
7,22
09,
220
11,9
0014
,000
16,1
0018
,300
21,2
0027
803
2120
00K
YW
est
Qs
2,06
03,
820
5,18
09,
170
12,2
0016
,500
19,9
0023
,500
27,4
0032
,700
Qr
1,96
03,
040
3,81
05,
930
7,46
09,
490
11,1
0012
,700
14,3
0016
,600
Qw
2,05
03,
760
5,06
08,
740
11,4
0014
,900
17,6
0020
,500
23,5
0027
,600
279
0321
2750
WV
Wes
tQ
s1,
140
2,23
03,
110
5,93
08,
270
11,7
0014
,700
18,0
0021
,600
27,0
00Q
r2,
920
4,48
05,
580
8,60
010
,800
13,6
0015
,800
18,0
0020
,300
23,4
00Q
w1,
290
2,39
03,
300
6,26
08,
690
12,2
0015
,000
18,0
0021
,200
25,8
0028
003
2129
80W
VW
est
Qs
2,44
04,
170
5,38
08,
570
10,7
0013
,500
15,6
0017
,600
19,7
0022
,300
Qr
3,36
05,
130
6,38
09,
800
12,2
0015
,400
17,9
0020
,400
23,0
0026
,400
Qw
2,54
04,
250
5,47
08,
730
11,0
0013
,900
16,2
0018
,400
20,6
0023
,500
281
0321
3000
WV
Wes
tQ
s5,
500
9,49
012
,300
20,1
0025
,500
32,7
0038
,100
43,6
0049
,200
56,7
00Q
r6,
570
9,85
012
,100
18,3
0022
,600
28,3
0032
,600
36,9
0041
,300
47,3
00Q
w5,
550
9,50
012
,300
20,0
0025
,300
32,2
0037
,400
42,7
0048
,000
55,3
0028
203
2135
00W
VW
est
Qs
508
1,12
01,
640
3,40
04,
920
7,22
09,
200
11,4
0013
,800
17,4
00Q
r78
21,
250
1,58
02,
530
3,22
04,
150
4,88
05,
640
6,42
07,
490
Qw
525
1,13
01,
640
3,31
04,
680
6,64
08,
260
10,0
0011
,900
14,7
0028
303
2137
00W
VW
est
Qs
7,95
013
,300
17,4
0029
,300
38,6
0051
,900
62,9
0074
,800
87,7
0010
6,00
0Q
r10
,500
15,6
0019
,100
28,4
0034
,900
43,3
0049
,600
56,0
0062
,500
71,2
00Q
w8,
090
13,4
0017
,500
29,2
0038
,200
50,7
0060
,800
71,5
0082
,900
99,3
0028
403
2140
00W
VW
est
Qs
10,4
0018
,200
24,1
0041
,400
54,7
0073
,500
88,8
0010
5,00
012
3,00
014
8,00
0
72 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
3.
Floo
d-fre
quen
cy d
isch
arge
s fo
r the
290
U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
on
rura
l, un
regu
late
d st
ream
s in
Wes
t Virg
inia
and
adj
acen
t sta
tes.
—Co
ntin
ued
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
%, p
erce
nt; A
OP,
ann
ual-o
ccur
renc
e pr
obab
ility
; WV,
Wes
t Virg
inia
; MD
, Mar
ylan
d; V
A, V
irgin
ia; O
H, O
hio;
PA
, Pen
nsyl
vani
a; K
Y, K
entu
cky;
Eas
t, Ea
ster
n Pa
nhan
dle
Reg
ion;
Cen
tral,
Cen
tral M
ount
ains
Reg
ion;
Wes
t, W
este
rn P
late
aus R
egio
n. F
lood
-fre
quen
cy d
isch
arge
s are
pre
sent
ed in
the
follo
win
g es
timat
e-ty
pe o
rder
: firs
t lin
e (Q
s), fr
om th
e sy
stem
atic
an
d hi
stor
ical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia sk
ew (A
tkin
s and
oth
ers,
2009
); se
cond
line
(Qr),
from
the
regi
onal
ized
re
gres
sion
equ
atio
n; a
nd th
ird li
ne (Q
w),
from
wei
ghtin
g (1
) the
syst
emat
ic a
nd h
isto
rical
reco
rd u
sing
gui
delin
es e
stab
lishe
d by
the
Inte
rage
ncy
Adv
isor
y C
omm
ittee
on
Wat
er D
ata
(198
2) w
ith th
e W
est V
irgin
ia
skew
(Atk
ins a
nd o
ther
s, 20
09) a
nd (2
) the
regi
onal
ized
regr
essi
on e
quat
ion,
usi
ng th
e nu
mbe
r of y
ears
of p
eak
disc
harg
e an
d eq
uiva
lent
yea
rs o
f rec
ord.
Sha
ding
indi
cate
s the
44
stre
amga
ge st
atio
ns re
mov
ed
from
con
side
ratio
n as
par
t of t
he re
gion
al re
gres
sion
ana
lysi
s]
Iden
tifica
tion
num
ber
Stre
amga
ge
stat
ion
num
ber
Stat
eRe
gion
Estim
ate
type
Floo
d di
scha
rge,
in c
ubic
feet
per
sec
ond
1.1-
year
(9
0% A
OP)
1.5-
year
(6
7% A
OP)
2-ye
ar
(50%
AO
P)5-
year
(2
0% A
OP)
10-y
ear
(10%
AO
P)25
-yea
r (4
% A
OP)
50-y
ear
(2%
AO
P)10
0-ye
ar
(1%
AO
P)20
0-ye
ar
(0.5
% A
OP)
500-
year
(0
.2%
AO
P)28
503
2145
00W
VW
est
Qs
10,5
0018
,000
23,6
0039
,200
50,8
0066
,600
79,2
0092
,200
106,
000
125,
000
Qr
13,4
0019
,700
24,0
0035
,500
43,4
0053
,700
61,4
0069
,200
77,0
0087
,600
Qw
10,6
0018
,000
23,6
0039
,100
50,4
0065
,700
77,7
0090
,100
103,
000
121,
000
286
0321
4900
WV
Wes
tQ
s9,
240
14,9
0018
,900
30,0
0038
,200
49,3
0058
,000
67,2
0076
,900
90,4
00Q
r15
,200
22,2
0027
,000
39,8
0048
,700
60,1
0068
,600
77,2
0085
,900
97,6
00Q
w10
,100
15,7
0019
,900
31,8
0040
,600
52,4
0061
,500
70,8
0080
,200
93,2
0028
703
2155
00K
YW
est
Qs
3,21
04,
860
6,02
09,
260
11,7
0015
,000
17,6
0020
,500
23,5
0027
,800
Qr
3,45
05,
280
6,56
010
,100
12,6
0015
,800
18,4
0020
,900
23,5
0027
,100
Qw
3,22
04,
880
6,04
09,
320
11,7
0015
,100
17,7
0020
,500
23,5
0027
,700
288
0321
6500
KY
Wes
tQ
s6,
090
8,39
09,
970
14,2
0017
,300
21,6
0024
,900
28,5
0032
,300
37,8
00Q
r5,
510
8,30
010
,300
15,5
0019
,300
24,1
0027
,800
31,6
0035
,400
40,6
00Q
w6,
030
8,38
09,
990
14,4
0017
,600
22,0
0025
,500
29,2
0033
,000
38,4
0028
903
2165
40K
YW
est
Qs
582
789
929
1,30
01,
560
1,92
02,
200
2,49
02,
800
3,23
0Q
r38
462
580
11,
300
1,68
02,
190
2,59
03,
010
3,44
04,
050
Qw
540
764
910
1,30
01,
590
2,00
02,
330
2,67
03,
030
3,54
029
003
2165
63K
YW
est
Qs
111
158
190
272
330
406
465
527
590
678
Qr
5493
123
211
280
375
452
534
621
743
Qw
9013
917
125
030
939
145
953
160
771
4a D
isch
arge
was
com
pute
d ou
tsid
e th
e Pe
akFQ
com
pute
r pro
gram
(Fly
nn a
nd o
ther
s, 20
06) u
sing
the
HA
RTIV
subr
outin
e (K
irby,
198
0) a
nd b
y co
mpu
ting
the
antil
og o
f the
dis
char
ge fr
om e
quat
ion
1 (I
nter
-ag
ency
Adv
isor
y C
omm
ittee
on
Wat
er D
ata,
198
2, p
. 9–1
0).
Table 5 73Ta
ble
5.
Des
crip
tion
of th
e 88
pai
rs o
f U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s th
at w
ere
eval
uate
d to
qua
ntify
“ne
ar”
for a
pplic
atio
n of
the
drai
nage
-are
a ra
tio m
etho
d in
this
stu
dy.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
MD
, Mar
ylan
d; W
V, W
est V
irgin
ia; V
A, V
irgin
ia; P
A, P
enns
ylva
nia;
OH
, Ohi
o; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; R.,
Riv
er; B
r., B
ranc
h; F
k.,
Fork
; nr,
near
; blw
, bel
ow]
Pair
nu
mbe
r
Ups
trea
m s
tatio
nD
owns
trea
m s
tatio
n
Iden
ti-fic
atio
n nu
mbe
r
Stre
amga
ge
stat
ion
nu
mbe
rSt
atio
n na
me
Stat
eId
enti-
ficat
ion
num
ber
Stre
amga
ge
stat
ion
nu
mbe
rSt
atio
n na
me
Stat
e
11
0159
5000
Nor
th B
ranc
h Po
tom
ac R
iver
at S
teye
rM
D3
0159
5500
Nor
th B
r. Po
tom
ac R
iver
at K
itzm
iller
MD
21
0159
5000
Nor
th B
ranc
h Po
tom
ac R
iver
at S
teye
rM
D12
0160
3000
N. B
r. Po
tom
ac R
iver
nea
r Cum
berla
ndM
D3
301
5955
00N
orth
Br.
Poto
mac
Riv
er a
t Kitz
mill
erM
D4
0159
6000
Nor
th B
r. Po
tom
ac R
iver
at B
loom
ingt
onM
D4
401
5960
00N
orth
Br.
Poto
mac
Riv
er a
t Blo
omin
gton
MD
1001
6000
00N
orth
Bra
nch
Poto
mac
Riv
er a
t Pin
toM
D5
401
5960
00N
orth
Br.
Poto
mac
Riv
er a
t Blo
omin
gton
MD
1201
6030
00N
. Br.
Poto
mac
Riv
er n
ear C
umbe
rland
MD
610
0160
0000
Nor
th B
ranc
h Po
tom
ac R
iver
at P
into
MD
1201
6030
00N
. Br.
Poto
mac
Riv
er n
ear C
umbe
rland
MD
714
0160
5500
Sout
h B
ranc
h Po
tom
ac R
iver
at F
rank
linW
V17
0160
6500
S. B
r. Po
tom
ac R
iver
nea
r Pet
ersb
urg
WV
814
0160
5500
Sout
h B
ranc
h Po
tom
ac R
iver
at F
rank
linW
V23
0160
8500
S. B
r. Po
tom
ac R
iver
nea
r Spr
ingfi
eld
WV
917
0160
6500
S. B
r. Po
tom
ac R
iver
nea
r Pet
ersb
urg
WV
2301
6085
00S.
Br.
Poto
mac
Riv
er n
ear S
prin
gfiel
dW
V10
1901
6075
00S.
Fk.
S. B
r. Po
tom
ac R
. at B
rand
ywin
eW
V21
0160
8000
S. F
k. S
. Br.
Poto
mac
R. n
ear M
oore
field
WV
1126
0160
9650
Littl
e C
acap
on R
iver
at F
renc
hbur
gW
V27
0160
9800
Littl
e C
acap
on R
iver
nea
r Lev
els
WV
1231
0161
0500
Cac
apon
Riv
er a
t Yel
low
Spr
ing
WV
3201
6115
00C
acap
on R
iver
nea
r Gre
at C
acap
onW
V13
3901
6150
00O
pequ
on C
reek
nea
r Ber
ryvi
lleVA
4101
6165
00O
pequ
on C
reek
nea
r Mar
tinsb
urg
WV
1456
0163
2000
N. F
k. S
hena
ndoa
h R
. at C
oote
s Sto
reVA
6101
6330
00N
. Fk.
She
nand
oah
R. a
t Mou
nt Ja
ckso
nVA
1556
0163
2000
N. F
k. S
hena
ndoa
h R
. at C
oote
s Sto
reVA
6401
6340
00N
. Fk.
She
nand
oah
Riv
er n
ear S
trasb
urg
VA16
6101
6330
00N
. Fk.
She
nand
oah
R. a
t Mou
nt Ja
ckso
nVA
6401
6340
00N
. Fk.
She
nand
oah
Riv
er n
ear S
trasb
urg
VA17
7101
6437
00G
oose
Cre
ek n
ear M
iddl
ebur
gVA
7201
6440
00G
oose
Cre
ek n
ear L
eesb
urg
VA18
7702
0114
80B
ack
Cr.
at R
t. 60
0 ne
ar M
ount
ain
Gro
veVA
7802
0115
00B
ack
Cre
ek n
ear M
ount
ain
Gro
veVA
1983
0305
0000
Tyga
rt Va
lley
Riv
er n
ear D
aile
yW
V84
0305
0500
Tyga
rt Va
lley
Riv
er n
ear E
lkin
sW
V20
8303
0500
00Ty
gart
Valle
y R
iver
nea
r Dai
ley
WV
9603
0565
00Ty
gart
Valle
y R
iver
at F
ette
rman
WV
2184
0305
0500
Tyga
rt Va
lley
Riv
er n
ear E
lkin
sW
V86
0305
1000
Tyga
rt Va
lley
Riv
er a
t Bel
ingt
onW
V22
8603
0510
00Ty
gart
Valle
y R
iver
at B
elin
gton
WV
9203
0545
00Ty
gart
Valle
y R
iver
at P
hilli
piW
V23
8603
0510
00Ty
gart
Valle
y R
iver
at B
elin
gton
WV
9603
0565
00Ty
gart
Valle
y R
iver
at F
ette
rman
WV
2492
0305
4500
Tyga
rt Va
lley
Riv
er a
t Phi
llipi
WV
9603
0565
00Ty
gart
Valle
y R
iver
at F
ette
rman
WV
2587
0305
1500
Mid
dle
Fork
Riv
er a
t Mid
vale
WV
8803
0520
00M
iddl
e Fo
rk R
iver
at A
udra
WV
2693
0305
5020
Bon
ica
Run
on
U.S
. 250
nea
r Phi
llipi
WV
9403
0550
40B
onic
a R
un o
n R
oute
38
near
Phi
llipi
WV
2798
0305
7300
Wes
t For
k R
iver
at W
alke
rsvi
lleW
V10
003
0580
00W
est F
ork
R. b
lw S
tone
wal
l Jac
kson
Dam
nr W
esto
nW
V28
9803
0573
00W
est F
ork
Riv
er a
t Wal
kers
ville
WV
105
0306
1000
Wes
t For
k R
iver
at E
nter
pris
eW
V29
100
0305
8000
Wes
t For
k R
. blw
Sto
new
all J
acks
on D
am n
r Wes
ton
WV
101
0305
8500
Wes
t For
k R
iver
at B
utch
ervi
lleW
V30
101
0305
8500
Wes
t For
k R
iver
at B
utch
ervi
lleW
V10
203
0590
00W
est F
ork
Riv
er a
t Cla
rksb
urg
WV
74 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West VirginiaTa
ble
5.
Des
crip
tion
of th
e 88
pai
rs o
f U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s th
at w
ere
eval
uate
d to
qua
ntify
“ne
ar”
for a
pplic
atio
n of
the
drai
nage
-are
a ra
tio m
etho
d in
this
stu
dy.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
MD
, Mar
ylan
d; W
V, W
est V
irgin
ia; V
A, V
irgin
ia; P
A, P
enns
ylva
nia;
OH
, Ohi
o; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; R.,
Riv
er; B
r., B
ranc
h; F
k.,
Fork
; nr,
near
; blw
, bel
ow]
Pair
nu
mbe
r
Ups
trea
m s
tatio
nD
owns
trea
m s
tatio
n
Iden
ti-fic
atio
n nu
mbe
r
Stre
amga
ge
stat
ion
nu
mbe
rSt
atio
n na
me
Stat
eId
enti-
ficat
ion
num
ber
Stre
amga
ge
stat
ion
nu
mbe
rSt
atio
n na
me
Stat
e
3110
103
0585
00W
est F
ork
Riv
er a
t But
cher
ville
WV
105
0306
1000
Wes
t For
k R
iver
at E
nter
pris
eW
V32
102
0305
9000
Wes
t For
k R
iver
at C
lark
sbur
gW
V10
503
0610
00W
est F
ork
Riv
er a
t Ent
erpr
ise
WV
3311
003
0650
00D
ry F
ork
at H
endr
icks
WV
118
0306
9500
Che
at R
iver
nea
r Par
sons
WV
3411
003
0650
00D
ry F
ork
at H
endr
icks
WV
123
0307
1000
Che
at R
iver
nea
r Pis
gah
WV
3511
803
0695
00C
heat
Riv
er n
ear P
arso
nsW
V12
103
0700
00C
heat
Riv
er a
t Row
lesb
urg
WV
3611
803
0695
00C
heat
Riv
er n
ear P
arso
nsW
V12
303
0710
00C
heat
Riv
er n
ear P
isga
hW
V37
121
0307
0000
Che
at R
iver
at R
owle
sbur
gW
V12
303
0710
00C
heat
Riv
er n
ear P
isga
hW
V38
111
0306
5400
Bla
ckw
ater
Riv
er n
ear D
avis
WV
112
0306
6000
Bla
ckw
ater
Riv
er a
t Dav
isW
V39
114
0306
7500
Shav
ers F
ork
at C
heat
Brid
geW
V11
603
0688
00Sh
aver
s For
k be
low
Bow
den
WV
4011
403
0675
00Sh
aver
s For
k at
Che
at B
ridge
WV
118
0306
9500
Che
at R
iver
nea
r Par
sons
WV
4111
603
0688
00Sh
aver
s For
k be
low
Bow
den
WV
118
0306
9500
Che
at R
iver
nea
r Par
sons
WV
4215
403
1154
00Li
ttle
Mus
king
um R
iver
at B
loom
field
OH
156
0311
5500
Littl
e M
uski
ngum
Riv
er a
t Fay
OH
4316
103
1514
00Li
ttle
Kan
awha
Riv
er n
ear W
ildca
tW
V16
203
1515
00Li
ttle
Kan
awha
Riv
er n
ear B
urns
ville
WV
4416
103
1514
00Li
ttle
Kan
awha
Riv
er n
ear W
ildca
tW
V17
103
1550
00Li
ttle
Kan
awha
Riv
er a
t Pal
estin
eW
V45
162
0315
1500
Littl
e K
anaw
ha R
iver
nea
r Bur
nsvi
lleW
V16
303
1520
00Li
ttle
Kan
awha
Riv
er a
t Gle
nvill
eW
V46
163
0315
2000
Littl
e K
anaw
ha R
iver
at G
lenv
ille
WV
167
0315
3500
Littl
e K
anaw
ha R
iver
at G
rant
svill
eW
V47
163
0315
2000
Littl
e K
anaw
ha R
iver
at G
lenv
ille
WV
171
0315
5000
Littl
e K
anaw
ha R
iver
at P
ales
tine
WV
4816
703
1535
00Li
ttle
Kan
awha
Riv
er a
t Gra
ntsv
ille
WV
171
0315
5000
Littl
e K
anaw
ha R
iver
at P
ales
tine
WV
4917
203
1552
00So
uth
Fork
Hug
hes R
iver
at M
acfa
rlan
WV
174
0315
5500
Hug
hes R
iver
at C
isco
WV
5018
403
1777
00B
lues
tone
Riv
er a
t Blu
efiel
dVA
186
0317
9000
Blu
esto
ne R
iver
nea
r Pip
este
mW
V51
184
0317
7700
Blu
esto
ne R
iver
at B
luefi
eld
VA18
703
1795
00B
lues
tone
Riv
er a
t Lill
yW
V52
186
0317
9000
Blu
esto
ne R
iver
nea
r Pip
este
mW
V18
703
1795
00B
lues
tone
Riv
er a
t Lill
yW
V53
190
0318
0500
Gre
enbr
ier R
iver
at D
urbi
nW
V19
503
1825
00G
reen
brie
r Riv
er a
t Buc
keye
WV
5419
003
1805
00G
reen
brie
r Riv
er a
t Dur
bin
WV
201
0318
4000
Gre
enbr
ier R
iver
at H
illda
leW
V55
195
0318
2500
Gre
enbr
ier R
iver
at B
ucke
yeW
V19
803
1835
00G
reen
brie
r Riv
er a
t Ald
erso
nW
V56
195
0318
2500
Gre
enbr
ier R
iver
at B
ucke
yeW
V20
103
1840
00G
reen
brie
r Riv
er a
t Hill
dale
WV
5719
803
1835
00G
reen
brie
r Riv
er a
t Ald
erso
nW
V20
103
1840
00G
reen
brie
r Riv
er a
t Hill
dale
WV
5820
803
1865
00W
illia
ms R
iver
at D
yer
WV
209
0318
7000
Gau
ley
Riv
er a
t Cam
den
on G
aule
yW
V59
209
0318
7000
Gau
ley
Riv
er a
t Cam
den
on G
aule
yW
V21
303
1891
00G
aule
y R
iver
nea
r Cra
igsv
ille
WV
6020
903
1870
00G
aule
y R
iver
at C
amde
n on
Gau
ley
WV
223
0319
2500
Gau
ley
Riv
er a
t Bel
vaW
V
Table 5 75Ta
ble
5.
Des
crip
tion
of th
e 88
pai
rs o
f U.S
. Geo
logi
cal S
urve
y st
ream
gage
sta
tions
in W
est V
irgin
ia a
nd a
djac
ent s
tate
s th
at w
ere
eval
uate
d to
qua
ntify
“ne
ar”
for a
pplic
atio
n of
the
drai
nage
-are
a ra
tio m
etho
d in
this
stu
dy.—
Cont
inue
d
[Ide
ntifi
catio
n nu
mbe
r ref
ers t
o th
e nu
mbe
r in
figur
e 3;
MD
, Mar
ylan
d; W
V, W
est V
irgin
ia; V
A, V
irgin
ia; P
A, P
enns
ylva
nia;
OH
, Ohi
o; K
Y, K
entu
cky;
N.,
Nor
th; S
., So
uth;
E.,
East
; R.,
Riv
er; B
r., B
ranc
h; F
k.,
Fork
; nr,
near
; blw
, bel
ow]
Pair
nu
mbe
r
Ups
trea
m s
tatio
nD
owns
trea
m s
tatio
n
Iden
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76 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
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Appendix 1
78 Estimation of Flood-Frequency Discharges for Rural, Unregulated Streams in West Virginia
Appendix 1. Matrices Used to Compute Individual Standard Errors of Prediction
[PK(n_n), peak discharge for the (n.n)-year recurrence interval; PK(n), peak discharge for the (n)-year recurrence interval; %, percent; AOP, annual-occurrence probability; γ2, standard error of the model squared; numbers are given in scientific notation where 0.32483E-01 is 0.032483]
Eastern Panhandle Region
PK1_1(90%AOP) γ2 = 0.32483E-01 0.36765E-02 -0.13943E-02 -0.13943E-02 0.79153E-03
PK1_5(67%AOP) γ2 = 0.22559E-01 0.26813E-02 -0.98579E-03 -0.98579E-03 0.55605E-03
PK2(50%AOP) γ2 = 0.18489E-01 0.24610E-02 -0.86628E-03 -0.86628E-03 0.48293E-03
PK5(20%AOP) γ2 = 0.11967E-01 0.24958E-02 -0.76020E-03 -0.76020E-03 0.41065E-03
PK10(10%AOP) γ2 = 0.92526E-02 0.27016E-02 -0.75370E-03 -0.75370E-03 0.40192E-03
PK25(4%AOP) γ2 = 0.71876E-02 0.30780E-02 -0.79872E-03 -0.79872E-03 0.42199E-03
PK50(2%AOP) γ2 = 0.64308E-02 0.34417E-02 -0.86987E-03 -0.86987E-03 0.45750E-03
PK100(1%AOP) γ2 = 0.61728E-02 0.38754E-02 -0.96990E-03 -0.96990E-03 0.50843E-03
PK200(0.5%AOP) γ2 = 0.63080E-02 0.43778E-02 -0.10963E-02 -0.10963E-02 0.57352E-03
PK500(0.2%AOP) γ2 = 0.69967E-02 0.51444E-02 -0.13012E-02 -0.13012E-02 0.68008E-03
Central Mountains Region
PK1_1(90%AOP) γ2 = 0.27978E-01 0.26613E-02 -0.98361E-03 -0.98361E-03 0.47958E-03
PK1_5(67%AOP) γ2 = 0.21308E-01 0.20667E-02 -0.75807E-03 -0.75807E-03 0.36705E-03
PK2(50%AOP) γ2 = 0.19922E-01 0.20406E-02 -0.74156E-03 -0.74156E-03 0.35478E-03
PK5(20%AOP) γ2 = 0.20745E-01 0.24841E-02 -0.88266E-03 -0.88266E-03 0.41029E-03
PK10(10%AOP) γ2 = 0.23263E-01 0.29889E-02 -0.10523E-02 -0.10523E-02 0.48398E-03
PK25(4%AOP) γ2 = 0.27815E-01 0.37621E-02 -0.13163E-02 -0.13163E-02 0.60165E-03
PK50(2%AOP) γ2 = 0.31932E-01 0.44057E-02 -0.15382E-02 -0.15382E-02 0.70196E-03
PK100(1%AOP) γ2 = 0.36527E-01 0.50907E-02 -0.17758E-02 -0.17758E-02 0.81032E-03
PK200(0.5%AOP) γ2 = 0.41553E-01 0.58123E-02 -0.20274E-02 -0.20274E-02 0.92586E-03
PK500(0.2%AOP) γ2 = 0.48810E-01 0.68170E-02 -0.23795E-02 -0.23795E-02 0.10887E-02
Western Plateaus Region
PK1_1(90%AOP) γ2 = 0.25715E-01 0.21782E-02 -0.77332E-03 -0.77332E-03 0.38325E-03
PK1_5(67%AOP) γ2 = 0.19963E-01 0.16074E-02 -0.56593E-03 -0.56593E-03 0.28053E-03
PK2(50%AOP) γ2 = 0.17940E-01 0.14888E-02 -0.51918E-03 -0.51918E-03 0.25507E-03
PK5(20%AOP) γ2 = 0.15490E-01 0.15374E-02 -0.52302E-03 -0.52302E-03 0.24868E-03
PK10(10%AOP) γ2 = 0.15120E-01 0.17035E-02 -0.57249E-03 -0.57249E-03 0.26724E-03
PK25(4%AOP) γ2 = 0.15624E-01 0.19906E-02 -0.66264E-03 -0.66264E-03 0.30467E-03
PK50(2%AOP) γ2 = 0.16517E-01 0.22400E-02 -0.74298E-03 -0.74298E-03 0.33935E-03
PK100(1%AOP) γ2 = 0.17743E-01 0.25100E-02 -0.83124E-03 -0.83124E-03 0.37818E-03
PK200(0.5%AOP) γ2 = 0.19246E-01 0.27968E-02 -0.92609E-03 -0.92609E-03 0.42049E-03
PK500(0.2%AOP) γ2 = 0.21600E-01 0.31977E-02 -0.10601E-02 -0.10601E-02 0.48102E-03
For additional information, write to:DirectorU.S. Geological SurveyWest Virginia Water Science Center11 Dunbar StreetCharleston, WV 25301
or visit our Web site at:http://wv.usgs.gov/
Document prepared by the West Trenton Publishing Service Center
Wiiley, J.B. and Atkins, J.T.—
Estimation of Flood-Frequency D
ischarges for Rural, Unregulated Stream
s in West Virginia—
Scientific Investigations Report 2010–5033
Printed on recycled paper