Agincourt Solar Site Hydrologic Analysis · Agincourt Solar site.(Project) The goal of thhydrologic...

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Agincourt Solar Site Hydrologic Analysis

June 18, 2012

Submitted by the Project Applicant: AGINCOURT SOLAR, LLC P.O. Box 31159 Santa Barbara CA, 93130

Prepared for:

WDG Capital Partners P.O. Box 31159 Santa Barbara, CA 93130

Project No.: 28907132

Prepared by:

3500 Porsche Way, Suite 300 Ontario, California 91764


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TABLE OF CONTENTS

SECTION PAGE

1.0 INTRODUCTION..................................................................................................1

2.0 BACKGROUND ....................................................................................................1

3.0 PROJECT DESCRIPTION ..................................................................................3

3.1 PROJECT LOCATION AND LEGAL DESCRIPTION ...................................................4 3.2 ENVIRONEMTNAL SETTING AND SURROUNDING USES ........................................4 3.3 PROJECT LAYOUT AND CONSTRUCTION .............................................................4 3.4 EXISTING LAND USE CLASSIFICATION ................................................................8 3.5 SITE DRAINAGE ..................................................................................................9 3.6 SUPPORT PEDESTAL DRAINAGE AND EROSION DESIGN ....................................11 3.7 INCREASE IN IMPERVIOUSNESS DUE TO CONSTRUCTION .............................. 11 3.8 SPECIFIC REQUIREMENTS OF SAN BERNARDINO COUNTY .................................11

4.0 WATERSHED CHARACTERISTICS ..............................................................12

4.1 EXTENT OF WATERSHED BOUNDARY ...............................................................12 4.2 CURVE NUMBER (CN) DETERMINATION ...........................................................14 4.3 SOIL HYDROLOGIC CONDITIONS AND GROUND COVER ....................................14

4.3.1 SOIL TYPE DETERMINATION .................................................................14 4.3.2 GROUND COVER ...................................................................................17

4.4 RAINFALL DATA ...............................................................................................20 4.5 BASIN FACTOR, OR MANNING’S N VALUES .......................................................20

5.0 RUNOFF ESTIMATION ....................................................................................21

5.1 ASSUMPTIONS ...................................................................................................21 5.2 OFF-SITE HYDROLOGY—UNIT HYDROGRAPH METHOD ...................................22 5.3 ON-SITE HYDROLOGY—RATIONAL METHOD ...................................................24

6.0 RESULTS .............................................................................................................26

7.0 CONCEPTUAL DRAINAGE PLAN .................................................................27

8.0 CONCLUSIONS AND RECOMMENDATIONS .............................................29

Appendices APPENDIX A: Site Photographs APPENDIX B: Rainfall Data APPENDIX C: Off-site Hydrology APPENDIX D: On-site Pre-development Hydrology APPENDIX E: On-site Post-construction Hydrology


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References San Bernardino County Hydrology Manual List of Acronyms AC alternating current AMC antecedent moisture condition APN Assessor Parcel Number cfs cubic feet per second CUP Conditional Use Permit DEM Digital Elevation Model FEMA Federal Emergency Management Agency FIRM Flood Insurance Rate Map GIS Geographic Information System kV kilovolts NOAA National Oceanographic and Atmospheric Administration MW megawatts NRCS Natural Resources Conservation Service PC photovoltaic cell RC Resource Conservation RL Rural Living SBCHM San Bernardino County Hydrology Manual SCS Soil Conservation Service SR State Route


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Figures Figure 2-1. Project Location Map ....................................................................................... 2 Figure 3-1. Agincourt Site, Looking South ........................................................................ 3 Figure 3-2. Site Plan ........................................................................................................... 6 Figure 3-3. Typical Solar Elevation .................................................................................... 7 Figure 3-4. Jurisdictional Areas ........................................................................................ 10 Figure 4-1. Off-site Hydrology Map ................................................................................. 13 Figure 4-2. Off-site Soil Map............................................................................................ 16 Figure 4-3. Vegetation Map .............................................................................................. 19 Figure 5-1. On-site Hydrology Map ................................................................................. 25 Figure 7-1. Conceptual Drainage Plan .............................................................................. 28 Tables Table 4-1. Off-site Soil Group Designations .................................................................... 14 Table 4-2. On-site Soil Group Designations ..................................................................... 15 Table 4-3. Off-site Curve Number Determination ............................................................ 17 Table 4-4. On-site Curve Number Determination ............................................................ 17 Table 4-5. On-site Post-Development Curve Number Determination .............................. 18 Table 4-6. 100-year Rainfall Depths for Off-site Hydrology Analysis ............................ 20 Table 4-7. 100-year Rainfall Depths for On-site Hydrology Analysis ............................. 20 Table 5-1. Civil Design Input Data for Agincourt Areas 1 and 2 ..................................... 23 Table 6-1. Off-site Unit Hydrograph Results ................................................................... 26 Table 6-2. On-site Rational Method Results..................................................................... 26


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1.0 INTRODUCTION

This report presents the pre- and post-development hydrologic analyses of the proposed Agincourt Solar (Project) site. The goal of this hydrologic analysis is to evaluate the drainage impacts of the proposed Project. Results of the hydrologic analysis were used to determine whether mitigation measures that could be incorporated into the Project design would be required.

First the existing hydrological and drainage conditions of the proposed Project site were studied and analyzed. Second, post-development hydrological and drainage conditions and post-development runoff that could cause downstream impacts within the watershed were evaluated. Finally, conceptual mitigation measures suitable to mitigate the adverse impacts to the downstream watershed area were developed.

Detailed design of the Project’s drainage facilities would follow approval of the Project’s Contitional Use Permit.

2.0 BACKGROUND

The Project is being developed by Agincourt Solar, LLC (Applicant) to provide solar photovoltaic (PV) power to serve the electrical load requirements of California. The Project would generate approximately 10 megawatts (MW) of alternating current (AC) via PV cell modules on approximately 59 acres of the 79.2-acre site.

The location of the proposed Project site is shown on Figure 2-1.

The proposed Project will connect with the existing Southern California Edison (SCE) 33-kilovolt (kV) transmission line that runs north-south along Camp Rock Road (adjacent to the Project's eastern boundary) to the Cottonwood Substation, which is located 1.7 miles to the south. No new off-site transmission line is proposed. The electricity produced by the Project will be marketed to power buyers through a long-term power purchase agreement.

The Project is designed to have a useful life of approximately 20 to 30 years, although the life span could be extended by upgrades and refurbishments. In the event that the solar project is decommissioned, the facility would be removed and the site prepared for subsequent land use.


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Figure 2-1. Project Location Map


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3.0 PROJECT DESCRIPTION

The Applicant proposes to construct a PV solar facility on the approximately 79.2-acre site. The proposed site is located at Assessors Parcel Numbers (APNs) 0449-641-04 and 0449-641-27. The site is bounded by Rosewood Street to the north, Camp Rock Road directly to the east, Richard Street to the south, and Cherokee Trail directly to the west.

Figure 2-1 shows the location map of the proposed Project site, and the inset on this figure shows the project site.

The proposed Project site is situated within the Mojave Desert. The watershed slopes generally northwester, with elevations of approximately 3,351 to 8,190 feet above mean sea level, and an overall slope of approximately 14 percent. The site consists of Creosote bush-white burr sage scrub and Joshua tree woodland vegetation.

Figure 3-1 shows the proposed Project site, looking south toward the mountains. The site has a tributary watershed area of approximately 10,000 acres.

Figure 3-1. Agincourt Site, Looking South


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3.1 PROJECT LOCATION AND LEGAL DESCRIPTION The proposed Project site is situated in the western Mojave Desert, in the southern Lucerne Valley region of San Bernardino County. The site is about 5.5 miles southeast of the Lucerne Valley community. The primary access point to the Project site is from Camp Rock Road, which runs along the eastern boundary of the site. Camp Rock Road intersects State Route (SR) 18 approximately 1.7 miles south of the proposed Project site.

The proposed Project site includes the following APNs:

• 0449-641-04 (40 acres, NE/4 of NW/4, Section 34, Township 4N, Range 1E)

• 0449-641-27 (39.2 acres, S/2 of N/2 of NE/4, Section 34, Township 4N, Range 1E, excepting County 50-foot road easement

3.2 ENVIRONEMTNAL SETTING AND SURROUNDING USES The Mojave Desert is a subsection of the Basin and Range Physiographic Province, which is characterized by long, north-south-trending mountain ranges separated by broad valleys. The site is located on a broad gently sloping bajada of alluvial material originating from the San Bernardino Mountains to the south. Elevation of the project site ranges from approximately 3,340 feet above sea level (asl) at its northwest corner up to 3,446 asl at its southeast corner. The topography is generally flat, with a slope of about four percent towards the north-northwest. Numerous small braided channels cross the site.

The Project site is bordered to the north by vacant land and Rosewood Street. Land to the north of Rosewood Street is subdivided into five acre lots, but only a few of these have been developed with residences. To the west, the land is also subdivided with lot sizes ranging from 2.5 to 10 acres. Most of these lots are vacant, and about one dozen homes are located within one-half mile of the northern and western project boundaries. Immediately south of the project site are two large vacant lots. In general terms, land to the south and east is in larger lots with a lower density of development. About one dozen homes are located within one mile of the project to the south and east.

3.3 PROJECT LAYOUT AND CONSTRUCTION The proposed 79-acre solar power generation facility would be comprised of the following major components: non-reflective PV solar module arrays mounted on fixed-tilt or single-axis trackers and a racking system supported by embedded piers such as W6x9 I-beams. The site would also include approximately 10 inverters on small concrete pads, a switching station in an enclosure measuring approximately 200 by 200 feet in plan view, an unmanned communications enclosure measuring approximately 20 by 30 feet in plan view, a Conex box for equipment storage, and buried collector lines. Concrete pads would be sized and installed to accommodate associated equipment


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(inverters and switchgear). The top-of-concrete elevation would be approximately six inches above-grade-level locally to maintain flow away from the foundation.

The site plan and typical elevation are provided in Figures 3-2 and 3-3. (note: locations of solar panels and other elements within the site may be refined during final design). The layout of the solar panels would be aligned in rows in the north-south direction throughout the site. Each solar panel would be attached to embedded piers using a support structure. The rows of solar panels would be separated by access ways. Internal site circulation would include a 25-foot-wide perimeter gravel road. Maintenance roads with access to the solar panels would be improved (minimally graded, dirt or gravel) to provide truck access. Upon completion of the proposed Project, vegetation or dust palliatives may be used if needed to control wind and water erosion during operations.

No off-site improvements are anticipated with the exception of the development of site access points. Typical site access will be 25 feet wide, accommodating 75-foot turning radii in both directions. The proposed site access will include a 75-foot-long drive apron and a roadway section paved with asphalt. The actual depth of roadway sections would be determined during final design based on anticipated loading and traffic indices. However, it is anticipated that the road base course would be a minimum of six inches thick. The top course thickness would be a minimum of two inches thick.

A six foot high chain link security fence topped with one foot of barbed wire will be installed at the property setback. Signs will be installed to achieve the appropriate safety and security as expected in a solar power plant. Proposed signage includes high voltage danger signs, site under surveillance, caution electric shock, etc. Any signs as required by the National Electrical Code will be installed.

The Project’s lighting system will provide operation and maintenance personnel with illumination for both normal and emergency conditions. Lighting will be designed to provide the minimum illumination needed to achieve safety and security objectives. Lighting will be directed downward and shielded to focus illumination on the desired areas only to avoid light spillage on adjacent properties. Project lighting will be located at each inverter station and switchyard. Lighting will be no brighter than required to meet safety and security requirements, and the lamp fixtures and lumens will be selected accordingly. All project lighting will be switched and without timers.

Several part-time employees would visit the site periodically (e.g., monthly or bi-monthly) and several times a year the employees or a contractor would visit the site to wash the PV panels. Panel washing would require approximately 2 acre-feet of water per year and, based on an assumed use of medium-sized water tankers, would require approximately 130 truckloads (260 truck trips) for delivery of this water. Water would be purchased from a local purveyor. No on-site wells would be used.


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Figure 3-2. Site Plan


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Figure 3-3. Typical Solar Elevation


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Figure 3-4 shows the existing jurisdictional waters within the Project site.

3.4 EXISTING LAND USE CLASSIFICATION The project site is currently vacant. The western portion of the site (parcel 04) is zoned LV/RL-5 (Rural Living – 5 acre parcel minimum). The RL land use zoning district provides sites for rural residential uses, incidental agricultural uses, and similar and compatible uses. The easterly portion of the site is zoned LV/AG, which has a minimum 10-acre lot size and is intended for commercial agricultural operations, agriculture support services, rural residential uses and similar and compatible uses. Under County Code Chapters 82.03 and 82.04, electrical power generation is defined as a transportation, communications and infrastructure use, and is allowed in the AG and RL-5 zones upon approval of a Conditional Use Permit (CUP).


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3.5 SITE DRAINAGE A flood map search (FEMA 2011) for Federal Emergency Management Agency (FEMA) Flood Insurance Rate Map (FIRM) panel ID numbers 06071C6575H and 06071C6600H confirms the proposed Project site area has not been mapped by FEMA for flood zone hazards, and is therefore classified as an “Undetermined Risk Area.” The County of San Bernardino also has no flood zone hazard mapping for this area.

Typical of arid regions, the area experiences short-duration, high-intensity rainfall storm events producing potentially high rates of runoff when the initial infiltration rates are exceeded. During these periods the small, incised washes become conduits for water flow.

The soil in the watershed is predominantly Soil Group D. This soil type is characterized as having high runoff potential due to very slow infiltration rates when thoroughly wetted. It is expected that drainage conditions present at the site, which have been formed by past storm events, would not be disturbed and would continue to convey storm flows following project construction. Because construction essentially leaves flow patterns unaltered, mitigation is considered unnecessary for this site.

Based on visual observations during a site visit and the type of facility proposed, it is expected that the proposed solar panel construction would not significantly change offsite runoff characteristics during a major storm event. Because the imperviousness of the site would not be greatly changed as a result of the construction, the impact of increased rainfall runoff due to construction would be negligible. As noted above, the site design indicates that project construction would result in a minor (11 percent) increase in impervious surfaces at the site.

The site topography can be characterized as uniform in surface profile, with a slight slope in a northwesterly direction. Based on field observations, the site is characterized by naturally developed riverine channels that direct rainfall runoff through the site. Some of the existing drainage flow paths would be filled during the development of the site based on the final layout of the solar panels and the project’s Conceptual Drainage Plan would redirect their existing flows to other existing drainages. With incorporation of the Conceptual Drainage Plan, the proposed Project is not expected to significantly affect offsite flow patterns.

Figure 3-4 shows existing jurisdictional waters within the Project site.


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Figure 3-4. Jurisdictional Areas


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3.6 SUPPORT PEDESTAL DRAINAGE AND EROSION DESIGN The solar panels would drain freely to the ground. They would be almost parallel to the ground with a slight sloping orientation. In general, rain would run off the lower edge of the PV panel. The edge of the panel would be approximately 24 inches above the ground, and the runoff would be approximately 25 gallons in a 10-year storm (5-minute – 10-year rain event per 200 square feet of panels). This volume of water is expected to run off the panels over a 5-minute period. Based on the volume of water falling from each panel, the height of the fall, and the soil conditions, it is not expected that erosion beyond a micro level will occur. It is expected that water will fall from the PV panels and pond at a drip point before infiltrating or gradually migrating into the existing drainage patterns. If, over time, minor erosion were noted at the drip points, small gravel pads could be added to help dissipate the energy of the falling water. If minor erosion were noted near the foundations, minor grading could restore support for the individual foundations, and keep surface flows from undermining the foundations in future storm events.

3.7 INCREASE IN IMPERVIOUSNESS DUE TO CONSTRUCTION Increase in impervious area of the site due to the construction of the project embedded piers, is estimated to be minimal, approximately 11 percent.

3.8 SPECIFIC REQUIREMENTS OF SAN BERNARDINO COUNTY The proposed Project site lies within the zoning area labeled Resource Conservation (RC) within the County of San Bernardino, California. The minimum lot size for this zoning designation is 200 acres. The Project site is classified specifically as an electrical power generation project and would require a CUP from the County. A public hearing would be held to review the Project and the County Planning Commission would set the guidelines for of approval for obtaining the permit consistent with development requirements. Major factors the Commission will consider for approval include: adequate shape and size of the parcel for the type of use described, adequate access to the site, any adverse impact on abutting properties, and use of the parcel consistent with its land use classification. The minimum setbacks for this type of project are 25 feet each from the front and sides and 15 feet from the rear.

As part of the CUP process, the County would issue Conditions of Approval, which would contain a Conditional Grading Compliance section. This section would require the developer to meet the minimum standards set forth by the County for grading activities. Projects fall into this designation if the total grading exceeds 5,000 cubic yards and the Project has been conditionally approved. Other items included would be erosion control and other mitigation measures adopted as specific conditions of approval set forth by the planning commission. The grading activities would be monitored by a quality control engineer and the reports of this activity would be filed with the County Building Official, as required.


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4.0 WATERSHED CHARACTERISTICS

To evaluate the pre- and post-development conditions at the Project site, the San Bernardino County Hydrology Manual (SBCHM) and its 2010 addendum was utilized as a guide. The runoff estimates for the 100-year pre- and post-development calculations were performed in accordance with the guidelines established in the SBCHM.

4.1 EXTENT OF WATERSHED BOUNDARY Contour data at 5-foot intervals were extracted from an Intermap GIS database to determine the extent of the watershed boundary, as shown on Figure 4-1. The Digital Elevation Model (DEM) purchased from Intermap was converted to an ArcGIS shapefile using Intermap’s Global Mapper software. The 5-foot contour intervals were generated using the Intermap DEM and provided suitable accuracy for the hydrologic analysis. The shapefile is a vector file in GIS format. A third party converter, Shp to CAD software, was used to convert the shapefile to AutoCAD format. The converted file contains a set of 3-D polyline objects, which are contours with vertical elevations attached.


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Figure 4-1. Off-site Hydrology Map


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4.2 CURVE NUMBER DETERMINATION The Soil Conservation Service (SCS) Curve Number method uses a soil cover complex number for computing excess precipitation. The selection of an appropriate Curve Number is related to hydrologic Soil Group (A, B, C, or D), land use, treatment class (cover), and antecedent moisture condition (AMC). The soil group is determined from published soil maps for the area (published by the Natural Resources Conservation Service [NRCS], SCS). The 2010 Hydrology Manual Addendum for Arid Regions contained a map (Figure ADD-1) that was used for selecting the appropriate AMC for the Project area. The AMC determined from this effort was then used in selecting the appropriate SCS Curve Number.

Soil group determination is discussed further in Section 4.3.1.

4.3 SOIL HYDROLOGIC CONDITIONS AND GROUND COVER Watershed losses are attributed primarily to the soil type and the ground cover type. These two characteristics are combined to assess the soil’s potential to convey runoff. In order to determine these soil characteristics, the soil type and ground cover must first be determined.

4.3.1 Soil Type Determination The SBCHM provides maps delineating the soil types for areas that have been assessed in the County. The Soil Maps provided in the SBCHM have been superseded by the updated soil survey information conducted by the NRCS. The NRCS provides access to download the soil data for the Project vicinity in GIS format. The soil survey delineates the soil types found within the study area. The user is also provided a database that summarizes a variety of soil characteristics including the hydrologic soil group designation, by soil type. ArcGIS (Version 10) was utilized by linking the soil type with the database in order to provide the hydrologic soil group designation for watershed area.

Tables 4-1 and 4-2 summarize the hydrologic soil group designation breakdown for each sub-area within the watershed. Figure 4-2 illustrates the hydrologic soil group designations within the watershed area and Figure 5-1 illustrates on-site hydrologic sub-areas.

The soil data is available online at http://soildatamart.nrcs.usda.gov/State.aspx

Table 4-1. Off-site Soil Group Designations Hydrologic Soil Group Summary for Off-site Area (%)

Sub-area A B C D 1 10.4 14.8 10.1 64.7 2 39.5 ― ― 60.5

http://soildatamart.nrcs.usda.gov/State.aspx


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Table 4-2. On-site Soil Group Designations Hydrologic Soil Group Summary for On-site Area (%)

Sub-area A B C D 1 100 – – – 2 100 – – – 3 100 – – – 4 100 – – – 5 100 – – – 6 58.8 – – 41.2

The definitions of the hydrologic soil groups are:

Group A – Low runoff potential. Soils having high infiltration rates even when thoroughly wetted and consisting chiefly of deep, well drained sands or gravels. These soils have a high rate of water transmission.

Group B – Soils having moderate infiltration rates when thoroughly wetted and consisting chiefly of moderately deep to deep, moderately well to well-drained, sandy-loam soils with moderately-fine to moderately-coarse textures. These soils have a moderate rate of water transmission.

Group C – Soils having slow infiltration rates when thoroughly wetted, and consisting chiefly of silty loam soils with a layer that impedes downward movement of water, or soils with moderately-fine to fine texture. These soils have a slow rate of water transmission.

Group D – High runoff potential. Soils having very slow infiltration rates when thoroughly wetted and consisting chiefly of clay soils with high-swelling potential, soils with a permanent high-water table, soils with a claypan or clay layer at or near the surface, and shallow soils over nearly impervious material. These soils have a very slow rate of water transmission.

The off-site area is predominantly composed of Soil Group D in mountainous areas, with a moderate percentage of Soil Group A in the desert areas, and small percentages of soil groups B and C. Based on this soil breakdown, the off-site area has a high runoff potential due to the high percentage of Soil Group D. However, the on-site area is predominantly Soil Group A, with a moderate percentage of Soil Group D found only in sub-area 6. Therefore, the site is composed of soils that tend to have higher infiltration rates and low runoff potential.


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Figure 4-2. Off-site Soil Map


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4.3.2 Ground Cover The SBCHM provides definitions for a variety of common ground cover types that are typically found throughout the County. The ground cover type was determined by visual inspection at the proposed Project site (Figure 4-3). The SBCHM Figure C-3 provides cover type definitions as a reference in determining the area’s Curve Number.

Following a site visit, it was concluded that the watershed consisted of two ground cover types. The southern portion of the watershed, located in the San Bernardino National Forest, was determined as having barren (rockland) ground cover type. This cover type is representative for the San Bernardino National Forest because the area is predominantly covered with boulders and cobble. The area in the watershed north of the San Bernardino National Forest lies in the Lucerne Valley. This area, which includes the proposed Project site, was determined to be comprised of chaparral, broadleaf ground cover. The determination was made based on the presence of the Creosote bush-white burr sage scrub and Joshua tree woodland. Based on visual inspections during the site visit, approximately 50 to 60 percent of the ground surface appeared to be covered by vegetation. This corresponds to the definition of a “fair cover” described in the SBCHM (page C-5). The vegetation would be cleared to make room for the solar panels; therefore, for the post-construction conditions, a poor ground cover was assumed.

Based upon these determinations, an area-averaged curve number was determined for each subarea of the watershed, and are summarized in Tables 4-3, 4-4, and 4-5.

Table 4-3. Off-site Curve Number Determination Curve Number Determination Off-site Area

Sub-area Soil Types Ground Cover Type Area-Averaged Curve Number

1 A,B,C,D Chaparral, Broadleaf (Fair)

Barren 85

2 A,D Chaparral, Broadleaf (Fair)

Barren 65

Table 4-4. On-site Curve Number Determination Curve Number Determination On-site Area


1 A Chaparral, Broadleaf (Fair) 40 2 A Chaparral, Broadleaf (Fair) 40 3 A Chaparral, Broadleaf (Fair) 40 4 A Chaparral, Broadleaf (Fair) 40 5 A Chaparral, Broadleaf (Fair 40 6 A,D Chaparral, Broadleaf (Fair 57


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Table 4-5. On-site Post-Development Curve Number Determination Curve Number Determination On-site Area


1 A Barren AMC 1 60.6 2 A Barren AMC 1 60.6 3 A Barren AMC 1 60.6 4 A Barren AMC 1 60.6 5 A Barren AMC 1 60.6 6 A,D Barren AMC 1 69.8


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Figure 4-3. Vegetation Map


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4.4 RAINFALL DATA The procedure for determining point precipitation values utilized by the SBHCM has been revised by the San Bernardino Department of Public Works and published in the County of San Bernardino Hydrology Manual Addendum for Arid Regions. This addendum describes the use of the National Oceanographic and Atmospheric Administration (NOAA) Atlas 14, which was published in 2004 and revised in 2006, as a replacement for NOAA Atlas II rainfall records, published in 1973, which were the precipitation values reported in the SBCHM.

NOAA Atlas 14 information is provided at http://hdsc.nws.noaa.gov/hdsc/pfds. This website provides access to the NOAA Atlas 14 point precipitation frequency estimates by providing tabulated rainfall values for various return frequencies and durations given a specific location. Given the designated watershed boundaries as depicted on Figure 4-1, the location of the centroid for each sub-area was determined. The centroid was used as the representative location to determine the point rainfall values for each sub-area. Tables 4-6 and 4-7 provide a summary of the 100-year rainfall values determined for the watershed and the Project area for each sub-area. The NOAA 14 precipitation data can be found in Appendix B.

Table 4-6. 100-year Rainfall Depths for Off-site Hydrology Analysis 100-Year Storm Event Depths

Sub-area 5-Min (inches)

30-Min (inches)

1-Hr (inches)

3-Hr (inches)

6-Hr (inches)

24-Hr (inches)

1 0.46 1.18 1.68 2.65 3.67 7.7 2 0.363 0.913 1.24 1.8 2.31 4.26

Table 4-7. 100-year Rainfall Depths for On-site Hydrology Analysis

100-Year Storm Event Depths

Sub-area 5-Min (inches)

30-Min (inches)

1-Hr (inches)

3-Hr (inches)

6-Hr (inches)

24-Hr (inches)

1 0.359 0.891 1.2 1.73 2.21 4.08 2 0.359 0.891 1.2 1.73 2.21 4.08 3 0.359 0.891 1.2 1.73 2.21 4.08 4 0.359 0.891 1.2 1.73 2.21 4.08 5 0.360 0.895 1.21 1.74 2.22 4.09 6 0.360 0.895 1.21 1.74 2.22 4.09

4.5 BASIN FACTOR, OR MANNING’S N VALUES

The basin factor (n̄ ) is a representative value for the watershed area being analyzed. The value is estimated based on criteria listed in the SBCHM and field observations. The estimation of the basin factor requires the incorporation of four characteristics regarding the study area. These characteristics include the following:

http://hdsc.nws.noaa.gov/hdsc/pfds


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1. Slope of drainage area. Important features include uniformity of slope, ridges, canyons, and how steep the slope is (i.e. moderate vs. severe);

2. Drainage improvements in the watercourse. This is a determination of the extent of improvements in the watershed;

3. Ground Cover. The percentage and type of ground cover greatly affect the hydraulic properties of the watershed; and

4. Main watercourse features. Features of main watercourse, including improved channels, number and degree of bends, waterfalls, etc.

Figure E-2 of the SBCHM provides a summary of the characteristics of common basin factors. Based upon the site visit, a basin factor of 0.040 was established. The basin factor was established based upon a large percentage of steep mountainous area to the south, meandering watercourse, mixed ground cover and lack of drainage improvements observed in the field. These findings are consistent with Figure E-2 of the SBCHM.

5.0 RUNOFF ESTIMATION

Runoff estimation was performed in two steps. First, the runoff for the watershed contributing to the Project site was estimated and classified as off-site. Similar parameters were used to estimate the on-site runoff. The SBCHM provides specific directions on when to use the rational method or the unit hydrograph approach depending on the contributing area size. The following paragraphs provide a description of the assumptions used in developing the runoff estimates.

5.1 ASSUMPTIONS The following assumptions were made based on best engineering judgment in developing the hydrology calculations and should be revisited during detail design in the future to refine the results presented in this report:

1. Lag Methodology for unit hydrograph calculations was implemented using the empirical formula from the SBCHM for ease of use. A uniform basin factor of 0.04 was used for the entire site, which is consistent with the basin factor descriptions given on Figure E-2 of the SBCHM.

2. Rainfall intensities for the unit hydrograph were determined for the centroid of the combined on- and off-site watershed.

3. Curve numbers were determined by taking an area average for each of the sub-areas.


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4. In the post-development condition, flows from the solar panels will hit the drip line of each individual panel, travel down to the soil below, and flow in the same drainage pattern as the pre-development condition.

5. The hydrology calculations have been performed for the 100-year, 24-hour storm event only per discussions with San Bernardino County Flood District staff.

5.2 OFF-SITE HYDROLOGY—UNIT HYDROGRAPH METHOD Based on the size of the sub-watershed established for each of the tributary watershed contributing flows to the Project site, which exceeds 640 acres (1 square mile), the unit hydrograph approach was selected as the appropriate method for estimating the runoff from the watershed. The unit hydrograph method was used in determining the time distribution of runoff. The following is a summary of the steps followed to determine the unit hydrographs:

Step 1—Watershed Delineation The extent of the watershed boundary was determined using contours generated from Intermap DEM. Following the determination of the watershed boundary, AutoCAD was used to calculate the watershed area.

Step 2—Lag Methodology Lag for a watershed is the elapsed time (in hours) from the beginning of unit-effective- rainfall to the instant that the summation hydrograph for the point of concentration reached 50 percent of ultimate discharge. The SBCHM empirical formula (Equation E.2) was used for calculating the lag time because of the natural condition of the watershed.

The empirical formula requires calculations of the L (length of longest waterscourse), Lca (length along the longest watercourse, measured upstream to a point opposite the centroid of the area), and the difference in elevation between the concentration point and upstream end of the watershed. Lengths, elevations, and centroid location were determined using AutoCAD software. The lag time was determined as shown in Table 5-1.

Step 3—Selection of Manning’s “n̄ “ Value The basin factor, n̄ value is the visually estimated average basin factor from Figure E-2 of the SBCHM. Refer to Section 4.5 for a detailed description.

Step 4—Selection of S-graph A combination of the Mountain and Desert S-graphs was selected as applicable to the watershed.


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Step 5—Selection of Design Storm The 100-year, 24-hour storm event was selected as the design storm. Coordinates of the watershed sub-area’s centroid for the proposed Project site were entered into the NOAA Atlas 14 site to obtain point precipitation data.

Step 6—Determination of Precipitation Values Precipitation values were estimated as outlined in Table 4-5 in Section 4.4.

Step 7—Selection of Soil Types Soil types were estimated as outlines in Table 4-1 in Section 4.3.

Unit Hydrograph Data Input Summary Table 5-1 provides a summary of the unit hydrograph data input into Civil Design, summarized by area.

Table 5-1. Civil Design Input Data for Agincourt Areas 1 and 2

Description Area 1 Area 2 1 Enter the design storm frequency (year) 100 100 2 Enter flow length (feet) 56,909 12,196 Flow length (miles) 10.78 2.31

3 Enter the centroidal length (feet) 22,699 5,481 Centroidal length conversion (miles) 4.30 1.04

4 Enter upstream elevation 8195 4070 Enter downstream elevation 3355 3365 Elevation Difference 4840 705

5 Enter watershed area (acres) 10,541.6 466.0 6 Enter the S-graph proportions (decimal) Valley Developed - - Valley Undeveloped - - Foothill - - Mountain 0.78 Desert 0.22 1.0

7 Basin factor, n̄ 0.04 0.04 8 Enter the pervious fraction 1.0 1.0 9 Enter the area averaged Curve Number 85 64.8

10 Enter area-averaged point rainfall (inches) 5-minute 0.46 0.363 30-minute 1.18 0.913 1-Hour 1.68 1.24 3-Hour 2.65 1.8


24

Description Area 1 Area 2 6-Hour 3.67 2.31 24-Hour 7.7 4.26

5.3 ON-SITE HYDROLOGY—RATIONAL METHOD

As required by the SBCHM, due to the small size of the on-site area, less than 640 acres, the Rational Method was selected as the appropriate methodology for determining the runoff from the site. The following describes the steps used in estimating the total runoff from the site using the Rational Method.

Figure 5-1 shows the subarea delineations for the on-site analysis.

Step 1—Watershed Delineation The Project site was delineated into six sub-area tributaries to various concentration points and the areas, elevations, and flow lengths were calculated using AutoCAD.

Step 2—Selection of Design Storm The 100-year event was selected as the design storm. Coordinates for the sub-areas’ centroids were entered into the NOAA Atlas 14 site to obtain point precipitation data.

Step 3—Determination of Precipitation Values Precipitation values were estimated as described in Table 4-6 in Section 4.4.

Step 4—Selection of Soil Types Soil types were estimated as described in Table 4-2 in Section 4.3.

Step 5—Pre-development Runoff Estimate Using Civil Design The Civil Design software developed specifically according to the SBCHM was used to calculate the peak flow rates for the on-site hydrology analysis using the parameters outlined in the previous steps.

Step 6—Determination of Increased Impervious Area The increase in impervious area was determined using the site layout that is presented on Figure 3-2. The switchgear area and access roads were considered 100 percent impervious, as they will be compacted during construction. The estimated increase in imperviousness as described earlier is approximately 11 percent.

Step 7—Post-development Runoff Using Civil Design Similar to the pre-development runoff estimation, Civil Design was used to calculate the peak flow rates for the post-development condition.


25

Figure 5-1. On-site Hydrology Map


26

6.0 RESULTS

Table 6-1 below summarizes the results for the off-site hydrology analysis (Unit Hydrograph Method). The analysis allowed for the determination of the amount of off-site peak flow that would enter the proposed Project site. Based on these results, it was determined that most of the off-site area flows occur through the western half of the proposed Project site where the flow concentrates in Streams 1-8, as identified in the Jurisdictional Areas Map.

Table 6-1. Off-site Unit Hydrograph Results Off-Site Unit Hydrograph Results

Sub-area Flow Rate

(cfs) 1 8,196.7 2 413.1

Total 8,609.8 The total peak flow for the watershed tributary to the site is on the magnitude of 8,609.8 cubic feet per second (cfs). The total peak flow for the site itself is only 69.4 cfs in the pre-development condition. In the post-development condition, the peak flow for the site is 82.1 cfs. The post-development on-site increase in flow is 18.2 percent, a difference of 12.7 cfs. However, when the increase of 12.7 cfs is compared to the entire watershed of 8,609.8 cfs, the increase is only 0.15 percent. This flow is negligible compared to the flow tributary to the Project site. Therefore, there is no need to mitigate the site for this slight increase. Table 6-2 below summarizes the results for the on-site hydrology analysis.

Table 6-2. On-site Rational Method Results On-Site Hydrology Results

Sub-area

Pre-Development Condition Flow Rate

(cfs)

Post-Development Condtion Flow Rate

(cfs)

Difference Between Pre- and Post- Conditions

1 9.1 11.1 2.0 2 12.3 16.6 4.3 3 14.4 15.8 1.4 4 9.6 10.6 1.0 5 14.5 15.9 1.4 6 9.5 12.1 2.6

Total 69.4 82.1 12.73


27

7.0 CONCEPTUAL DRAINAGE PLAN

The Project’s conceptual drainage plan is illustrated on Figure 7-1. With this plan, post-development drainage patterns will not substantially alter existing flow paths and additional mitigation is not necessary. The logic used in developing this plan and details of the plan itself are summarized below.

Under existing conditions, during heavy rain events the small washes on-site become conduits for water flow. Although the watershed itself is predominantly Soil Group D, the soil type on the Project site is predominantly Soil Group A, which is characterized as having low run-off potential. It is expected that the conditions present at the site, and which have been formed by past storm events, would continue to provide passage for storm flows through the site during storm events after Project construction. Water falling on the solar units will sheet flow across the face of the solar panels, fall to the ground, and then travel in the same drainage pattern as it flows in the pre-development condition.

The solar units themselves cover a large area, but the calculated impervious footprint of the solar panel piers alone is less than one percent of the site. Adding the project roadways and equipment foundations to the piers indicates the Project would result in a 11 percent increase in impervious surface at the site.

Based on the site visit to observe the drainage patterns and the results of the runoff calculations performed as part of this study, it was determined that keeping three major watercourses (W2, W8, and W9) and redirecting the runoff from the other small watercourses (Figure 7-1) into them would maintain adequate runoff through the Project site without causing backup for flows upstream or concentrated flows downstream.

The overall goal of the conceptual drainage plan is to keep the site drainage relatively natural using bio-swales and to design the drainage channels with stream functions using construction methodology that is less intrusive to the environment. As illustrated in the conceptual drainage plan for this site, once flows from the tributary watershed reach the Project site, the flows would be divided mainly between major natural channels W2, W8, and W9 (Figure 7-1). For the benefit of maximizing constructible space on-site, a perimeter swale is proposed along the upstream (southerly) side of the site. This swale will distribute flows to channels W2, W8, and W9. Culverts will convey flows for these streams under the proposed on-site access roads and into the same streams downstream of the access roads. Some on-site sheet flow of storm waters will also occur. This is consistent with the flow patterns in the existing condition. After review and approval of the proposed conceptual drainage layout shown on Figure 7-1, the drainage plan would be refined during detailed design. Final design would determine the construction method to be utilized for the drainage channels, the necessary culverts under adjacent roads, and other features such as debris basins.


28

Figure 7-1. Conceptual Drainage Plan

29

8.0 CONCLUSIONS AND RECOMMENDATIONS

The increase in flows from the pre-development to the post-development condition at the Project site only is estimated at 69.4 cfs and 82.1 cfs, respectively. This results in an increase of 12.7 cfs in runoff across the site as a result of Project construction.

The total runoff contributory to the Project site from the upstream watershed is estimated at approximately 8,609.8 cfs. The increase in runoff as a result of the Project construction is only 12.7 cfs, approximately 0.15 percent of the total flow of 8,609.8 cfs tributary to the Project site. However, if the Project site alone is considered, the increase in runoff is approximately 18 percent from the pre-development to the post-development condition.

The increase in impervious area of the site is approximately 11 percent. Major drainage patterns will be kept as they are or as close as possible to their existing condition. Access roads at the site would utilize minimal concrete structures for culverts. Minimal solar panel footings using embedded piers would reduce the imperviousness of the site compared to using concrete footings.

These results demonstrate that the increase in runoff associated with the Project development is negligible. As a result, URS recommends the following:

1. Maintain three watercourses (W2, W8, and W9) on-site as shown on Figure 7-1, and reroute the other watercourses to W2, W8, and W9. These three watercourses were selected as they were considered to be the main drainage courses through the site and most of the minor drainages flow into the three major drainages downstream of the Project site.

2. Following approval by San Bernardino County Flood Control District, develop the conceptual plan presented in this report into a detailed design which will further refine the results of the calculations presented in this report, and provide culvert sizes, and drawings showing site drainage for construction. Mitigation measures to address debris from the upstream watershed on the northern portion of the site should be incorporated into the detail design. Possible solutions may include using debris catch-basins, designing a berm that directs the flows through the channels on-site, or reorienting the solar panels to allow debris through the site.

Use of debris basins, berms, and culverts would require annual maintenance at a minimum to ensure that these facilities remain functional during storm events and are not clogged by debris. An annual operations and maintenance plan to ensure proper function would be developed for the site drainage facilities. The plan may include use of minor construction equipment on-site on an annual basis to repair or improve the drainage facilities if needed.

Appendix A

Site Photographs

Agincourt Solar Site Hydrologic and Hydraulic Analysis

38

FIGURE A1.

FIGURE A2.


39

FIGURE A3.

FIGURE A4.


40

FIGURE A5.

FIGURE A6.


41

FIGURE A7.

FIGURE A8.


42

FIGURE A9.

FIGURE A10.


43

FIGURE A11.

FIGURE A12.

Appendix B

Rainfall Data

Off-Site Hydrology

Rainfall Data

Area 1

PF tabular

Back to Top

PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1

DurationAverage recurrence interval(years)

1 2 5 10 25 50 100 200 500 1000

5-min0.112

(0.093-0.137)0.152

(0.126-0.186)0.209

(0.172-0.257)0.259

(0.211-0.320)0.332

(0.262-0.425)0.393

(0.304-0.513)0.460

(0.347-0.615)0.533

(0.391-0.732)0.640

(0.451-0.916)0.731

(0.498-1.08)

10-min0.161

(0.133-0.197)0.218

(0.180-0.267)0.300

(0.247-0.368)0.371

(0.303-0.459)0.476

(0.376-0.609)0.564

(0.436-0.736)0.659

(0.498-0.881)0.764

(0.561-1.05)0.917

(0.646-1.31)1.05

(0.714-1.55)

15-min0.195

(0.161-0.238)0.264

(0.218-0.323)0.363

(0.298-0.445)0.449

(0.366-0.555)0.576

(0.455-0.736)0.682

(0.527-0.890)0.797

(0.602-1.07)0.923

(0.678-1.27)1.11

(0.782-1.59)1.27

(0.864-1.88)

30-min0.287

(0.238-0.351)0.389

(0.321-0.477)0.535

(0.440-0.656)0.662

(0.540-0.819)0.850

(0.671-1.09)1.01

(0.778-1.31)1.18

(0.888-1.57)1.36

(1.00-1.87)1.64

(1.15-2.34)1.87

(1.27-2.77)

60-min0.410

(0.339-0.501)0.556

(0.459-0.680)0.763

(0.628-0.937)0.944

(0.771-1.17)1.21

(0.958-1.55)1.44

(1.11-1.87)1.68

(1.27-2.24)1.94

(1.43-2.67)2.33

(1.65-3.34)2.67

(1.82-3.96)

2-hr0.582

(0.481-0.711)0.779

(0.643-0.953)1.06

(0.868-1.29)1.29

(1.06-1.60)1.64

(1.29-2.09)1.92

(1.48-2.50)2.21

(1.67-2.96)2.53

(1.86-3.48)2.99

(2.10-4.28)3.35

(2.28-4.97)

3-hr0.713

(0.590-0.872)0.950

(0.785-1.16)1.28

(1.05-1.57)1.56

(1.28-1.93)1.97

(1.56-2.52)2.30

(1.78-3.00)2.65

(2.00-3.54)3.02

(2.22-4.15)3.55

(2.50-5.08)3.97

(2.70-5.88)

6-hr1.00

(0.829-1.23)1.33

(1.10-1.63)1.79

(1.47-2.20)2.18

(1.78-2.70)2.74

(2.17-3.51)3.20

(2.47-4.17)3.67

(2.77-4.91)4.18

(3.07-5.75)4.90

(3.46-7.03)5.48

(3.73-8.12)

12-hr1.32

(1.09-1.62)1.80

(1.48-2.20)2.46

(2.03-3.02)3.03

(2.48-3.75)3.86

(3.05-4.93)4.53

(3.51-5.91)5.25

(3.96-7.02)6.02

(4.42-8.28)7.12

(5.02-10.2)8.02

(5.47-11.9)

24-hr1.75

(1.55-2.01)2.44

(2.16-2.82)3.43

(3.03-3.96)4.28

(3.75-4.99)5.53

(4.69-6.66)6.57

(5.46-8.08)7.70

(6.24-9.70)8.95

(7.05-11.6)10.8

(8.16-14.5)12.3

(9.01-17.2)

2-day2.17

(1.92-2.50)3.05

(2.70-3.51)4.31

(3.80-4.98)5.42

(4.75-6.32)7.08

(6.00-8.52)8.47

(7.03-10.4)10.0

(8.11-12.6)11.7

(9.25-15.2)14.3

(10.8-19.3)16.5

(12.1-23.1)

3-day2.38

(2.11-2.74)3.35

(2.96-3.86)4.76

(4.20-5.50)6.02

(5.27-7.01)7.89

(6.69-9.50)9.49

(7.88-11.7)11.3

(9.13-14.2)13.3

(10.5-17.2)16.3

(12.3-22.0)18.9

(13.8-26.4)

4-day2.55

(2.26-2.93)3.59

(3.18-4.14)5.13

(4.53-5.93)6.50

(5.69-7.57)8.55

(7.25-10.3)10.3

(8.55-12.7)12.3

(9.93-15.4)14.5

(11.4-18.7)17.8

(13.5-24.0)20.7

(15.1-28.9)

7-day2.87

(2.55-3.31)4.09

(3.62-4.72)5.90

(5.21-6.82)7.52

(6.58-8.76)9.95

(8.43-12.0)12.0

(9.97-14.8)14.3

(11.6-18.0)16.9

(13.3-21.8)20.7

(15.7-28.0)24.1

(17.6-33.6)

10-day3.08

(2.73-3.54)4.42

(3.91-5.10)6.41

(5.66-7.41)8.19

(7.17-9.55)10.9

(9.22-13.1)13.1

(10.9-16.2)15.6

(12.7-19.7)18.4

(14.5-23.9)22.7

(17.1-30.6)26.3

(19.2-36.6)

20-day3.65

(3.24-4.20)5.32

(4.71-6.13)7.80

(6.89-9.01)10.0

(8.77-11.7)13.3

(11.3-16.1)16.2

(13.4-19.9)19.2

(15.6-24.2)22.7

(17.9-29.3)27.7

(21.0-37.4)32.0

(23.4-44.6)

30-day4.28

(3.79-4.92)6.24

(5.52-7.19)9.16

(8.08-10.6)11.8

(10.3-13.7)15.7

(13.3-18.9)19.0

(15.8-23.3)22.6

(18.3-28.4)26.5

(20.9-34.4)32.3

(24.5-43.6)37.2

(27.2-51.9)

45-day5.08

(4.50-5.85)7.39

(6.54-8.52)10.8

(9.55-12.5)13.9

(12.2-16.2)18.5

(15.7-22.3)22.4

(18.6-27.5)26.6

(21.5-33.5)31.1

(24.6-40.3)37.8

(28.6-51.0)43.3

(31.7-60.4)

60-day5.87

(5.20-6.76)8.49

(7.51-9.78)12.4

(10.9-14.3)15.8

(13.9-18.5)21.0

(17.8-25.3)25.4

(21.1-31.2)30.1

(24.4-37.9)35.2

(27.7-45.5)42.5

(32.2-57.4)48.5

(35.5-67.7)

1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).

Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.

Please refer to NOAA Atlas 14 document for more information.

NOAA Atlas 14, Volume 6, Version 2Location name: LUCERNE VALLEY,

California, US* Coordinates: 34.3362, -116.8591

Elevation: 6339ft** source: Google Maps

POINT PRECIPITATION FREQUENCY ESTIMATES

Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, Sandra Pavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, Geoffrey

Bonnin, Daniel Brewer, Li-Chuan Chen, Tye Parzybok, John Yarchoan

NOAA, National Weather Service, Silver Spring, Maryland

PF_tabular | PF_graphical | Maps_&_aerials

Page 1 of 4Precipitation Frequency Data Server

11/10/2011http://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=34.3362&lon=-116.8591&d...

Area 2

PF tabular

Back to Top



1 2 5 10 25 50 100 200 500 1000

5-min0.092

(0.076-0.112)0.123

(0.102-0.151)0.168

(0.138-0.207)0.207

(0.169-0.257)0.265

(0.209-0.339)0.312

(0.241-0.407)0.363

(0.274-0.485)0.418

(0.307-0.574)0.496

(0.350-0.711)0.561

(0.382-0.832)

10-min0.131

(0.108-0.160)0.176

(0.146-0.216)0.241

(0.198-0.296)0.297

(0.242-0.368)0.379

(0.299-0.485)0.447

(0.346-0.584)0.520

(0.393-0.696)0.598

(0.439-0.823)0.711

(0.501-1.02)0.804

(0.548-1.19)

15-min0.159

(0.131-0.194)0.213

(0.176-0.261)0.292

(0.240-0.358)0.359

(0.293-0.445)0.459

(0.362-0.587)0.540

(0.418-0.706)0.629

(0.475-0.841)0.724

(0.531-0.995)0.860

(0.606-1.23)0.972

(0.662-1.44)

30-min0.230

(0.190-0.282)0.310

(0.255-0.379)0.423

(0.348-0.520)0.521

(0.425-0.645)0.666

(0.526-0.852)0.784

(0.607-1.03)0.913

(0.689-1.22)1.05

(0.771-1.45)1.25

(0.880-1.79)1.41

(0.961-2.09)

60-min0.313

(0.258-0.383)0.421

(0.347-0.516)0.575

(0.473-0.707)0.708

(0.578-0.877)0.905

(0.714-1.16)1.07

(0.824-1.39)1.24

(0.936-1.66)1.43

(1.05-1.96)1.70

(1.20-2.43)1.92

(1.31-2.84)

2-hr0.420

(0.347-0.514)0.557

(0.459-0.682)0.749

(0.616-0.920)0.913

(0.745-1.13)1.15

(0.909-1.47)1.35

(1.04-1.76)1.55

(1.17-2.07)1.76

(1.29-2.42)2.06

(1.45-2.95)2.29

(1.56-3.40)

3-hr0.500

(0.413-0.612)0.659

(0.543-0.807)0.880

(0.723-1.08)1.07

(0.873-1.33)1.34

(1.06-1.72)1.57

(1.21-2.05)1.80

(1.36-2.40)2.04

(1.50-2.81)2.38

(1.68-3.41)2.64

(1.80-3.91)

6-hr0.654

(0.540-0.800)0.858

(0.708-1.05)1.14

(0.939-1.40)1.39

(1.13-1.72)1.73

(1.37-2.22)2.01

(1.56-2.63)2.31

(1.74-3.09)2.61

(1.92-3.60)3.04

(2.14-4.36)3.37

(2.29-4.99)

12-hr0.791

(0.654-0.968)1.07

(0.885-1.31)1.47

(1.21-1.80)1.80

(1.47-2.23)2.29

(1.80-2.92)2.67

(2.07-3.49)3.08

(2.33-4.12)3.51

(2.58-4.83)4.10

(2.89-5.88)4.57

(3.12-6.78)

24-hr0.973

(0.863-1.12)1.38

(1.22-1.58)1.94

(1.71-2.24)2.42

(2.12-2.81)3.11

(2.63-3.74)3.67

(3.05-4.51)4.26

(3.46-5.37)4.91

(3.87-6.35)5.83

(4.41-7.86)6.57

(4.81-9.17)

2-day1.13

(0.997-1.30)1.61

(1.43-1.86)2.31

(2.04-2.67)2.90

(2.54-3.38)3.75

(3.18-4.51)4.44

(3.69-5.46)5.19

(4.20-6.53)5.99

(4.73-7.76)7.16

(5.42-9.65)8.11

(5.93-11.3)

3-day1.20

(1.07-1.38)1.73

(1.54-2.00)2.51

(2.21-2.90)3.17

(2.77-3.69)4.10

(3.48-4.94)4.87

(4.05-5.99)5.70

(4.62-7.17)6.60

(5.20-8.55)7.92

(5.99-10.7)9.02

(6.59-12.6)

4-day1.26

(1.12-1.45)1.83

(1.62-2.10)2.66

(2.35-3.08)3.38

(2.96-3.93)4.40

(3.73-5.29)5.23

(4.34-6.43)6.13

(4.97-7.72)7.12

(5.61-9.21)8.56

(6.48-11.5)9.75

(7.13-13.6)

7-day1.34

(1.19-1.55)1.99

(1.76-2.30)2.96

(2.61-3.42)3.80

(3.33-4.42)5.01

(4.25-6.04)6.00

(4.98-7.38)7.05

(5.72-8.88)8.19

(6.46-10.6)9.84

(7.44-13.3)11.2

(8.17-15.6)

10-day1.39

(1.23-1.60)2.10

(1.86-2.42)3.17

(2.80-3.66)4.10

(3.59-4.77)5.47

(4.63-6.58)6.57

(5.46-8.08)7.75

(6.28-9.76)9.02

(7.11-11.7)10.9

(8.22-14.6)12.3

(9.02-17.2)

20-day1.52

(1.34-1.75)2.39

(2.12-2.75)3.73

(3.29-4.31)4.91

(4.30-5.72)6.69

(5.67-8.06)8.16

(6.77-10.0)9.71

(7.87-12.2)11.4

(8.97-14.7)13.7

(10.4-18.5)15.5

(11.4-21.7)

30-day1.68

(1.49-1.93)2.68

(2.37-3.08)4.24

(3.75-4.91)5.66

(4.95-6.59)7.80

(6.61-9.39)9.56

(7.94-11.8)11.4

(9.25-14.4)13.4

(10.5-17.3)16.1

(12.2-21.7)18.2

(13.3-25.4)

45-day1.90

(1.68-2.18)3.07

(2.72-3.54)4.91

(4.34-5.68)6.61

(5.79-7.70)9.21

(7.81-11.1)11.4

(9.45-14.0)13.7

(11.1-17.2)16.0

(12.6-20.7)19.3

(14.6-26.0)21.8

(15.9-30.4)

60-day2.08

(1.84-2.39)3.37

(2.98-3.88)5.46

(4.82-6.31)7.38

(6.47-8.60)10.3

(8.75-12.4)12.8

(10.6-15.7)15.4

(12.5-19.4)18.1

(14.3-23.4)21.8

(16.5-29.4)24.5

(17.9-34.3)














On-Site Hydrology

Rainfall Data

Area 1

PF tabular

Back to Top



1 2 5 10 25 50 100 200 500 1000

5-min0.091

(0.075-0.112)0.122

(0.101-0.150)0.167

(0.137-0.205)0.206

(0.168-0.255)0.262

(0.207-0.336)0.309

(0.239-0.403)0.359

(0.271-0.480)0.412

(0.303-0.567)0.489

(0.345-0.701)0.552

(0.376-0.818)

10-min0.131

(0.108-0.160)0.176

(0.145-0.215)0.240

(0.197-0.294)0.295

(0.240-0.365)0.376

(0.297-0.481)0.442

(0.342-0.578)0.514

(0.388-0.688)0.591

(0.434-0.813)0.701

(0.494-1.00)0.791

(0.539-1.17)

15-min0.158

(0.130-0.193)0.212

(0.175-0.260)0.290

(0.238-0.356)0.356

(0.291-0.441)0.455

(0.359-0.582)0.535

(0.414-0.699)0.622

(0.469-0.832)0.715

(0.525-0.983)0.847

(0.597-1.22)0.956

(0.651-1.42)

30-min0.227

(0.187-0.277)0.304

(0.251-0.373)0.416

(0.342-0.510)0.511

(0.417-0.633)0.652

(0.515-0.834)0.767

(0.593-1.00)0.891

(0.673-1.19)1.03

(0.752-1.41)1.22

(0.856-1.74)1.37

(0.934-2.03)

60-min0.305

(0.252-0.373)0.410

(0.338-0.502)0.559

(0.460-0.687)0.688

(0.561-0.852)0.878

(0.693-1.12)1.03

(0.798-1.35)1.20

(0.906-1.61)1.38

(1.01-1.90)1.64

(1.15-2.34)1.85

(1.26-2.74)

2-hr0.408

(0.337-0.500)0.540

(0.445-0.661)0.725

(0.596-0.891)0.883

(0.721-1.09)1.11

(0.878-1.42)1.30

(1.00-1.70)1.49

(1.13-2.00)1.70

(1.25-2.34)1.98

(1.40-2.84)2.21

(1.50-3.27)

3-hr0.485

(0.400-0.593)0.637

(0.525-0.781)0.850

(0.699-1.04)1.03

(0.842-1.28)1.30

(1.02-1.66)1.51

(1.17-1.97)1.73

(1.31-2.32)1.97

(1.44-2.71)2.29

(1.61-3.28)2.53

(1.73-3.75)

6-hr0.632

(0.521-0.773)0.827

(0.682-1.01)1.10

(0.904-1.35)1.33

(1.09-1.65)1.67

(1.32-2.13)1.93

(1.50-2.53)2.21

(1.67-2.96)2.51

(1.84-3.45)2.92

(2.05-4.18)3.22

(2.20-4.78)

12-hr0.761

(0.628-0.932)1.03

(0.850-1.26)1.41

(1.16-1.73)1.73

(1.41-2.14)2.19

(1.73-2.80)2.56

(1.98-3.34)2.95

(2.22-3.94)3.35

(2.46-4.61)3.91

(2.76-5.61)4.35

(2.97-6.46)

24-hr0.936

(0.830-1.08)1.32

(1.17-1.52)1.86

(1.65-2.15)2.32

(2.03-2.70)2.98

(2.53-3.59)3.51

(2.92-4.32)4.08

(3.31-5.13)4.68

(3.69-6.06)5.55

(4.20-7.49)6.25

(4.57-8.72)

2-day1.08

(0.959-1.25)1.55

(1.38-1.79)2.22

(1.96-2.57)2.79

(2.44-3.25)3.60

(3.05-4.33)4.26

(3.53-5.23)4.96

(4.02-6.24)5.72

(4.51-7.41)6.81

(5.15-9.18)7.69

(5.62-10.7)

3-day1.16

(1.03-1.33)1.67

(1.48-1.93)2.42

(2.14-2.80)3.05

(2.67-3.55)3.95

(3.35-4.75)4.68

(3.88-5.75)5.46

(4.42-6.87)6.31

(4.97-8.17)7.54

(5.70-10.2)8.56

(6.26-11.9)

4-day1.21

(1.07-1.39)1.76

(1.56-2.03)2.57

(2.27-2.97)3.25

(2.85-3.79)4.23

(3.58-5.09)5.02

(4.17-6.17)5.87

(4.76-7.39)6.80

(5.36-8.80)8.14

(6.16-11.0)9.25

(6.76-12.9)

7-day1.28

(1.14-1.48)1.91

(1.69-2.20)2.84

(2.51-3.28)3.64

(3.19-4.24)4.80

(4.07-5.78)5.74

(4.77-7.06)6.73

(5.46-8.48)7.81

(6.15-10.1)9.34

(7.07-12.6)10.6

(7.74-14.8)

10-day1.32

(1.17-1.52)2.01

(1.78-2.31)3.03

(2.68-3.50)3.92

(3.44-4.57)5.23

(4.43-6.30)6.28

(5.22-7.72)7.40

(6.00-9.32)8.59

(6.77-11.1)10.3

(7.81-13.9)11.7

(8.55-16.3)

20-day1.43

(1.27-1.65)2.27

(2.01-2.61)3.56

(3.14-4.11)4.69

(4.11-5.47)6.40

(5.43-7.71)7.80

(6.48-9.59)9.28

(7.52-11.7)10.9

(8.56-14.1)13.0

(9.87-17.6)14.8

(10.8-20.6)

30-day1.58

(1.40-1.82)2.53

(2.24-2.92)4.04

(3.57-4.67)5.40

(4.73-6.29)7.46

(6.33-8.98)9.15

(7.60-11.2)10.9

(8.85-13.7)12.8

(10.1-16.5)15.4

(11.6-20.7)17.3

(12.7-24.2)

45-day1.78

(1.58-2.05)2.90

(2.57-3.34)4.68

(4.13-5.41)6.31

(5.53-7.35)8.82

(7.48-10.6)10.9

(9.07-13.4)13.1

(10.6-16.5)15.4

(12.1-19.9)18.5

(14.0-24.9)20.8

(15.2-29.1)

60-day1.93

(1.71-2.22)3.17

(2.81-3.66)5.19

(4.58-5.99)7.04

(6.17-8.20)9.88

(8.37-11.9)12.3

(10.2-15.1)14.8

(12.0-18.6)17.4

(13.7-22.5)20.9

(15.8-28.2)23.5

(17.2-32.8)














Area 2

PF tabular

Back to Top



1 2 5 10 25 50 100 200 500 1000

5-min0.091

(0.075-0.112)0.122

(0.101-0.150)0.167

(0.137-0.205)0.206

(0.168-0.255)0.262

(0.207-0.336)0.309

(0.239-0.403)0.359

(0.271-0.480)0.412

(0.303-0.567)0.489

(0.345-0.701)0.552

(0.376-0.818)

10-min0.131

(0.108-0.160)0.176

(0.145-0.215)0.240

(0.197-0.294)0.295

(0.240-0.365)0.376

(0.297-0.481)0.442

(0.342-0.578)0.514

(0.388-0.688)0.591

(0.434-0.813)0.701

(0.494-1.00)0.791

(0.539-1.17)

15-min0.158

(0.130-0.193)0.212

(0.175-0.260)0.290

(0.238-0.356)0.356

(0.291-0.441)0.455

(0.359-0.582)0.535

(0.414-0.699)0.622

(0.469-0.832)0.715

(0.525-0.983)0.847

(0.597-1.22)0.956

(0.651-1.42)

30-min0.227

(0.187-0.277)0.304

(0.251-0.373)0.416

(0.342-0.510)0.511

(0.417-0.633)0.652

(0.515-0.834)0.767

(0.593-1.00)0.891

(0.673-1.19)1.03

(0.752-1.41)1.22

(0.856-1.74)1.37

(0.934-2.03)

60-min0.305

(0.252-0.373)0.410

(0.338-0.502)0.559

(0.460-0.687)0.688

(0.561-0.852)0.878

(0.693-1.12)1.03

(0.798-1.35)1.20

(0.906-1.61)1.38

(1.01-1.90)1.64

(1.15-2.34)1.85

(1.26-2.74)

2-hr0.408

(0.337-0.500)0.540

(0.445-0.661)0.725

(0.596-0.891)0.883

(0.721-1.09)1.11

(0.878-1.42)1.30

(1.00-1.70)1.49

(1.13-2.00)1.70

(1.25-2.34)1.98

(1.40-2.84)2.21

(1.50-3.27)

3-hr0.485

(0.400-0.593)0.637

(0.525-0.781)0.850

(0.699-1.04)1.03

(0.842-1.28)1.30

(1.02-1.66)1.51

(1.17-1.97)1.73

(1.31-2.32)1.97

(1.44-2.71)2.29

(1.61-3.28)2.53

(1.73-3.75)

6-hr0.632

(0.521-0.773)0.827

(0.682-1.01)1.10

(0.904-1.35)1.33

(1.09-1.65)1.67

(1.32-2.13)1.93

(1.50-2.53)2.21

(1.67-2.96)2.51

(1.84-3.45)2.92

(2.05-4.18)3.22

(2.20-4.78)

12-hr0.761

(0.628-0.932)1.03

(0.850-1.26)1.41

(1.16-1.73)1.73

(1.41-2.14)2.19

(1.73-2.80)2.56

(1.98-3.34)2.95

(2.22-3.94)3.35

(2.46-4.61)3.91

(2.76-5.61)4.35

(2.97-6.46)

24-hr0.936

(0.830-1.08)1.32

(1.17-1.52)1.86

(1.65-2.15)2.32

(2.03-2.70)2.98

(2.53-3.59)3.51

(2.92-4.32)4.08

(3.31-5.13)4.68

(3.69-6.06)5.55

(4.20-7.49)6.25

(4.57-8.72)

2-day1.08

(0.959-1.25)1.55

(1.38-1.79)2.22

(1.96-2.57)2.79

(2.44-3.25)3.60

(3.05-4.33)4.26

(3.53-5.23)4.96

(4.02-6.24)5.72

(4.51-7.41)6.81

(5.15-9.18)7.69

(5.62-10.7)

3-day1.16

(1.03-1.33)1.67

(1.48-1.93)2.42

(2.14-2.80)3.05

(2.67-3.55)3.95

(3.35-4.75)4.68

(3.88-5.75)5.46

(4.42-6.87)6.31

(4.97-8.17)7.54

(5.70-10.2)8.56

(6.26-11.9)

4-day1.21

(1.07-1.39)1.76

(1.56-2.03)2.57

(2.27-2.97)3.25

(2.85-3.79)4.23

(3.58-5.09)5.02

(4.17-6.17)5.87

(4.76-7.39)6.80

(5.36-8.80)8.14

(6.16-11.0)9.25

(6.76-12.9)

7-day1.28

(1.14-1.48)1.91

(1.69-2.20)2.84

(2.51-3.28)3.64

(3.19-4.24)4.80

(4.07-5.78)5.74

(4.77-7.06)6.73

(5.46-8.48)7.81

(6.15-10.1)9.34

(7.07-12.6)10.6

(7.74-14.8)

10-day1.32

(1.17-1.52)2.01

(1.78-2.31)3.03

(2.68-3.50)3.92

(3.44-4.57)5.23

(4.43-6.30)6.28

(5.22-7.72)7.40

(6.00-9.32)8.59

(6.77-11.1)10.3

(7.81-13.9)11.7

(8.55-16.3)

20-day1.43

(1.27-1.65)2.27

(2.01-2.61)3.56

(3.14-4.11)4.69

(4.11-5.47)6.40

(5.43-7.71)7.80

(6.48-9.59)9.28

(7.52-11.7)10.9

(8.56-14.1)13.0

(9.87-17.6)14.8

(10.8-20.6)

30-day1.58

(1.40-1.82)2.53

(2.24-2.92)4.04

(3.57-4.67)5.40

(4.73-6.29)7.46

(6.33-8.98)9.15

(7.60-11.2)10.9

(8.85-13.7)12.8

(10.1-16.5)15.4

(11.6-20.7)17.3

(12.7-24.2)

45-day1.78

(1.58-2.05)2.90

(2.57-3.34)4.68

(4.13-5.41)6.31

(5.53-7.35)8.82

(7.48-10.6)10.9

(9.07-13.4)13.1

(10.6-16.5)15.4

(12.1-19.9)18.5

(14.0-24.9)20.8

(15.2-29.1)

60-day1.93

(1.71-2.22)3.17

(2.81-3.66)5.19

(4.58-5.99)7.04

(6.17-8.20)9.88

(8.37-11.9)12.3

(10.2-15.1)14.8

(12.0-18.6)17.4

(13.7-22.5)20.9

(15.8-28.2)23.5

(17.2-32.8)














Area 3

PF tabular

Back to Top



1 2 5 10 25 50 100 200 500 1000

5-min0.091

(0.075-0.112)0.122

(0.101-0.150)0.167

(0.137-0.205)0.206

(0.168-0.255)0.262

(0.207-0.336)0.309

(0.239-0.403)0.359

(0.271-0.480)0.412

(0.303-0.567)0.489

(0.345-0.701)0.552

(0.376-0.818)

10-min0.131

(0.108-0.160)0.176

(0.145-0.215)0.240

(0.197-0.294)0.295

(0.240-0.365)0.376

(0.297-0.481)0.442

(0.342-0.578)0.514

(0.388-0.688)0.591

(0.434-0.813)0.701

(0.494-1.00)0.791

(0.539-1.17)

15-min0.158

(0.130-0.193)0.212

(0.175-0.260)0.290

(0.238-0.356)0.356

(0.291-0.441)0.455

(0.359-0.582)0.535

(0.414-0.699)0.622

(0.469-0.832)0.715

(0.525-0.983)0.847

(0.597-1.22)0.956

(0.651-1.42)

30-min0.227

(0.187-0.277)0.304

(0.251-0.373)0.416

(0.342-0.510)0.511

(0.417-0.633)0.652

(0.515-0.834)0.767

(0.593-1.00)0.891

(0.673-1.19)1.03

(0.752-1.41)1.22

(0.856-1.74)1.37

(0.934-2.03)

60-min0.305

(0.252-0.373)0.410

(0.338-0.502)0.559

(0.460-0.687)0.688

(0.561-0.852)0.878

(0.693-1.12)1.03

(0.798-1.35)1.20

(0.906-1.61)1.38

(1.01-1.90)1.64

(1.15-2.34)1.85

(1.26-2.74)

2-hr0.408

(0.337-0.500)0.540

(0.445-0.661)0.725

(0.596-0.891)0.883

(0.721-1.09)1.11

(0.878-1.42)1.30

(1.00-1.70)1.49

(1.13-2.00)1.70

(1.25-2.34)1.98

(1.40-2.84)2.21

(1.50-3.27)

3-hr0.485

(0.400-0.593)0.637

(0.525-0.781)0.850

(0.699-1.04)1.03

(0.842-1.28)1.30

(1.02-1.66)1.51

(1.17-1.97)1.73

(1.31-2.32)1.97

(1.44-2.71)2.29

(1.61-3.28)2.53

(1.73-3.75)

6-hr0.632

(0.521-0.773)0.827

(0.682-1.01)1.10

(0.904-1.35)1.33

(1.09-1.65)1.67

(1.32-2.13)1.93

(1.50-2.53)2.21

(1.67-2.96)2.51

(1.84-3.45)2.92

(2.05-4.18)3.22

(2.20-4.78)

12-hr0.761

(0.628-0.932)1.03

(0.850-1.26)1.41

(1.16-1.73)1.73

(1.41-2.14)2.19

(1.73-2.80)2.56

(1.98-3.34)2.95

(2.22-3.94)3.35

(2.46-4.61)3.91

(2.76-5.61)4.35

(2.97-6.46)

24-hr0.936

(0.830-1.08)1.32

(1.17-1.52)1.86

(1.65-2.15)2.32

(2.03-2.70)2.98

(2.53-3.59)3.51

(2.92-4.32)4.08

(3.31-5.13)4.68

(3.69-6.06)5.55

(4.20-7.49)6.25

(4.57-8.72)

2-day1.08

(0.959-1.25)1.55

(1.38-1.79)2.22

(1.96-2.57)2.79

(2.44-3.25)3.60

(3.05-4.33)4.26

(3.53-5.23)4.96

(4.02-6.24)5.72

(4.51-7.41)6.81

(5.15-9.18)7.69

(5.62-10.7)

3-day1.16

(1.03-1.33)1.67

(1.48-1.93)2.42

(2.14-2.80)3.05

(2.67-3.55)3.95

(3.35-4.75)4.68

(3.88-5.75)5.46

(4.42-6.87)6.31

(4.97-8.17)7.54

(5.70-10.2)8.56

(6.26-11.9)

4-day1.21

(1.07-1.39)1.76

(1.56-2.03)2.57

(2.27-2.97)3.25

(2.85-3.79)4.23

(3.58-5.09)5.02

(4.17-6.17)5.87

(4.76-7.39)6.80

(5.36-8.80)8.14

(6.16-11.0)9.25

(6.76-12.9)

7-day1.28

(1.14-1.48)1.91

(1.69-2.20)2.84

(2.51-3.28)3.64

(3.19-4.24)4.80

(4.07-5.78)5.74

(4.77-7.06)6.73

(5.46-8.48)7.81

(6.15-10.1)9.34

(7.07-12.6)10.6

(7.74-14.8)

10-day1.32

(1.17-1.52)2.01

(1.78-2.31)3.03

(2.68-3.50)3.92

(3.44-4.57)5.23

(4.43-6.30)6.28

(5.22-7.72)7.40

(6.00-9.32)8.59

(6.77-11.1)10.3

(7.81-13.9)11.7

(8.55-16.3)

20-day1.43

(1.27-1.65)2.27

(2.01-2.61)3.56

(3.14-4.11)4.69

(4.11-5.47)6.40

(5.43-7.71)7.80

(6.48-9.59)9.28

(7.52-11.7)10.9

(8.56-14.1)13.0

(9.87-17.6)14.8

(10.8-20.6)

30-day1.58

(1.40-1.82)2.53

(2.24-2.92)4.04

(3.57-4.67)5.40

(4.73-6.29)7.46

(6.33-8.98)9.15

(7.60-11.2)10.9

(8.85-13.7)12.8

(10.1-16.5)15.4

(11.6-20.7)17.3

(12.7-24.2)

45-day1.78

(1.58-2.05)2.90

(2.57-3.34)4.68

(4.13-5.41)6.31

(5.53-7.35)8.82

(7.48-10.6)10.9

(9.07-13.4)13.1

(10.6-16.5)15.4

(12.1-19.9)18.5

(14.0-24.9)20.8

(15.2-29.1)

60-day1.93

(1.71-2.22)3.17

(2.81-3.66)5.19

(4.58-5.99)7.04

(6.17-8.20)9.88

(8.37-11.9)12.3

(10.2-15.1)14.8

(12.0-18.6)17.4

(13.7-22.5)20.9

(15.8-28.2)23.5

(17.2-32.8)














Area 4

PF tabular

Back to Top



1 2 5 10 25 50 100 200 500 1000

5-min0.091

(0.075-0.112)0.122

(0.101-0.150)0.167

(0.137-0.205)0.206

(0.168-0.255)0.262

(0.207-0.336)0.309

(0.239-0.403)0.359

(0.271-0.480)0.412

(0.303-0.567)0.489

(0.345-0.701)0.552

(0.376-0.818)

10-min0.131

(0.108-0.160)0.176

(0.145-0.215)0.240

(0.197-0.294)0.295

(0.240-0.365)0.376

(0.297-0.481)0.442

(0.342-0.578)0.514

(0.388-0.688)0.591

(0.434-0.813)0.701

(0.494-1.00)0.791

(0.539-1.17)

15-min0.158

(0.130-0.193)0.212

(0.175-0.260)0.290

(0.238-0.356)0.356

(0.291-0.441)0.455

(0.359-0.582)0.535

(0.414-0.699)0.622

(0.469-0.832)0.715

(0.525-0.983)0.847

(0.597-1.22)0.956

(0.651-1.42)

30-min0.227

(0.187-0.277)0.304

(0.251-0.373)0.416

(0.342-0.510)0.511

(0.417-0.633)0.652

(0.515-0.834)0.767

(0.593-1.00)0.891

(0.673-1.19)1.03

(0.752-1.41)1.22

(0.856-1.74)1.37

(0.934-2.03)

60-min0.305

(0.252-0.373)0.410

(0.338-0.502)0.559

(0.460-0.687)0.688

(0.561-0.852)0.878

(0.693-1.12)1.03

(0.798-1.35)1.20

(0.906-1.61)1.38

(1.01-1.90)1.64

(1.15-2.34)1.85

(1.26-2.74)

2-hr0.408

(0.337-0.500)0.540

(0.445-0.661)0.725

(0.596-0.891)0.883

(0.721-1.09)1.11

(0.878-1.42)1.30

(1.00-1.70)1.49

(1.13-2.00)1.70

(1.25-2.34)1.98

(1.40-2.84)2.21

(1.50-3.27)

3-hr0.485

(0.400-0.593)0.637

(0.525-0.781)0.850

(0.699-1.04)1.03

(0.842-1.28)1.30

(1.02-1.66)1.51

(1.17-1.97)1.73

(1.31-2.32)1.97

(1.44-2.71)2.29

(1.61-3.28)2.53

(1.73-3.75)

6-hr0.632

(0.521-0.773)0.827

(0.682-1.01)1.10

(0.904-1.35)1.33

(1.09-1.65)1.67

(1.32-2.13)1.93

(1.50-2.53)2.21

(1.67-2.96)2.51

(1.84-3.45)2.92

(2.05-4.18)3.22

(2.20-4.78)

12-hr0.761

(0.628-0.932)1.03

(0.850-1.26)1.41

(1.16-1.73)1.73

(1.41-2.14)2.19

(1.73-2.80)2.56

(1.98-3.34)2.95

(2.22-3.94)3.35

(2.46-4.61)3.91

(2.76-5.61)4.35

(2.97-6.46)

24-hr0.936

(0.830-1.08)1.32

(1.17-1.52)1.86

(1.65-2.15)2.32

(2.03-2.70)2.98

(2.53-3.59)3.51

(2.92-4.32)4.08

(3.31-5.13)4.68

(3.69-6.06)5.55

(4.20-7.49)6.25

(4.57-8.72)

2-day1.08

(0.959-1.25)1.55

(1.38-1.79)2.22

(1.96-2.57)2.79

(2.44-3.25)3.60

(3.05-4.33)4.26

(3.53-5.23)4.96

(4.02-6.24)5.72

(4.51-7.41)6.81

(5.15-9.18)7.69

(5.62-10.7)

3-day1.16

(1.03-1.33)1.67

(1.48-1.93)2.42

(2.14-2.80)3.05

(2.67-3.55)3.95

(3.35-4.75)4.68

(3.88-5.75)5.46

(4.42-6.87)6.31

(4.97-8.17)7.54

(5.70-10.2)8.56

(6.26-11.9)

4-day1.21

(1.07-1.39)1.76

(1.56-2.03)2.57

(2.27-2.97)3.25

(2.85-3.79)4.23

(3.58-5.09)5.02

(4.17-6.17)5.87

(4.76-7.39)6.80

(5.36-8.80)8.14

(6.16-11.0)9.25

(6.76-12.9)

7-day1.28

(1.14-1.48)1.91

(1.69-2.20)2.84

(2.51-3.28)3.64

(3.19-4.24)4.80

(4.07-5.78)5.74

(4.77-7.06)6.73

(5.46-8.48)7.81

(6.15-10.1)9.34

(7.07-12.6)10.6

(7.74-14.8)

10-day1.32

(1.17-1.52)2.01

(1.78-2.31)3.03

(2.68-3.50)3.92

(3.44-4.57)5.23

(4.43-6.30)6.28

(5.22-7.72)7.40

(6.00-9.32)8.59

(6.77-11.1)10.3

(7.81-13.9)11.7

(8.55-16.3)

20-day1.43

(1.27-1.65)2.27

(2.01-2.61)3.56

(3.14-4.11)4.69

(4.11-5.47)6.40

(5.43-7.71)7.80

(6.48-9.59)9.28

(7.52-11.7)10.9

(8.56-14.1)13.0

(9.87-17.6)14.8

(10.8-20.6)

30-day1.58

(1.40-1.82)2.53

(2.24-2.92)4.04

(3.57-4.67)5.40

(4.73-6.29)7.46

(6.33-8.98)9.15

(7.60-11.2)10.9

(8.85-13.7)12.8

(10.1-16.5)15.4

(11.6-20.7)17.3

(12.7-24.2)

45-day1.78

(1.58-2.05)2.90

(2.57-3.34)4.68

(4.13-5.41)6.31

(5.53-7.35)8.82

(7.48-10.6)10.9

(9.07-13.4)13.1

(10.6-16.5)15.4

(12.1-19.9)18.5

(14.0-24.9)20.8

(15.2-29.1)

60-day1.93

(1.71-2.22)3.17

(2.81-3.66)5.19

(4.58-5.99)7.04

(6.17-8.20)9.88

(8.37-11.9)12.3

(10.2-15.1)14.8

(12.0-18.6)17.4

(13.7-22.5)20.9

(15.8-28.2)23.5

(17.2-32.8)














Area 5

PF tabular

Back to Top



1 2 5 10 25 50 100 200 500 1000

5-min0.091

(0.075-0.112)0.123

(0.101-0.150)0.168

(0.138-0.206)0.206

(0.168-0.255)0.263

(0.208-0.336)0.309

(0.239-0.404)0.360

(0.271-0.481)0.413

(0.304-0.569)0.490

(0.346-0.703)0.553

(0.377-0.821)

10-min0.131

(0.108-0.160)0.176

(0.145-0.215)0.240

(0.197-0.295)0.295

(0.241-0.366)0.377

(0.297-0.482)0.444

(0.343-0.579)0.515

(0.389-0.690)0.593

(0.435-0.815)0.703

(0.495-1.01)0.793

(0.540-1.18)

15-min0.158

(0.131-0.194)0.213

(0.175-0.261)0.290

(0.239-0.357)0.357

(0.291-0.442)0.456

(0.360-0.583)0.536

(0.415-0.701)0.623

(0.471-0.834)0.717

(0.526-0.986)0.850

(0.599-1.22)0.959

(0.654-1.42)

30-min0.227

(0.188-0.278)0.306

(0.252-0.374)0.417

(0.343-0.513)0.513

(0.418-0.635)0.655

(0.517-0.838)0.771

(0.596-1.01)0.895

(0.676-1.20)1.03

(0.756-1.42)1.22

(0.860-1.75)1.38

(0.939-2.04)

60-min0.306

(0.253-0.375)0.412

(0.339-0.504)0.562

(0.462-0.691)0.691

(0.564-0.856)0.882

(0.696-1.13)1.04

(0.803-1.36)1.21

(0.911-1.62)1.39

(1.02-1.91)1.65

(1.16-2.36)1.86

(1.27-2.75)

2-hr0.410

(0.338-0.501)0.542

(0.447-0.664)0.728

(0.598-0.894)0.887

(0.723-1.10)1.12

(0.882-1.43)1.30

(1.01-1.70)1.50

(1.13-2.01)1.71

(1.25-2.35)1.99

(1.40-2.86)2.22

(1.51-3.28)

3-hr0.486

(0.401-0.595)0.639

(0.527-0.783)0.852

(0.701-1.05)1.04

(0.845-1.28)1.30

(1.03-1.66)1.52

(1.17-1.98)1.74

(1.31-2.33)1.97

(1.45-2.72)2.30

(1.62-3.29)2.54

(1.73-3.77)

6-hr0.633

(0.522-0.774)0.829

(0.684-1.02)1.10

(0.906-1.35)1.34

(1.09-1.65)1.67

(1.32-2.14)1.94

(1.50-2.53)2.22

(1.68-2.97)2.52

(1.85-3.46)2.92

(2.06-4.19)3.23

(2.20-4.80)

12-hr0.763

(0.630-0.934)1.03

(0.852-1.27)1.41

(1.16-1.74)1.73

(1.41-2.15)2.19

(1.73-2.81)2.56

(1.98-3.35)2.95

(2.23-3.95)3.36

(2.47-4.63)3.93

(2.77-5.63)4.37

(2.98-6.48)

24-hr0.938

(0.831-1.08)1.33

(1.17-1.53)1.87

(1.65-2.16)2.33

(2.04-2.71)2.98

(2.53-3.59)3.52

(2.92-4.33)4.09

(3.31-5.15)4.70

(3.70-6.08)5.57

(4.21-7.51)6.27

(4.58-8.74)

2-day1.08

(0.961-1.25)1.56

(1.38-1.79)2.23

(1.97-2.57)2.79

(2.45-3.26)3.61

(3.06-4.34)4.27

(3.54-5.24)4.97

(4.03-6.26)5.74

(4.52-7.42)6.83

(5.17-9.21)7.71

(5.64-10.8)

3-day1.16

(1.03-1.33)1.67

(1.48-1.93)2.42

(2.14-2.80)3.06

(2.68-3.56)3.95

(3.35-4.76)4.69

(3.89-5.76)5.47

(4.43-6.89)6.32

(4.99-8.19)7.56

(5.72-10.2)8.59

(6.28-12.0)

4-day1.21

(1.07-1.39)1.76

(1.56-2.03)2.57

(2.27-2.97)3.26

(2.85-3.79)4.24

(3.59-5.10)5.03

(4.17-6.18)5.88

(4.77-7.41)6.81

(5.37-8.82)8.17

(6.18-11.0)9.28

(6.79-12.9)

7-day1.28

(1.14-1.48)1.91

(1.69-2.20)2.84

(2.51-3.29)3.65

(3.20-4.25)4.81

(4.08-5.79)5.76

(4.78-7.07)6.75

(5.47-8.50)7.82

(6.17-10.1)9.37

(7.09-12.6)10.6

(7.76-14.8)

10-day1.33

(1.18-1.53)2.01

(1.78-2.32)3.04

(2.68-3.51)3.93

(3.44-4.58)5.24

(4.44-6.31)6.30

(5.23-7.74)7.41

(6.01-9.33)8.61

(6.79-11.1)10.3

(7.83-13.9)11.7

(8.57-16.4)

20-day1.43

(1.27-1.65)2.27

(2.01-2.62)3.56

(3.14-4.12)4.70

(4.12-5.47)6.41

(5.43-7.72)7.81

(6.49-9.60)9.30

(7.54-11.7)10.9

(8.58-14.1)13.1

(9.89-17.6)14.8

(10.8-20.6)

30-day1.58

(1.40-1.82)2.53

(2.24-2.92)4.04

(3.57-4.67)5.40

(4.73-6.30)7.47

(6.33-9.00)9.16

(7.61-11.3)10.9

(8.86-13.8)12.8

(10.1-16.6)15.4

(11.6-20.8)17.4

(12.7-24.2)

45-day1.78

(1.58-2.05)2.90

(2.57-3.35)4.68

(4.13-5.41)6.31

(5.53-7.36)8.83

(7.49-10.6)10.9

(9.08-13.4)13.1

(10.6-16.5)15.4

(12.1-19.9)18.5

(14.0-25.0)20.9

(15.3-29.1)

60-day1.93

(1.71-2.23)3.18

(2.81-3.66)5.19

(4.58-6.00)7.05

(6.17-8.21)9.89

(8.38-11.9)12.3

(10.2-15.1)14.8

(12.0-18.7)17.4

(13.7-22.5)20.9

(15.8-28.2)23.5

(17.2-32.8)














Area 6

PF tabular

Back to Top



1 2 5 10 25 50 100 200 500 1000

5-min0.091

(0.075-0.112)0.123

(0.101-0.150)0.168

(0.138-0.206)0.206

(0.168-0.255)0.263

(0.208-0.336)0.309

(0.239-0.404)0.360

(0.271-0.481)0.413

(0.304-0.569)0.490

(0.346-0.703)0.553

(0.377-0.821)

10-min0.131

(0.108-0.160)0.176

(0.145-0.215)0.240

(0.197-0.295)0.295

(0.241-0.366)0.377

(0.297-0.482)0.444

(0.343-0.579)0.515

(0.389-0.690)0.593

(0.435-0.815)0.703

(0.495-1.01)0.793

(0.540-1.18)

15-min0.158

(0.131-0.194)0.213

(0.175-0.261)0.290

(0.239-0.357)0.357

(0.291-0.442)0.456

(0.360-0.583)0.536

(0.415-0.701)0.623

(0.471-0.834)0.717

(0.526-0.986)0.850

(0.599-1.22)0.959

(0.654-1.42)

30-min0.227

(0.188-0.278)0.306

(0.252-0.374)0.417

(0.343-0.513)0.513

(0.418-0.635)0.655

(0.517-0.838)0.771

(0.596-1.01)0.895

(0.676-1.20)1.03

(0.756-1.42)1.22

(0.860-1.75)1.38

(0.939-2.04)

60-min0.306

(0.253-0.375)0.412

(0.339-0.504)0.562

(0.462-0.691)0.691

(0.564-0.856)0.882

(0.696-1.13)1.04

(0.803-1.36)1.21

(0.911-1.62)1.39

(1.02-1.91)1.65

(1.16-2.36)1.86

(1.27-2.75)

2-hr0.410

(0.338-0.501)0.542

(0.447-0.664)0.728

(0.598-0.894)0.887

(0.723-1.10)1.12

(0.882-1.43)1.30

(1.01-1.70)1.50

(1.13-2.01)1.71

(1.25-2.35)1.99

(1.40-2.86)2.22

(1.51-3.28)

3-hr0.486

(0.401-0.595)0.639

(0.527-0.783)0.852

(0.701-1.05)1.04

(0.845-1.28)1.30

(1.03-1.66)1.52

(1.17-1.98)1.74

(1.31-2.33)1.97

(1.45-2.72)2.30

(1.62-3.29)2.54

(1.73-3.77)

6-hr0.633

(0.522-0.774)0.829

(0.684-1.02)1.10

(0.906-1.35)1.34

(1.09-1.65)1.67

(1.32-2.14)1.94

(1.50-2.53)2.22

(1.68-2.97)2.52

(1.85-3.46)2.92

(2.06-4.19)3.23

(2.20-4.80)

12-hr0.763

(0.630-0.934)1.03

(0.852-1.27)1.41

(1.16-1.74)1.73

(1.41-2.15)2.19

(1.73-2.81)2.56

(1.98-3.35)2.95

(2.23-3.95)3.36

(2.47-4.63)3.93

(2.77-5.63)4.37

(2.98-6.48)

24-hr0.938

(0.831-1.08)1.33

(1.17-1.53)1.87

(1.65-2.16)2.33

(2.04-2.71)2.98

(2.53-3.59)3.52

(2.92-4.33)4.09

(3.31-5.15)4.70

(3.70-6.08)5.57

(4.21-7.51)6.27

(4.58-8.74)

2-day1.08

(0.961-1.25)1.56

(1.38-1.79)2.23

(1.97-2.57)2.79

(2.45-3.26)3.61

(3.06-4.34)4.27

(3.54-5.24)4.97

(4.03-6.26)5.74

(4.52-7.42)6.83

(5.17-9.21)7.71

(5.64-10.8)

3-day1.16

(1.03-1.33)1.67

(1.48-1.93)2.42

(2.14-2.80)3.06

(2.68-3.56)3.95

(3.35-4.76)4.69

(3.89-5.76)5.47

(4.43-6.89)6.32

(4.99-8.19)7.56

(5.72-10.2)8.59

(6.28-12.0)

4-day1.21

(1.07-1.39)1.76

(1.56-2.03)2.57

(2.27-2.97)3.26

(2.85-3.79)4.24

(3.59-5.10)5.03

(4.17-6.18)5.88

(4.77-7.41)6.81

(5.37-8.82)8.17

(6.18-11.0)9.28

(6.79-12.9)

7-day1.28

(1.14-1.48)1.91

(1.69-2.20)2.84

(2.51-3.29)3.65

(3.20-4.25)4.81

(4.08-5.79)5.76

(4.78-7.07)6.75

(5.47-8.50)7.82

(6.17-10.1)9.37

(7.09-12.6)10.6

(7.76-14.8)

10-day1.33

(1.18-1.53)2.01

(1.78-2.32)3.04

(2.68-3.51)3.93

(3.44-4.58)5.24

(4.44-6.31)6.30

(5.23-7.74)7.41

(6.01-9.33)8.61

(6.79-11.1)10.3

(7.83-13.9)11.7

(8.57-16.4)

20-day1.43

(1.27-1.65)2.27

(2.01-2.62)3.56

(3.14-4.12)4.70

(4.12-5.47)6.41

(5.43-7.72)7.81

(6.49-9.60)9.30

(7.54-11.7)10.9

(8.58-14.1)13.1

(9.89-17.6)14.8

(10.8-20.6)

30-day1.58

(1.40-1.82)2.53

(2.24-2.92)4.04

(3.57-4.67)5.40

(4.73-6.30)7.47

(6.33-9.00)9.16

(7.61-11.3)10.9

(8.86-13.8)12.8

(10.1-16.6)15.4

(11.6-20.8)17.4

(12.7-24.2)

45-day1.78

(1.58-2.05)2.90

(2.57-3.35)4.68

(4.13-5.41)6.31

(5.53-7.36)8.83

(7.49-10.6)10.9

(9.08-13.4)13.1

(10.6-16.5)15.4

(12.1-19.9)18.5

(14.0-25.0)20.9

(15.3-29.1)

60-day1.93

(1.71-2.23)3.18

(2.81-3.66)5.19

(4.58-6.00)7.05

(6.17-8.21)9.89

(8.38-11.9)12.3

(10.2-15.1)14.8

(12.0-18.7)17.4

(13.7-22.5)20.9

(15.8-28.2)23.5

(17.2-32.8)














Appendix C

Off-Site Unit Hydrograph Calculations

Area 1

1. Enter the design storm return frequency (year) 100

2. Enter flow length (feet) 56909

Flow length (miles) 10.78

3. Enter the centroidal length (feet) 22699

Centroidal length (miles) 4.30

4. Enter upstream elevation 8195

Enter downstream elevation 3355

Difference in elevation 4840

5. Enter the watershed area (acres) 10541.6

6. Enter the S-Graph proportions (decimal)

Valley DevelopedValley UndevelopedFoothillMountain 0.78Desert 0.22

7. Basin Factor, n= 0.04

8. Enter the pervious fraction 1.0

9. Enter the area averaged Curve Number 92.6

10. Enter area-averaged point rainfall (inches)

5-Minute 0.4630-Minute 1.18

1-Hour 1.683-Hour 2.656-Hour 3.67

24-Hour 7.7

UNIT HYDROGRAPH METHOD SUMMARYAGINCOURT AREA 1

SAN BERNARDINO COUNTY

(1) (2) (3)Cover SOIL CURVE Area Weighting PERCENTAGEType GROUP NUMBER (acres) (1)*(2) BREAKDOWN

AREA 1 Chaparral, Broadleaf (Fair) AMC 1 A 23.0 258.7 5950.1 2.5%Chaparral, Broadleaf (Fair) AMC 2 A 40.0 431.4 17256.0 4.1%Chaparral, Broadleaf (Fair) AMC 3 A 73.0 225.1 16432.3 2.1%

Barren AMC 3 A 92.8 178.9 16601.9 1.7%Chaparral, Broadleaf (Fair) AMC 3 B 81.4 53.5 4354.9 0.5%

Barren AMC 3 B 97.2 1507.9 146567.9 14.3%Chaparral, Broadleaf (Fair) AMC 3 C 91.0 511.0 46501.0 4.8%

Barren AMC 3 C 98.2 557.7 54766.1 5.3%Chaparral, Broadleaf (Fair) AMC 2 D 81.0 48.3 3912.3 0.5%Chaparral, Broadleaf (Fair) AMC 3 D 94.6 801.0 75774.6 7.6%

Barren AMC 3 D 98.6 5968.1 588454.7 56.6%100%

TOTAL MAP AREA= 10541.6TOTAL WEIGHTING= 976571.8

TOTAL AVERAGED VALUE= 92.6

CURVE NUMBER AREA-AVERAGINGAGINCOURT AVERAGE CURVE NUMBER


U n i t H y d r o g r a p h A n a l y s i s

Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2004, Version 7.0

Study date 12/01/11

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------------------------------------------------------

San Bernardino County Synthetic Unit Hydrology MethodManual date - August 1986

Program License Serial Number 6264

---------------------------------------------------------------------WDG SOLAR - AGINCOURTPRE-DEVELOPMENT CONDITION - OFFSITE AREA100-YEAR 24-HOUR STORM EVENT, AREA 1BY: CRC--------------------------------------------------------------------

Storm Event Year = 100

Antecedent Moisture Condition = 2

English (in-lb) Input Units Used

English Rainfall Data (Inches) Input Values Used

English Units used in output format

Area averaged rainfall intensity isohyetal data:Sub-Area Duration Isohyetal(Ac.) (hours) (In)

Rainfall data for year 10010541.60 1 1.68

--------------------------------------------------------------------Rainfall data for year 100

10541.60 6 3.67--------------------------------------------------------------------Rainfall data for year 100

10541.60 24 7.70--------------------------------------------------------------------++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

******** Area-averaged max loss rate, Fm ********

SCS curve SCS curve Area Area Fp(Fig C6) Ap FmNo.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)92.6 92.6 10541.60 1.000 0.144 1.000 0.144

Area-averaged adjusted loss rate Fm (In/Hr) = 0.144

********* Area-Averaged low loss rate fraction, Yb **********

Area Area SCS CN SCS CN S Pervious(Ac.) Fract (AMC2) (AMC2) Yield Fr10541.60 1.000 92.6 92.6 0.80 0.885

Area-averaged catchment yield fraction, Y = 0.885Area-averaged low loss fraction, Yb = 0.115++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++Watercourse length = 56909.00(Ft.)Length from concentration point to centroid = 22699.00(Ft.)

Elevation difference along watercourse = 4840.00(Ft.)Mannings friction factor along watercourse = 0.040Watershed area = 10541.60(Ac.)Catchment Lag time = 1.292 hoursUnit interval = 5.000 minutesUnit interval percentage of lag time = 6.4481Hydrograph baseflow = 0.00(CFS)Average maximum watershed loss rate(Fm) = 0.144(In/Hr)Average low loss rate fraction (Yb) = 0.115 (decimal)VALLEY DEVELOPED S-Graph proportion = 0.000VALLEY UNDEVELOPED S-Graph proportion = 0.000FOOTHILL S-Graph proportion = 0.000MOUNTAIN S-Graph proportion = 0.780DESERT S-Graph proportion = 0.220

Computed peak 5-minute rainfall = 0.460(In)Computed peak 30-minute rainfall = 1.180(In)Specified peak 1-hour rainfall = 1.680(In)Computed peak 3-hour rainfall = 2.650(In)Specified peak 6-hour rainfall = 3.670(In)Specified peak 24-hour rainfall = 7.700(In)

Note: user specified rainfall values used.Rainfall depth area reduction factors:Using a total area of 10541.60(Ac.) (Ref: fig. E-4)

5-minute factor = 0.664 Adjusted rainfall = 0.305(In)30-minute factor = 0.677 Adjusted rainfall = 0.799(In)1-hour factor = 0.680 Adjusted rainfall = 1.143(In)3-hour factor = 0.942 Adjusted rainfall = 2.496(In)6-hour factor = 0.972 Adjusted rainfall = 3.566(In)24-hour factor = 0.984 Adjusted rainfall = 7.576(In)---------------------------------------------------------------------

U n i t H y d r o g r a p h +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++Interval 'S' Graph Unit HydrographNumber Mean values ((CFS))---------------------------------------------------------------------

(K = 127487.48 (CFS))

1 0.616 784.900 2 1.847 1570.074 3 3.279 1825.401 4 5.198 2446.494 5 7.371 2770.247 6 9.826 3130.292 7 13.319 4452.628 8 17.616 5478.673 9 22.368 6057.80210 27.325 6319.88411 32.309 6354.06212 36.861 5803.18813 40.634 4809.59014 44.167 4503.68015 47.208 3877.46616 49.902 3433.93517 52.128 2838.41018 54.242 2695.55219 56.116 2389.04020 57.858 2220.42221 59.364 1919.72722 60.829 1867.80323 62.221 1775.24224 63.538 1678.30825 64.691 1470.30726 65.818 1436.88627 66.908 1389.09528 67.939 1314.60529 68.874 1192.262

30 69.803 1184.19131 70.725 1175.91532 71.584 1094.79533 72.375 1008.19534 73.166 1008.17135 73.956 1007.34736 74.678 920.48737 75.354 862.17438 76.031 862.17439 76.704 858.91140 77.312 774.80841 77.891 737.87942 78.470 737.87943 79.044 732.90644 79.574 674.48845 80.089 657.64646 80.605 657.64647 81.111 644.88648 81.550 560.12149 81.978 544.53150 82.405 544.53151 82.824 534.06952 83.209 490.73253 83.590 486.00054 83.971 486.00055 84.339 468.91656 84.670 422.79957 85.000 420.23658 85.330 420.23659 85.657 417.66160 85.981 413.09061 86.305 413.00262 86.629 413.00263 86.923 374.59664 87.183 330.84265 87.442 330.79666 87.701 330.79667 87.961 330.79668 88.220 330.79669 88.480 330.79670 88.739 330.18071 88.984 311.96772 89.222 303.50473 89.460 303.50474 89.698 303.50475 89.936 303.50476 90.174 303.50477 90.412 303.50478 90.645 296.59779 90.839 247.38880 91.025 237.73981 91.212 237.73982 91.398 237.73983 91.585 237.73984 91.771 237.73985 91.958 237.73986 92.139 230.97387 92.305 211.64188 92.470 210.44789 92.635 210.44790 92.800 210.44791 92.965 210.44792 93.130 210.44793 93.295 210.44794 93.452 200.50695 93.600 188.44396 93.748 188.41697 93.896 188.41698 94.044 188.41699 94.191 188.416100 94.339 188.416

101 94.487 188.170102 94.628 179.739103 94.766 175.591104 94.903 175.591105 95.041 175.591106 95.179 175.591107 95.316 175.591108 95.454 175.591109 95.589 172.076110 95.703 145.164111 95.813 139.544112 95.922 139.544113 96.031 139.544114 96.141 139.544115 96.250 139.544116 96.360 139.544117 96.467 136.514118 96.567 127.347119 96.666 126.720120 96.766 126.720121 96.869 131.977122 96.960 115.417123 97.050 115.417124 97.141 115.417125 97.231 115.417126 97.322 115.417127 97.412 115.417128 97.503 115.417129 97.593 115.417130 97.684 115.417131 97.774 115.417132 97.865 115.417133 97.955 115.417134 98.046 115.417135 98.137 115.417136 98.227 115.417137 98.318 115.417138 98.408 115.417139 98.499 115.417140 98.589 115.417141 98.680 115.417142 98.770 115.417143 98.861 115.417144 98.951 115.417145 99.042 115.417146 99.132 115.417147 99.223 115.417148 99.313 115.417149 99.404 115.417150 99.495 115.417151 99.585 115.417152 99.676 115.417153 99.766 115.417154 99.857 115.417155 99.947 115.417156 100.000 67.335---------------------------------------------------------------------Peak Unit Adjusted mass rainfall Unit rainfallNumber (In) (In) 1 0.3055 0.3055 2 0.4431 0.1376 3 0.5508 0.1077 4 0.6427 0.0919 5 0.7245 0.0817 6 0.7989 0.0745 7 0.8651 0.0662 8 0.9269 0.0618 9 0.9851 0.058110 1.0402 0.055111 1.0927 0.052512 1.1429 0.0502

13 1.2098 0.066914 1.2753 0.065515 1.3394 0.064116 1.4023 0.062917 1.4641 0.061818 1.5248 0.060719 1.5846 0.059820 1.6435 0.058921 1.7015 0.058022 1.7587 0.057223 1.8152 0.056524 1.8710 0.055825 1.9261 0.055126 1.9806 0.054527 2.0345 0.053928 2.0878 0.053329 2.1405 0.052830 2.1927 0.052231 2.2445 0.051732 2.2957 0.051333 2.3465 0.050834 2.3969 0.050335 2.4468 0.049936 2.4963 0.049537 2.5317 0.035438 2.5667 0.035039 2.6012 0.034540 2.6353 0.034141 2.6690 0.033742 2.7023 0.033343 2.7353 0.032944 2.7678 0.032545 2.8000 0.032246 2.8318 0.031847 2.8633 0.031548 2.8945 0.031249 2.9254 0.030950 2.9560 0.030651 2.9862 0.030352 3.0162 0.030053 3.0459 0.029754 3.0753 0.029455 3.1045 0.029256 3.1334 0.028957 3.1621 0.028758 3.1905 0.028459 3.2187 0.028260 3.2467 0.028061 3.2744 0.027762 3.3019 0.027563 3.3292 0.027364 3.3563 0.027165 3.3831 0.026966 3.4098 0.026767 3.4363 0.026568 3.4626 0.026369 3.4887 0.026170 3.5146 0.025971 3.5404 0.025772 3.5659 0.025673 3.5928 0.026874 3.6194 0.026775 3.6460 0.026576 3.6723 0.026377 3.6985 0.026278 3.7245 0.026079 3.7504 0.025980 3.7761 0.025781 3.8017 0.025682 3.8272 0.025483 3.8524 0.0253

84 3.8776 0.025285 3.9026 0.025086 3.9275 0.024987 3.9523 0.024888 3.9769 0.024689 4.0014 0.024590 4.0258 0.024491 4.0500 0.024392 4.0742 0.024193 4.0982 0.024094 4.1221 0.023995 4.1459 0.023896 4.1695 0.023797 4.1931 0.023698 4.2165 0.023499 4.2399 0.0233100 4.2631 0.0232101 4.2862 0.0231102 4.3092 0.0230103 4.3321 0.0229104 4.3549 0.0228105 4.3777 0.0227106 4.4003 0.0226107 4.4228 0.0225108 4.4452 0.0224109 4.4675 0.0223110 4.4898 0.0222111 4.5119 0.0221112 4.5339 0.0220113 4.5559 0.0220114 4.5778 0.0219115 4.5996 0.0218116 4.6213 0.0217117 4.6429 0.0216118 4.6644 0.0215119 4.6858 0.0214120 4.7072 0.0214121 4.7285 0.0213122 4.7497 0.0212123 4.7708 0.0211124 4.7919 0.0210125 4.8128 0.0210126 4.8337 0.0209127 4.8545 0.0208128 4.8753 0.0207129 4.8959 0.0207130 4.9165 0.0206131 4.9371 0.0205132 4.9575 0.0205133 4.9779 0.0204134 4.9982 0.0203135 5.0184 0.0202136 5.0386 0.0202137 5.0587 0.0201138 5.0788 0.0200139 5.0987 0.0200140 5.1186 0.0199141 5.1385 0.0198142 5.1582 0.0198143 5.1780 0.0197144 5.1976 0.0197145 5.2172 0.0196146 5.2367 0.0195147 5.2562 0.0195148 5.2756 0.0194149 5.2949 0.0193150 5.3142 0.0193151 5.3335 0.0192152 5.3526 0.0192153 5.3717 0.0191154 5.3908 0.0191

155 5.4098 0.0190156 5.4287 0.0189157 5.4476 0.0189158 5.4665 0.0188159 5.4852 0.0188160 5.5040 0.0187161 5.5226 0.0187162 5.5413 0.0186163 5.5598 0.0186164 5.5783 0.0185165 5.5968 0.0185166 5.6152 0.0184167 5.6336 0.0184168 5.6519 0.0183169 5.6702 0.0183170 5.6884 0.0182171 5.7065 0.0182172 5.7246 0.0181173 5.7427 0.0181174 5.7607 0.0180175 5.7787 0.0180176 5.7966 0.0179177 5.8145 0.0179178 5.8323 0.0178179 5.8501 0.0178180 5.8679 0.0177181 5.8856 0.0177182 5.9032 0.0177183 5.9208 0.0176184 5.9384 0.0176185 5.9559 0.0175186 5.9734 0.0175187 5.9908 0.0174188 6.0082 0.0174189 6.0256 0.0174190 6.0429 0.0173191 6.0602 0.0173192 6.0774 0.0172193 6.0946 0.0172194 6.1117 0.0171195 6.1288 0.0171196 6.1459 0.0171197 6.1629 0.0170198 6.1799 0.0170199 6.1968 0.0169200 6.2137 0.0169201 6.2306 0.0169202 6.2474 0.0168203 6.2642 0.0168204 6.2810 0.0168205 6.2977 0.0167206 6.3144 0.0167207 6.3310 0.0166208 6.3476 0.0166209 6.3642 0.0166210 6.3807 0.0165211 6.3972 0.0165212 6.4137 0.0165213 6.4301 0.0164214 6.4465 0.0164215 6.4629 0.0164216 6.4792 0.0163217 6.4955 0.0163218 6.5117 0.0163219 6.5280 0.0162220 6.5441 0.0162221 6.5603 0.0162222 6.5764 0.0161223 6.5925 0.0161224 6.6086 0.0161225 6.6246 0.0160

226 6.6406 0.0160227 6.6565 0.0160228 6.6724 0.0159229 6.6883 0.0159230 6.7042 0.0159231 6.7200 0.0158232 6.7358 0.0158233 6.7516 0.0158234 6.7673 0.0157235 6.7830 0.0157236 6.7987 0.0157237 6.8143 0.0156238 6.8300 0.0156239 6.8455 0.0156240 6.8611 0.0156241 6.8766 0.0155242 6.8921 0.0155243 6.9076 0.0155244 6.9230 0.0154245 6.9384 0.0154246 6.9538 0.0154247 6.9692 0.0154248 6.9845 0.0153249 6.9998 0.0153250 7.0150 0.0153251 7.0303 0.0152252 7.0455 0.0152253 7.0607 0.0152254 7.0758 0.0152255 7.0910 0.0151256 7.1061 0.0151257 7.1211 0.0151258 7.1362 0.0150259 7.1512 0.0150260 7.1662 0.0150261 7.1812 0.0150262 7.1961 0.0149263 7.2110 0.0149264 7.2259 0.0149265 7.2408 0.0149266 7.2556 0.0148267 7.2704 0.0148268 7.2852 0.0148269 7.3000 0.0148270 7.3147 0.0147271 7.3294 0.0147272 7.3441 0.0147273 7.3588 0.0147274 7.3734 0.0146275 7.3880 0.0146276 7.4026 0.0146277 7.4172 0.0146278 7.4317 0.0145279 7.4463 0.0145280 7.4608 0.0145281 7.4752 0.0145282 7.4897 0.0144283 7.5041 0.0144284 7.5185 0.0144285 7.5329 0.0144286 7.5472 0.0144287 7.5616 0.0143288 7.5759 0.0143---------------------------------------------------------------------Unit Unit Unit EffectivePeriod Rainfall Soil-Loss Rainfall(number) (In) (In) (In)--------------------------------------------------------------------- 1 0.0143 0.0016 0.0127 2 0.0143 0.0016 0.0127 3 0.0144 0.0016 0.0127

4 0.0144 0.0017 0.0128 5 0.0144 0.0017 0.0128 6 0.0145 0.0017 0.0128 7 0.0145 0.0017 0.0129 8 0.0145 0.0017 0.0129 9 0.0146 0.0017 0.012910 0.0146 0.0017 0.012911 0.0147 0.0017 0.013012 0.0147 0.0017 0.013013 0.0147 0.0017 0.013014 0.0148 0.0017 0.013115 0.0148 0.0017 0.013116 0.0148 0.0017 0.013117 0.0149 0.0017 0.013218 0.0149 0.0017 0.013219 0.0150 0.0017 0.013320 0.0150 0.0017 0.013321 0.0150 0.0017 0.013322 0.0151 0.0017 0.013323 0.0151 0.0017 0.013424 0.0152 0.0017 0.013425 0.0152 0.0017 0.013526 0.0152 0.0017 0.013527 0.0153 0.0018 0.013528 0.0153 0.0018 0.013629 0.0154 0.0018 0.013630 0.0154 0.0018 0.013631 0.0155 0.0018 0.013732 0.0155 0.0018 0.013733 0.0156 0.0018 0.013834 0.0156 0.0018 0.013835 0.0156 0.0018 0.013936 0.0157 0.0018 0.013937 0.0157 0.0018 0.013938 0.0158 0.0018 0.014039 0.0158 0.0018 0.014040 0.0159 0.0018 0.014041 0.0159 0.0018 0.014142 0.0160 0.0018 0.014143 0.0160 0.0018 0.014244 0.0161 0.0018 0.014245 0.0161 0.0018 0.014346 0.0162 0.0019 0.014347 0.0162 0.0019 0.014448 0.0163 0.0019 0.014449 0.0163 0.0019 0.014550 0.0164 0.0019 0.014551 0.0164 0.0019 0.014552 0.0165 0.0019 0.014653 0.0165 0.0019 0.014654 0.0166 0.0019 0.014755 0.0166 0.0019 0.014756 0.0167 0.0019 0.014857 0.0168 0.0019 0.014858 0.0168 0.0019 0.014959 0.0169 0.0019 0.014960 0.0169 0.0019 0.015061 0.0170 0.0019 0.015062 0.0170 0.0020 0.015163 0.0171 0.0020 0.015164 0.0171 0.0020 0.015265 0.0172 0.0020 0.015366 0.0173 0.0020 0.015367 0.0174 0.0020 0.015468 0.0174 0.0020 0.015469 0.0175 0.0020 0.015570 0.0175 0.0020 0.015571 0.0176 0.0020 0.015672 0.0177 0.0020 0.015673 0.0177 0.0020 0.015774 0.0178 0.0020 0.0157

75 0.0179 0.0020 0.015876 0.0179 0.0021 0.015977 0.0180 0.0021 0.016078 0.0181 0.0021 0.016079 0.0182 0.0021 0.016180 0.0182 0.0021 0.016181 0.0183 0.0021 0.016282 0.0184 0.0021 0.016383 0.0185 0.0021 0.016384 0.0185 0.0021 0.016485 0.0186 0.0021 0.016586 0.0187 0.0021 0.016587 0.0188 0.0022 0.016688 0.0188 0.0022 0.016789 0.0189 0.0022 0.016890 0.0190 0.0022 0.016891 0.0191 0.0022 0.016992 0.0192 0.0022 0.017093 0.0193 0.0022 0.017194 0.0193 0.0022 0.017195 0.0195 0.0022 0.017296 0.0195 0.0022 0.017397 0.0197 0.0023 0.017498 0.0197 0.0023 0.017599 0.0198 0.0023 0.0176100 0.0199 0.0023 0.0176101 0.0200 0.0023 0.0177102 0.0201 0.0023 0.0178103 0.0202 0.0023 0.0179104 0.0203 0.0023 0.0180105 0.0205 0.0023 0.0181106 0.0205 0.0024 0.0182107 0.0207 0.0024 0.0183108 0.0207 0.0024 0.0184109 0.0209 0.0024 0.0185110 0.0210 0.0024 0.0186111 0.0211 0.0024 0.0187112 0.0212 0.0024 0.0188113 0.0214 0.0024 0.0189114 0.0214 0.0025 0.0190115 0.0216 0.0025 0.0191116 0.0217 0.0025 0.0192117 0.0219 0.0025 0.0194118 0.0220 0.0025 0.0194119 0.0221 0.0025 0.0196120 0.0222 0.0025 0.0197121 0.0224 0.0026 0.0199122 0.0225 0.0026 0.0199123 0.0227 0.0026 0.0201124 0.0228 0.0026 0.0202125 0.0230 0.0026 0.0204126 0.0231 0.0026 0.0205127 0.0233 0.0027 0.0207128 0.0234 0.0027 0.0208129 0.0237 0.0027 0.0210130 0.0238 0.0027 0.0211131 0.0240 0.0028 0.0213132 0.0241 0.0028 0.0214133 0.0244 0.0028 0.0216134 0.0245 0.0028 0.0217135 0.0248 0.0028 0.0219136 0.0249 0.0029 0.0220137 0.0252 0.0029 0.0223138 0.0253 0.0029 0.0224139 0.0256 0.0029 0.0227140 0.0257 0.0029 0.0228141 0.0260 0.0030 0.0230142 0.0262 0.0030 0.0232143 0.0265 0.0030 0.0235144 0.0267 0.0031 0.0236145 0.0256 0.0029 0.0226

146 0.0257 0.0030 0.0228147 0.0261 0.0030 0.0231148 0.0263 0.0030 0.0233149 0.0267 0.0031 0.0236150 0.0269 0.0031 0.0238151 0.0273 0.0031 0.0242152 0.0275 0.0032 0.0244153 0.0280 0.0032 0.0248154 0.0282 0.0032 0.0250155 0.0287 0.0033 0.0254156 0.0289 0.0033 0.0256157 0.0294 0.0034 0.0261158 0.0297 0.0034 0.0263159 0.0303 0.0035 0.0268160 0.0306 0.0035 0.0271161 0.0312 0.0036 0.0276162 0.0315 0.0036 0.0279163 0.0322 0.0037 0.0285164 0.0325 0.0037 0.0288165 0.0333 0.0038 0.0295166 0.0337 0.0039 0.0298167 0.0345 0.0040 0.0306168 0.0350 0.0040 0.0310169 0.0495 0.0057 0.0438170 0.0499 0.0057 0.0442171 0.0508 0.0058 0.0450172 0.0513 0.0059 0.0454173 0.0522 0.0060 0.0462174 0.0528 0.0060 0.0467175 0.0539 0.0062 0.0477176 0.0545 0.0062 0.0482177 0.0558 0.0064 0.0494178 0.0565 0.0065 0.0500179 0.0580 0.0066 0.0514180 0.0589 0.0067 0.0521181 0.0607 0.0070 0.0538182 0.0618 0.0071 0.0547183 0.0641 0.0073 0.0568184 0.0655 0.0075 0.0580185 0.0502 0.0058 0.0445186 0.0525 0.0060 0.0465187 0.0581 0.0067 0.0515188 0.0618 0.0071 0.0547189 0.0745 0.0085 0.0659190 0.0817 0.0094 0.0724191 0.1077 0.0120 0.0957192 0.1376 0.0120 0.1256193 0.3055 0.0120 0.2935194 0.0919 0.0105 0.0814195 0.0662 0.0076 0.0586196 0.0551 0.0063 0.0488197 0.0669 0.0077 0.0593198 0.0629 0.0072 0.0557199 0.0598 0.0068 0.0529200 0.0572 0.0066 0.0507201 0.0551 0.0063 0.0488202 0.0533 0.0061 0.0472203 0.0517 0.0059 0.0458204 0.0503 0.0058 0.0446205 0.0354 0.0041 0.0314206 0.0341 0.0039 0.0302207 0.0329 0.0038 0.0291208 0.0318 0.0036 0.0282209 0.0309 0.0035 0.0273210 0.0300 0.0034 0.0265211 0.0292 0.0033 0.0258212 0.0284 0.0033 0.0252213 0.0277 0.0032 0.0246214 0.0271 0.0031 0.0240215 0.0265 0.0030 0.0234216 0.0259 0.0030 0.0230

217 0.0268 0.0031 0.0238218 0.0263 0.0030 0.0233219 0.0259 0.0030 0.0229220 0.0254 0.0029 0.0225221 0.0250 0.0029 0.0222222 0.0246 0.0028 0.0218223 0.0243 0.0028 0.0215224 0.0239 0.0027 0.0212225 0.0236 0.0027 0.0209226 0.0232 0.0027 0.0206227 0.0229 0.0026 0.0203228 0.0226 0.0026 0.0200229 0.0223 0.0026 0.0198230 0.0220 0.0025 0.0195231 0.0218 0.0025 0.0193232 0.0215 0.0025 0.0191233 0.0213 0.0024 0.0188234 0.0210 0.0024 0.0186235 0.0208 0.0024 0.0184236 0.0206 0.0024 0.0182237 0.0204 0.0023 0.0180238 0.0202 0.0023 0.0179239 0.0200 0.0023 0.0177240 0.0198 0.0023 0.0175241 0.0196 0.0022 0.0173242 0.0194 0.0022 0.0172243 0.0192 0.0022 0.0170244 0.0191 0.0022 0.0169245 0.0189 0.0022 0.0167246 0.0187 0.0021 0.0166247 0.0186 0.0021 0.0164248 0.0184 0.0021 0.0163249 0.0183 0.0021 0.0162250 0.0181 0.0021 0.0160251 0.0180 0.0021 0.0159252 0.0178 0.0020 0.0158253 0.0177 0.0020 0.0157254 0.0176 0.0020 0.0156255 0.0174 0.0020 0.0154256 0.0173 0.0020 0.0153257 0.0172 0.0020 0.0152258 0.0171 0.0020 0.0151259 0.0169 0.0019 0.0150260 0.0168 0.0019 0.0149261 0.0167 0.0019 0.0148262 0.0166 0.0019 0.0147263 0.0165 0.0019 0.0146264 0.0164 0.0019 0.0145265 0.0163 0.0019 0.0144266 0.0162 0.0019 0.0143267 0.0161 0.0018 0.0142268 0.0160 0.0018 0.0142269 0.0159 0.0018 0.0141270 0.0158 0.0018 0.0140271 0.0157 0.0018 0.0139272 0.0156 0.0018 0.0138273 0.0155 0.0018 0.0137274 0.0154 0.0018 0.0137275 0.0154 0.0018 0.0136276 0.0153 0.0017 0.0135277 0.0152 0.0017 0.0134278 0.0151 0.0017 0.0134279 0.0150 0.0017 0.0133280 0.0149 0.0017 0.0132281 0.0149 0.0017 0.0132282 0.0148 0.0017 0.0131283 0.0147 0.0017 0.0130284 0.0146 0.0017 0.0130285 0.0146 0.0017 0.0129286 0.0145 0.0017 0.0128287 0.0144 0.0017 0.0128

288 0.0144 0.0016 0.0127----------------------------------------------------------------------------------------------------------------------------------------Total soil rain loss = 0.84(In)Total effective rainfall = 6.73(In)Peak flow rate in flood hydrograph = 8196.68(CFS)---------------------------------------------------------------------++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R S T O R M R u n o f f H y d r o g r a p h-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))

-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 2050.0 4100.0 6150.0 8200.0 ----------------------------------------------------------------------- 0+ 5 0.0685 9.94 Q | | | | 0+10 0.2741 29.85 Q | | | | 0+15 0.6394 53.05 Q | | | | 0+20 1.2190 84.16 Q | | | | 0+25 2.0417 119.45 Q | | | | 0+30 3.1393 159.38 Q | | | | 0+35 4.6281 216.16 VQ | | | | 0+40 6.5983 286.07 VQ | | | | 0+45 9.1016 363.49 VQ | | | | 0+50 12.1623 444.41 V Q | | | | 0+55 15.7847 525.97 V Q | | | | 1+ 0 19.9220 600.74 V Q | | | | 1+ 5 24.4889 663.12 V Q | | | | 1+10 29.4598 721.78 V Q | | | | 1+15 34.7811 772.65 V Q | | | | 1+20 40.4151 818.05 V Q | | | | 1+25 46.3105 856.01 V Q | | | | 1+30 52.4556 892.28 V Q | | | | 1+35 58.8244 924.75 V Q | | | | 1+40 65.4029 955.19 V Q | | | | 1+45 72.1652 981.89 V Q | | | | 1+50 79.1075 1008.03 V Q | | | | 1+55 86.2223 1033.06 V Q | | | | 2+ 0 93.5015 1056.94 V Q | | | | 2+ 5 100.9275 1078.25 V Q | | | | 2+10 108.4979 1099.22 V Q | | | | 2+15 116.2089 1119.64 V Q | | | | 2+20 124.0545 1139.19 V Q | | | | 2+25 132.0245 1157.24 V Q | | | | 2+30 140.1187 1175.27 V Q | | | | 2+35 148.3365 1193.24 |V Q | | | | 2+40 156.6716 1210.25 |V Q | | | | 2+45 165.1166 1226.21 |V Q | | | | 2+50 173.6720 1242.25 |V Q | | | | 2+55 182.3381 1258.32 |V Q | | | | 3+ 0 191.1078 1273.36 |V Q | | | | 3+ 5 199.9764 1287.71 |V Q | | | | 3+10 208.9442 1302.13 |V Q | | | | 3+15 218.0113 1316.54 |V Q | | | | 3+20 227.1708 1329.97 |V Q | | | | 3+25 236.4199 1342.96 |V Q | | | | 3+30 245.7589 1356.03 |V Q | | | | 3+35 255.1878 1369.08 |V Q | | | | 3+40 264.7019 1381.45 |V Q | | | | 3+45 274.3001 1393.65 |V Q | | | | 3+50 283.9828 1405.92 |V Q | | | | 3+55 293.7491 1418.07 |V Q | | | | 4+ 0 303.5922 1429.22 | V Q | | | | 4+ 5 313.5111 1440.21 | V Q | | | | 4+10 323.5060 1451.27 | V Q | | | | 4+15 333.5765 1462.24 | V Q | | | | 4+20 343.7193 1472.73 | V Q | | | | 4+25 353.9341 1483.20 | V Q | | | | 4+30 364.2216 1493.73 | V Q | | | | 4+35 374.5804 1504.10 | V Q | | | |

4+40 385.0070 1513.95 | V Q | | | | 4+45 395.5016 1523.81 | V Q | | | | 4+50 406.0646 1533.74 | V Q | | | | 4+55 416.6960 1543.69 | V Q | | | | 5+ 0 427.3961 1553.64 | V Q | | | | 5+ 5 438.1650 1563.65 | V Q | | | | 5+10 449.0033 1573.72 | V Q | | | | 5+15 459.9079 1583.36 | V Q | | | | 5+20 470.8757 1592.51 | V Q | | | | 5+25 481.9068 1601.72 | V Q | | | | 5+30 493.0018 1610.99 | V Q | | | | 5+35 504.1610 1620.32 | V Q | | | | 5+40 515.3849 1629.72 | V Q | | | | 5+45 526.6740 1639.17 | V Q | | | | 5+50 538.0287 1648.70 | V Q | | | | 5+55 549.4477 1658.04 | V Q | | | | 6+ 0 560.9310 1667.36 | V Q | | | | 6+ 5 572.4787 1676.74 | V Q | | | | 6+10 584.0916 1686.19 | V Q | | | | 6+15 595.7701 1695.71 | V Q | | | | 6+20 607.5146 1705.30 | V Q | | | | 6+25 619.3256 1714.96 | V Q | | | | 6+30 631.2031 1724.62 | V Q | | | | 6+35 643.1433 1733.71 | V Q | | | | 6+40 655.1458 1742.77 | V Q | | | | 6+45 667.2112 1751.89 | V Q | | | | 6+50 679.3400 1761.11 | V Q | | | | 6+55 691.5327 1770.38 | V Q | | | | 7+ 0 703.7900 1779.76 | V Q | | | | 7+ 5 716.1123 1789.19 | V Q | | | | 7+10 728.4996 1798.65 | V Q | | | | 7+15 740.9509 1807.92 | V Q | | | | 7+20 753.4666 1817.28 | V Q | | | | 7+25 766.0473 1826.71 | V Q | | | | 7+30 778.6937 1836.25 | V Q | | | | 7+35 791.4062 1845.86 | V Q| | | | 7+40 804.1857 1855.59 | V Q| | | | 7+45 817.0327 1865.38 | V Q| | | | 7+50 829.9471 1875.17 | V Q| | | | 7+55 842.9284 1884.88 | V Q| | | | 8+ 0 855.9774 1894.72 | V Q| | | | 8+ 5 869.0947 1904.63 | V Q| | | | 8+10 882.2812 1914.67 | V Q| | | | 8+15 895.5373 1924.79 | V Q| | | | 8+20 908.8641 1935.05 | V Q| | | | 8+25 922.2621 1945.39 | V Q| | | | 8+30 935.7315 1955.76 | V Q| | | | 8+35 949.2726 1966.17 | V Q| | | | 8+40 962.8863 1976.72 | V Q| | | | 8+45 976.5734 1987.37 | V Q| | | | 8+50 990.3349 1998.16 | V Q| | | | 8+55 1004.1714 2009.06 | V Q| | | | 9+ 0 1018.0840 2020.12 | V Q| | | | 9+ 5 1032.0733 2031.23 | V Q| | | | 9+10 1046.1378 2042.17 | V Q| | | | 9+15 1060.2780 2053.15 | V Q | | | 9+20 1074.4949 2064.30 | V Q | | | 9+25 1088.7895 2075.57 | V Q | | | 9+30 1103.1628 2087.01 | V Q | | | 9+35 1117.6159 2098.58 | V Q | | | 9+40 1132.1499 2110.34 | V Q | | | 9+45 1146.7655 2122.19 | V Q | | | 9+50 1161.4633 2134.12 | V Q | | | 9+55 1176.2441 2146.18 | V Q | | | 10+ 0 1191.1094 2158.44 | V Q | | | 10+ 5 1206.0607 2170.93 | V Q | | | 10+10 1221.0980 2183.41 | V Q | | | 10+15 1236.2224 2196.06 | V Q | | | 10+20 1251.4354 2208.94 | V Q | | | 10+25 1266.7383 2221.98 | V Q | | | 10+30 1282.1327 2235.26 | V Q | | |

10+35 1297.6198 2248.72 | V Q | | | 10+40 1313.2013 2262.44 | V |Q | | | 10+45 1328.8786 2276.35 | V |Q | | | 10+50 1344.6536 2290.53 | V|Q | | | 10+55 1360.5277 2304.91 | V|Q | | | 11+ 0 1376.5028 2319.58 | V|Q | | | 11+ 5 1392.5804 2334.48 | V|Q | | | 11+10 1408.7627 2349.67 | V|Q | | | 11+15 1425.0513 2365.10 | V|Q | | | 11+20 1441.4484 2380.86 | V|Q | | | 11+25 1457.9558 2396.87 | V|Q | | | 11+30 1474.5758 2413.23 | V|Q | | | 11+35 1491.3104 2429.86 | VQ | | | 11+40 1508.1621 2446.87 | VQ | | | 11+45 1525.1330 2464.17 | V Q | | | 11+50 1542.2258 2481.87 | V Q | | | 11+55 1559.4426 2499.89 | V Q | | | 12+ 0 1576.7866 2518.34 | V Q | | | 12+ 5 1594.2532 2536.14 | V Q | | | 12+10 1611.8386 2553.41 | V Q | | | 12+15 1629.5433 2570.73 | |VQ | | | 12+20 1647.3654 2587.76 | |VQ | | | 12+25 1665.3049 2604.81 | |VQ | | | 12+30 1683.3623 2621.94 | |VQ | | | 12+35 1701.5294 2637.86 | |VQ | | | 12+40 1719.8011 2653.06 | |VQ | | | 12+45 1738.1762 2668.05 | |V Q | | | 12+50 1756.6566 2683.37 | |V Q | | | 12+55 1775.2463 2699.21 | | VQ | | | 13+ 0 1793.9507 2715.88 | | VQ | | | 13+ 5 1812.7771 2733.60 | | VQ | | | 13+10 1831.7338 2752.51 | | VQ | | | 13+15 1850.8311 2772.93 | | VQ | | | 13+20 1870.0790 2794.80 | | VQ | | | 13+25 1889.4883 2818.22 | | VQ | | | 13+30 1909.0669 2842.82 | | VQ | | | 13+35 1928.8238 2868.71 | | Q | | | 13+40 1948.7681 2895.91 | | VQ | | | 13+45 1968.9096 2924.53 | | VQ | | | 13+50 1989.2571 2954.47 | | VQ | | | 13+55 2009.8198 2985.70 | | VQ | | | 14+ 0 2030.6082 3018.48 | | VQ | | | 14+ 5 2051.6986 3062.33 | | VQ | | | 14+10 2073.1672 3117.24 | | VQ | | | 14+15 2095.0451 3176.67 | | VQ | | | 14+20 2117.3958 3245.33 | | VQ | | | 14+25 2140.2579 3319.57 | | V Q | | | 14+30 2163.6735 3399.95 | | V Q | | | 14+35 2187.7643 3497.97 | | V Q | | | 14+40 2212.6292 3610.39 | | V Q | | | 14+45 2238.3292 3731.64 | | V Q | | | 14+50 2264.9002 3858.12 | | V Q | | | 14+55 2292.3591 3987.02 | | V Q| | | 15+ 0 2320.6778 4111.88 | | V Q | | 15+ 5 2349.7922 4227.41 | | V Q | | 15+10 2379.6994 4342.52 | | V |Q | | 15+15 2410.3716 4453.60 | | V |Q | | 15+20 2441.8024 4563.76 | | V | Q | | 15+25 2473.8884 4658.88 | | V | Q | | 15+30 2506.5726 4745.75 | | V | Q | | 15+35 2539.8572 4832.92 | | V | Q | | 15+40 2573.7289 4918.17 | | V | Q | | 15+45 2608.2358 5010.41 | | V | Q | | 15+50 2643.4731 5116.45 | | V | Q | | 15+55 2679.5066 5232.05 | | V | Q | | 16+ 0 2716.5963 5385.44 | | V | Q | | 16+ 5 2755.8661 5701.97 | | V | Q | | 16+10 2797.2807 6013.40 | | V | Q| | 16+15 2840.1561 6225.51 | | V| Q | 16+20 2884.9566 6505.04 | | V| |Q | 16+25 2931.5379 6763.60 | | V| | Q |

16+30 2980.2181 7068.37 | | V | Q | 16+35 3032.1908 7546.43 | | V | Q | 16+40 3086.7389 7920.39 | | V | Q | 16+45 3142.7371 8130.94 | | |V | Q| 16+50 3199.1881 8196.68 | | |V | Q| 16+55 3255.2866 8145.50 | | | V | Q| 17+ 0 3309.9296 7934.16 | | | V | Q | 17+ 5 3362.4124 7620.50 | | | V | Q | 17+10 3413.5289 7422.12 | | | V | Q | 17+15 3462.8672 7163.91 | | | V | Q | 17+20 3510.5991 6930.68 | | | V | Q | 17+25 3556.5545 6672.72 | | | V | Q | 17+30 3601.3622 6506.07 | | | V |Q | 17+35 3644.7285 6296.80 | | | V Q | 17+40 3686.7599 6102.96 | | | V Q| | 17+45 3727.2836 5884.03 | | | V Q | | 17+50 3766.6529 5716.43 | | | V Q | | 17+55 3804.8135 5540.93 | | | V Q | | 18+ 0 3841.8036 5370.95 | | | VQ | | 18+ 5 3877.6008 5197.76 | | | QV | | 18+10 3912.5050 5068.08 | | | Q V | | 18+15 3946.5686 4946.04 | | | Q V | | 18+20 3979.8128 4827.07 | | | Q V | | 18+25 4012.2568 4710.86 | | | Q V | | 18+30 4044.0906 4622.27 | | | Q V | | 18+35 4075.3527 4539.26 | | | Q V | | 18+40 4105.9792 4446.97 | | |Q V | | 18+45 4136.0179 4361.61 | | |Q V | | 18+50 4165.6071 4296.35 | | Q V | | 18+55 4194.7529 4231.98 | | Q V | | 19+ 0 4223.3543 4152.91 | | Q V | | 19+ 5 4251.4766 4083.36 | | Q| V | | 19+10 4279.2106 4026.98 | | Q| V | | 19+15 4306.5472 3969.28 | | Q| V| | 19+20 4333.3930 3898.01 | | Q| V| | 19+25 4359.8335 3839.15 | | Q | V| | 19+30 4385.9294 3789.13 | | Q | V| | 19+35 4411.6746 3738.20 | | Q | V| | 19+40 4437.0099 3678.69 | | Q | V | 19+45 4462.0043 3629.18 | | Q | V | 19+50 4486.6799 3582.90 | | Q | V | 19+55 4511.0122 3533.05 | | Q | V | 20+ 0 4534.9273 3472.47 | | Q | V | 20+ 5 4558.5365 3428.06 | | Q | V | 20+10 4581.8712 3388.20 | | Q | V | 20+15 4604.9198 3346.65 | | Q | |V | 20+20 4627.6484 3300.19 | | Q | |V | 20+25 4650.1184 3262.64 | | Q | |V | 20+30 4672.3378 3226.26 | | Q | |V | 20+35 4694.2846 3186.67 | | Q | |V | 20+40 4715.9385 3144.15 | | Q | |V | 20+45 4737.3700 3111.85 | | Q | | V | 20+50 4758.5924 3081.50 | | Q | | V | 20+55 4779.6055 3051.10 | | Q | | V | 21+ 0 4800.4100 3020.81 | | Q | | V | 21+ 5 4821.0100 2991.13 | | Q | | V | 21+10 4841.3957 2960.00 | | Q | | V | 21+15 4861.5184 2921.81 | | Q | | V | 21+20 4881.3901 2885.37 | | Q | | V | 21+25 4901.0832 2859.44 | | Q | | V | 21+30 4920.6093 2835.19 | | Q | | V | 21+35 4939.9707 2811.28 | | Q | | V | 21+40 4959.1691 2787.62 | | Q | | V | 21+45 4978.2049 2763.99 | | Q | | V | 21+50 4997.0751 2739.96 | | Q | | V | 21+55 5015.7648 2713.74 | | Q | | V | 22+ 0 5034.2933 2690.34 | | Q | | V | 22+ 5 5052.6763 2669.22 | | Q | | V | 22+10 5070.9169 2648.54 | | Q | | V | 22+15 5089.0152 2627.87 | | Q | | V | 22+20 5106.9722 2607.35 | | Q | | V |

22+25 5124.7802 2585.73 | | Q | | V | 22+30 5142.4217 2561.55 | | Q | | V | 22+35 5159.8512 2530.76 | | Q | | V | 22+40 5177.1314 2509.09 | | Q | | V | 22+45 5194.2856 2490.79 | | Q | | V | 22+50 5211.3186 2473.19 | | Q | | V | 22+55 5228.2287 2455.35 | |Q | | V | 23+ 0 5245.0164 2437.57 | |Q | | V | 23+ 5 5261.6793 2419.45 | |Q | | V | 23+10 5278.2061 2399.69 | |Q | | V | 23+15 5294.5864 2378.42 | |Q | | V | 23+20 5310.8489 2361.32 | |Q | | V | 23+25 5326.9999 2345.13 | |Q | | V | 23+30 5343.0413 2329.21 | |Q | | V | 23+35 5358.9760 2313.72 | |Q | | V | 23+40 5374.8043 2298.27 | |Q | | V | 23+45 5390.5237 2282.45 | |Q | | V | 23+50 5406.1216 2264.81 | |Q | | V | 23+55 5421.6000 2247.47 | Q | | V | 24+ 0 5436.9788 2233.00 | Q | | V | 24+ 5 5452.1934 2209.16 | Q | | V | 24+10 5467.1750 2175.33 | Q | | V | 24+15 5481.9033 2138.54 | Q | | V | 24+20 5496.3243 2093.94 | Q | | V | 24+25 5510.4097 2045.20 | Q| | | V | 24+30 5524.1226 1991.10 | Q| | | V | 24+35 5537.3571 1921.66 | Q| | | V | 24+40 5550.0329 1840.53 | Q | | | V | 24+45 5562.1028 1752.55 | Q | | | V | 24+50 5573.5453 1661.44 | Q | | | V | 24+55 5584.3592 1570.19 | Q | | | V | 25+ 0 5594.5911 1485.67 | Q | | | V | 25+ 5 5604.3209 1412.77 | Q | | | V | 25+10 5613.5515 1340.28 | Q | | | V | 25+15 5622.3728 1280.85 | Q | | | V | 25+20 5630.8377 1229.10 | Q | | | V | 25+25 5639.0013 1185.35 | Q | | | V | 25+30 5646.8775 1143.62 | Q | | | V | 25+35 5654.4941 1105.94 | Q | | | V | 25+40 5661.8653 1070.30 | Q | | | V | 25+45 5669.0135 1037.91 | Q | | | V | 25+50 5675.9371 1005.32 | Q | | | V | 25+55 5682.6588 975.99 | Q | | | V | 26+ 0 5689.1890 948.19 | Q | | | V | 26+ 5 5695.5505 923.68 | Q | | | V | 26+10 5701.7219 896.08 | Q | | | V | 26+15 5707.7322 872.70 | Q | | | V | 26+20 5713.5912 850.73 | Q | | | V | 26+25 5719.3119 830.65 | Q | | | V | 26+30 5724.8944 810.58 | Q | | | V | 26+35 5730.3403 790.74 | Q | | | V | 26+40 5735.6574 772.05 | Q | | | V | 26+45 5740.8542 754.58 | Q | | | V | 26+50 5745.9321 737.31 | Q | | | V | 26+55 5750.8916 720.12 | Q | | | V | 27+ 0 5755.7366 703.50 | Q | | | V | 27+ 5 5760.4666 686.79 | Q | | | V | 27+10 5765.0829 670.29 | Q | | | V | 27+15 5769.5860 653.85 | Q | | | V| 27+20 5773.9835 638.51 | Q | | | V| 27+25 5778.2785 623.64 | Q | | | V| 27+30 5782.4712 608.78 | Q | | | V| 27+35 5786.5619 593.97 | Q | | | V| 27+40 5790.5556 579.88 | Q | | | V| 27+45 5794.4534 565.96 | Q | | | V| 27+50 5798.2550 551.99 | Q | | | V| 27+55 5801.9611 538.12 | Q | | | V| 28+ 0 5805.5786 525.26 | Q | | | V| 28+ 5 5809.1082 512.50 | Q | | | V| 28+10 5812.5489 499.60 | Q | | | V| 28+15 5815.9008 486.69 | Q | | | V|

28+20 5819.1718 474.95 | Q | | | V| 28+25 5822.3683 464.12 | Q | | | V| 28+30 5825.4879 452.97 | Q | | | V| 28+35 5828.5290 441.57 | Q | | | V| 28+40 5831.4908 430.05 | Q | | | V| 28+45 5834.3663 417.52 | Q | | | V| 28+50 5837.1450 403.48 |Q | | | V| 28+55 5839.8068 386.49 |Q | | | V| 29+ 0 5842.2827 359.50 |Q | | | V| 29+ 5 5844.5654 331.45 |Q | | | V| 29+10 5846.7610 318.80 |Q | | | V| 29+15 5848.8868 308.67 |Q | | | V| 29+20 5850.9480 299.28 |Q | | | V| 29+25 5852.9409 289.38 |Q | | | V| 29+30 5854.8685 279.88 |Q | | | V| 29+35 5856.7328 270.70 |Q | | | V| 29+40 5858.5357 261.78 |Q | | | V| 29+45 5860.2787 253.08 |Q | | | V| 29+50 5861.9632 244.59 |Q | | | V| 29+55 5863.5920 236.50 |Q | | | V| 30+ 0 5865.1709 229.26 |Q | | | V| 30+ 5 5866.7066 222.98 |Q | | | V| 30+10 5868.2000 216.85 |Q | | | V| 30+15 5869.6521 210.85 |Q | | | V| 30+20 5871.0638 204.97 Q | | | V| 30+25 5872.4357 199.20 Q | | | V| 30+30 5873.7692 193.63 Q | | | V| 30+35 5875.0693 188.78 Q | | | V| 30+40 5876.3375 184.13 Q | | | V| 30+45 5877.5741 179.56 Q | | | V| 30+50 5878.7798 175.07 Q | | | V| 30+55 5879.9551 170.65 Q | | | V| 31+ 0 5881.1000 166.24 Q | | | V| 31+ 5 5882.2143 161.80 Q | | | V| 31+10 5883.2990 157.50 Q | | | V| 31+15 5884.3563 153.51 Q | | | V| 31+20 5885.3865 149.59 Q | | | V| 31+25 5886.3900 145.71 Q | | | V| 31+30 5887.3672 141.88 Q | | | V| 31+35 5888.3183 138.10 Q | | | V| 31+40 5889.2436 134.36 Q | | | V| 31+45 5890.1435 130.66 Q | | | V| 31+50 5891.0191 127.13 Q | | | V| 31+55 5891.8716 123.79 Q | | | V| 32+ 0 5892.7014 120.49 Q | | | V| 32+ 5 5893.5087 117.22 Q | | | V| 32+10 5894.2937 113.98 Q | | | V| 32+15 5895.0567 110.78 Q | | | V| 32+20 5895.7978 107.61 Q | | | V| 32+25 5896.5172 104.47 Q | | | V| 32+30 5897.2160 101.46 Q | | | V| 32+35 5897.8947 98.54 Q | | | V| 32+40 5898.5534 95.64 Q | | | V| 32+45 5899.1923 92.77 Q | | | V| 32+50 5899.8116 89.93 Q | | | V| 32+55 5900.4115 87.10 Q | | | V| 33+ 0 5900.9921 84.31 Q | | | V| 33+ 5 5901.5539 81.58 Q | | | V| 33+10 5902.0995 79.21 Q | | | V| 33+15 5902.6293 76.93 Q | | | V| 33+20 5903.1436 74.67 Q | | | V| 33+25 5903.6424 72.43 Q | | | V| 33+30 5904.1260 70.21 Q | | | V| 33+35 5904.5944 68.01 Q | | | V| 33+40 5905.0477 65.82 Q | | | V| 33+45 5905.4863 63.69 Q | | | V| 33+50 5905.9112 61.69 Q | | | V| 33+55 5906.3225 59.72 Q | | | V| 34+ 0 5906.7202 57.75 Q | | | V| 34+ 5 5907.1041 55.74 Q | | | V| 34+10 5907.4757 53.95 Q | | | V|

34+15 5907.8350 52.18 Q | | | V| 34+20 5908.1822 50.41 Q | | | V| 34+25 5908.5174 48.66 Q | | | V| 34+30 5908.8405 46.92 Q | | | V| 34+35 5909.1518 45.20 Q | | | V| 34+40 5909.4512 43.48 Q | | | V| 34+45 5909.7389 41.78 Q | | | V| 34+50 5910.0150 40.08 Q | | | V| 34+55 5910.2795 38.40 Q | | | V| 35+ 0 5910.5325 36.73 Q | | | V| 35+ 5 5910.7740 35.07 Q | | | V| 35+10 5911.0042 33.42 Q | | | V| 35+15 5911.2231 31.78 Q | | | V| 35+20 5911.4307 30.15 Q | | | V| 35+25 5911.6273 28.53 Q | | | V| 35+30 5911.8127 26.92 Q | | | V| 35+35 5911.9871 25.32 Q | | | V| 35+40 5912.1505 23.73 Q | | | V| 35+45 5912.3030 22.15 Q | | | V| 35+50 5912.4447 20.57 Q | | | V| 35+55 5912.5756 19.01 Q | | | V| 36+ 0 5912.6958 17.45 Q | | | V| -----------------------------------------------------------------------

Area 2

1. Enter the design storm return frequency (year) 100

2. Enter flow length (feet) 12196

Flow length (miles) 2.31

3. Enter the centroidal length (feet) 5481

Centroidal length (miles) 1.04

4. Enter upstream elevation 4070

Enter downstream elevation 3365

Difference in elevation 705

5. Enter the watershed area (acres) 466.0

6. Enter the S-Graph proportions (decimal)

Valley DevelopedValley UndevelopedFoothillMountainDesert 1.0

7. Basin Factor, n= 0.04

8. Enter the pervious fraction 1.0

9. Enter the area averaged Curve Number 53.2

10. Enter area-averaged point rainfall (inches)


1-Hour 1.243-Hour 1.86-Hour 2.31

24-Hour 4.26

UNIT HYDROGRAPH METHOD SUMMARYAGINCOURT AREA 2



AREA 2 Chaparral, Broadleaf (Fair) AMC 1 A 23.0 167.0 3841.0 35.8%Chaparral, Broadleaf (Fair) AMC 2 A 40.0 16.9 676.0 3.6%Chaparral, Broadleaf (Fair) AMC 1 D 64.4 154.8 9969.1 33.2%Chaparral, Broadleaf (Fair) AMC 2 D 81.0 127.3 10311.3 27.3%

100%TOTAL MAP AREA= 466.0

TOTAL WEIGHTING= 24797.4TOTAL AVERAGED VALUE= 53.2

CURVE NUMBER AREA-AVERAGINGAGINCOURT AVERAGE CURVE NUMBER


U n i t H y d r o g r a p h A n a l y s i s

Copyright (c) CIVILCADD/CIVILDESIGN, 1989 - 2004, Version 7.0

Study date 12/01/11

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++------------------------------------------------------------------------

San Bernardino County Synthetic Unit Hydrology MethodManual date - August 1986


---------------------------------------------------------------------WDG SOLAR - AGINCOURTPRE-DEVELOPMENT CONDITION - OFFSITE AREA100-YEAR 24-HOUR STORM EVENT, AREA 2BY: CRC--------------------------------------------------------------------

Storm Event Year = 100

Antecedent Moisture Condition = 2

English (in-lb) Input Units Used

English Rainfall Data (Inches) Input Values Used

English Units used in output format

Area averaged rainfall intensity isohyetal data:Sub-Area Duration Isohyetal(Ac.) (hours) (In)

Rainfall data for year 100 466.00 1 1.24

--------------------------------------------------------------------Rainfall data for year 100

466.00 6 2.31--------------------------------------------------------------------Rainfall data for year 100

466.00 24 4.26--------------------------------------------------------------------++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

******** Area-averaged max loss rate, Fm ********

SCS curve SCS curve Area Area Fp(Fig C6) Ap FmNo.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)53.2 53.2 466.00 1.000 0.770 1.000 0.770

Area-averaged adjusted loss rate Fm (In/Hr) = 0.770

********* Area-Averaged low loss rate fraction, Yb **********

Area Area SCS CN SCS CN S Pervious(Ac.) Fract (AMC2) (AMC2) Yield Fr 466.00 1.000 53.2 53.2 8.80 0.130

Area-averaged catchment yield fraction, Y = 0.130Area-averaged low loss fraction, Yb = 0.870++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++Watercourse length = 12196.00(Ft.)Length from concentration point to centroid = 5481.00(Ft.)

Elevation difference along watercourse = 705.00(Ft.)Mannings friction factor along watercourse = 0.040Watershed area = 466.00(Ac.)Catchment Lag time = 0.451 hoursUnit interval = 5.000 minutesUnit interval percentage of lag time = 18.4627Hydrograph baseflow = 0.00(CFS)Average maximum watershed loss rate(Fm) = 0.770(In/Hr)Average low loss rate fraction (Yb) = 0.870 (decimal)DESERT S-Graph SelectedComputed peak 5-minute rainfall = 0.363(In)Computed peak 30-minute rainfall = 0.913(In)Specified peak 1-hour rainfall = 1.240(In)Computed peak 3-hour rainfall = 1.800(In)Specified peak 6-hour rainfall = 2.310(In)Specified peak 24-hour rainfall = 4.260(In)

Note: user specified rainfall values used.Rainfall depth area reduction factors:Using a total area of 466.00(Ac.) (Ref: fig. E-4)

5-minute factor = 0.978 Adjusted rainfall = 0.355(In)30-minute factor = 0.978 Adjusted rainfall = 0.893(In)1-hour factor = 0.978 Adjusted rainfall = 1.213(In)3-hour factor = 0.997 Adjusted rainfall = 1.795(In)6-hour factor = 0.999 Adjusted rainfall = 2.307(In)24-hour factor = 0.999 Adjusted rainfall = 4.258(In)---------------------------------------------------------------------

U n i t H y d r o g r a p h +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++Interval 'S' Graph Unit HydrographNumber Mean values ((CFS))---------------------------------------------------------------------

(K = 5635.69 (CFS))

1 0.889 50.123 2 3.961 173.090 3 9.448 309.272 4 21.196 662.071 5 38.077 951.330 6 50.611 706.408 7 59.337 491.748 8 65.367 339.861 9 70.146 269.30110 74.019 218.26811 77.257 182.49612 79.926 150.43213 82.217 129.08814 84.195 111.49315 85.998 101.62216 87.594 89.90617 88.967 77.37118 90.080 62.74719 91.127 59.01720 92.081 53.75721 92.950 48.95722 93.755 45.40123 94.424 37.68024 95.052 35.37725 95.650 33.74326 96.141 27.63427 96.621 27.05328 97.039 23.54329 97.371 18.75730 97.700 18.54531 97.931 13.00132 98.116 10.40533 98.305 10.66734 98.522 12.228

35 98.744 12.48636 98.965 12.48637 99.187 12.48638 99.408 12.46439 99.568 9.00440 99.683 6.50341 99.798 6.50342 99.914 6.50343 100.000 4.860---------------------------------------------------------------------Peak Unit Adjusted mass rainfall Unit rainfallNumber (In) (In) 1 0.3551 0.3551 2 0.5073 0.1522 3 0.6251 0.1177 4 0.7248 0.0998 5 0.8131 0.0882 6 0.8931 0.0800 7 0.9560 0.0629 8 1.0140 0.0581 9 1.0682 0.054110 1.1191 0.050911 1.1672 0.048112 1.2129 0.045713 1.2481 0.035114 1.2815 0.033415 1.3134 0.031916 1.3440 0.030617 1.3734 0.029418 1.4017 0.028319 1.4290 0.027320 1.4554 0.026421 1.4810 0.025622 1.5058 0.024823 1.5298 0.024124 1.5532 0.023425 1.5760 0.022826 1.5982 0.022227 1.6199 0.021728 1.6411 0.021229 1.6617 0.020730 1.6820 0.020231 1.7018 0.019832 1.7211 0.019433 1.7401 0.019034 1.7588 0.018635 1.7771 0.018336 1.7950 0.018037 1.8129 0.017938 1.8305 0.017639 1.8478 0.017340 1.8648 0.017041 1.8815 0.016742 1.8980 0.016543 1.9142 0.016244 1.9302 0.016045 1.9459 0.015846 1.9615 0.015547 1.9768 0.015348 1.9919 0.015149 2.0068 0.014950 2.0216 0.014751 2.0361 0.014552 2.0504 0.014453 2.0646 0.014254 2.0786 0.014055 2.0925 0.013856 2.1062 0.013757 2.1197 0.013558 2.1331 0.013459 2.1463 0.0132

60 2.1594 0.013161 2.1723 0.013062 2.1852 0.012863 2.1979 0.012764 2.2104 0.012665 2.2228 0.012466 2.2352 0.012367 2.2473 0.012268 2.2594 0.012169 2.2714 0.012070 2.2832 0.011971 2.2950 0.011772 2.3066 0.011673 2.3207 0.014174 2.3347 0.014075 2.3486 0.013976 2.3624 0.013877 2.3761 0.013778 2.3897 0.013679 2.4032 0.013580 2.4166 0.013481 2.4299 0.013382 2.4431 0.013283 2.4563 0.013184 2.4693 0.013085 2.4823 0.013086 2.4951 0.012987 2.5079 0.012888 2.5206 0.012789 2.5333 0.012690 2.5458 0.012591 2.5583 0.012592 2.5707 0.012493 2.5830 0.012394 2.5952 0.012295 2.6074 0.012296 2.6195 0.012197 2.6315 0.012098 2.6435 0.012099 2.6554 0.0119100 2.6672 0.0118101 2.6789 0.0118102 2.6906 0.0117103 2.7023 0.0116104 2.7138 0.0116105 2.7253 0.0115106 2.7368 0.0114107 2.7482 0.0114108 2.7595 0.0113109 2.7708 0.0113110 2.7820 0.0112111 2.7931 0.0112112 2.8042 0.0111113 2.8153 0.0110114 2.8263 0.0110115 2.8372 0.0109116 2.8481 0.0109117 2.8589 0.0108118 2.8697 0.0108119 2.8804 0.0107120 2.8911 0.0107121 2.9017 0.0106122 2.9123 0.0106123 2.9228 0.0105124 2.9333 0.0105125 2.9437 0.0104126 2.9541 0.0104127 2.9645 0.0103128 2.9748 0.0103129 2.9850 0.0103130 2.9952 0.0102

131 3.0054 0.0102132 3.0155 0.0101133 3.0256 0.0101134 3.0356 0.0100135 3.0456 0.0100136 3.0556 0.0100137 3.0655 0.0099138 3.0754 0.0099139 3.0852 0.0098140 3.0950 0.0098141 3.1047 0.0098142 3.1145 0.0097143 3.1241 0.0097144 3.1338 0.0096145 3.1434 0.0096146 3.1529 0.0096147 3.1625 0.0095148 3.1720 0.0095149 3.1814 0.0095150 3.1908 0.0094151 3.2002 0.0094152 3.2096 0.0094153 3.2189 0.0093154 3.2282 0.0093155 3.2374 0.0093156 3.2467 0.0092157 3.2558 0.0092158 3.2650 0.0092159 3.2741 0.0091160 3.2832 0.0091161 3.2923 0.0091162 3.3013 0.0090163 3.3103 0.0090164 3.3192 0.0090165 3.3282 0.0089166 3.3371 0.0089167 3.3459 0.0089168 3.3548 0.0088169 3.3636 0.0088170 3.3724 0.0088171 3.3811 0.0088172 3.3899 0.0087173 3.3986 0.0087174 3.4072 0.0087175 3.4159 0.0086176 3.4245 0.0086177 3.4331 0.0086178 3.4417 0.0086179 3.4502 0.0085180 3.4587 0.0085181 3.4672 0.0085182 3.4756 0.0085183 3.4841 0.0084184 3.4925 0.0084185 3.5009 0.0084186 3.5092 0.0084187 3.5175 0.0083188 3.5258 0.0083189 3.5341 0.0083190 3.5424 0.0083191 3.5506 0.0082192 3.5588 0.0082193 3.5670 0.0082194 3.5752 0.0082195 3.5833 0.0081196 3.5914 0.0081197 3.5995 0.0081198 3.6076 0.0081199 3.6156 0.0080200 3.6236 0.0080201 3.6316 0.0080

202 3.6396 0.0080203 3.6476 0.0080204 3.6555 0.0079205 3.6634 0.0079206 3.6713 0.0079207 3.6792 0.0079208 3.6870 0.0078209 3.6948 0.0078210 3.7026 0.0078211 3.7104 0.0078212 3.7182 0.0078213 3.7259 0.0077214 3.7337 0.0077215 3.7414 0.0077216 3.7490 0.0077217 3.7567 0.0077218 3.7643 0.0076219 3.7720 0.0076220 3.7796 0.0076221 3.7872 0.0076222 3.7947 0.0076223 3.8023 0.0075224 3.8098 0.0075225 3.8173 0.0075226 3.8248 0.0075227 3.8323 0.0075228 3.8397 0.0075229 3.8472 0.0074230 3.8546 0.0074231 3.8620 0.0074232 3.8694 0.0074233 3.8767 0.0074234 3.8841 0.0073235 3.8914 0.0073236 3.8987 0.0073237 3.9060 0.0073238 3.9133 0.0073239 3.9206 0.0073240 3.9278 0.0072241 3.9350 0.0072242 3.9422 0.0072243 3.9494 0.0072244 3.9566 0.0072245 3.9638 0.0072246 3.9709 0.0071247 3.9780 0.0071248 3.9852 0.0071249 3.9923 0.0071250 3.9993 0.0071251 4.0064 0.0071252 4.0134 0.0070253 4.0205 0.0070254 4.0275 0.0070255 4.0345 0.0070256 4.0415 0.0070257 4.0485 0.0070258 4.0554 0.0070259 4.0624 0.0069260 4.0693 0.0069261 4.0762 0.0069262 4.0831 0.0069263 4.0900 0.0069264 4.0968 0.0069265 4.1037 0.0069266 4.1105 0.0068267 4.1174 0.0068268 4.1242 0.0068269 4.1310 0.0068270 4.1378 0.0068271 4.1445 0.0068272 4.1513 0.0068

273 4.1580 0.0067274 4.1647 0.0067275 4.1715 0.0067276 4.1782 0.0067277 4.1848 0.0067278 4.1915 0.0067279 4.1982 0.0067280 4.2048 0.0066281 4.2115 0.0066282 4.2181 0.0066283 4.2247 0.0066284 4.2313 0.0066285 4.2379 0.0066286 4.2444 0.0066287 4.2510 0.0066288 4.2575 0.0065---------------------------------------------------------------------Unit Unit Unit EffectivePeriod Rainfall Soil-Loss Rainfall(number) (In) (In) (In)--------------------------------------------------------------------- 1 0.0065 0.0057 0.0008 2 0.0066 0.0057 0.0009 3 0.0066 0.0057 0.0009 4 0.0066 0.0057 0.0009 5 0.0066 0.0058 0.0009 6 0.0066 0.0058 0.0009 7 0.0067 0.0058 0.0009 8 0.0067 0.0058 0.0009 9 0.0067 0.0058 0.000910 0.0067 0.0058 0.000911 0.0067 0.0059 0.000912 0.0068 0.0059 0.000913 0.0068 0.0059 0.000914 0.0068 0.0059 0.000915 0.0068 0.0059 0.000916 0.0068 0.0060 0.000917 0.0069 0.0060 0.000918 0.0069 0.0060 0.000919 0.0069 0.0060 0.000920 0.0069 0.0060 0.000921 0.0070 0.0061 0.000922 0.0070 0.0061 0.000923 0.0070 0.0061 0.000924 0.0070 0.0061 0.000925 0.0070 0.0061 0.000926 0.0071 0.0061 0.000927 0.0071 0.0062 0.000928 0.0071 0.0062 0.000929 0.0071 0.0062 0.000930 0.0072 0.0062 0.000931 0.0072 0.0063 0.000932 0.0072 0.0063 0.000933 0.0072 0.0063 0.000934 0.0073 0.0063 0.000935 0.0073 0.0063 0.000936 0.0073 0.0064 0.001037 0.0073 0.0064 0.001038 0.0074 0.0064 0.001039 0.0074 0.0064 0.001040 0.0074 0.0065 0.001041 0.0075 0.0065 0.001042 0.0075 0.0065 0.001043 0.0075 0.0065 0.001044 0.0075 0.0066 0.001045 0.0076 0.0066 0.001046 0.0076 0.0066 0.001047 0.0076 0.0066 0.001048 0.0076 0.0067 0.001049 0.0077 0.0067 0.001050 0.0077 0.0067 0.0010

51 0.0077 0.0067 0.001052 0.0078 0.0068 0.001053 0.0078 0.0068 0.001054 0.0078 0.0068 0.001055 0.0079 0.0068 0.001056 0.0079 0.0069 0.001057 0.0079 0.0069 0.001058 0.0080 0.0069 0.001059 0.0080 0.0070 0.001060 0.0080 0.0070 0.001061 0.0081 0.0070 0.001062 0.0081 0.0070 0.001163 0.0081 0.0071 0.001164 0.0082 0.0071 0.001165 0.0082 0.0071 0.001166 0.0082 0.0072 0.001167 0.0083 0.0072 0.001168 0.0083 0.0072 0.001169 0.0084 0.0073 0.001170 0.0084 0.0073 0.001171 0.0084 0.0073 0.001172 0.0085 0.0074 0.001173 0.0085 0.0074 0.001174 0.0085 0.0074 0.001175 0.0086 0.0075 0.001176 0.0086 0.0075 0.001177 0.0087 0.0075 0.001178 0.0087 0.0076 0.001179 0.0088 0.0076 0.001180 0.0088 0.0076 0.001181 0.0088 0.0077 0.001182 0.0089 0.0077 0.001283 0.0089 0.0078 0.001284 0.0090 0.0078 0.001285 0.0090 0.0079 0.001286 0.0091 0.0079 0.001287 0.0091 0.0079 0.001288 0.0092 0.0080 0.001289 0.0092 0.0080 0.001290 0.0093 0.0080 0.001291 0.0093 0.0081 0.001292 0.0094 0.0081 0.001293 0.0094 0.0082 0.001294 0.0095 0.0082 0.001295 0.0095 0.0083 0.001296 0.0096 0.0083 0.001297 0.0096 0.0084 0.001398 0.0097 0.0084 0.001399 0.0098 0.0085 0.0013100 0.0098 0.0085 0.0013101 0.0099 0.0086 0.0013102 0.0099 0.0086 0.0013103 0.0100 0.0087 0.0013104 0.0100 0.0087 0.0013105 0.0101 0.0088 0.0013106 0.0102 0.0088 0.0013107 0.0103 0.0089 0.0013108 0.0103 0.0090 0.0013109 0.0104 0.0090 0.0013110 0.0104 0.0091 0.0014111 0.0105 0.0092 0.0014112 0.0106 0.0092 0.0014113 0.0107 0.0093 0.0014114 0.0107 0.0093 0.0014115 0.0108 0.0094 0.0014116 0.0109 0.0095 0.0014117 0.0110 0.0096 0.0014118 0.0110 0.0096 0.0014119 0.0112 0.0097 0.0014120 0.0112 0.0098 0.0015121 0.0113 0.0099 0.0015

122 0.0114 0.0099 0.0015123 0.0115 0.0100 0.0015124 0.0116 0.0101 0.0015125 0.0117 0.0102 0.0015126 0.0118 0.0102 0.0015127 0.0119 0.0103 0.0015128 0.0120 0.0104 0.0016129 0.0121 0.0105 0.0016130 0.0122 0.0106 0.0016131 0.0123 0.0107 0.0016132 0.0124 0.0108 0.0016133 0.0125 0.0109 0.0016134 0.0126 0.0110 0.0016135 0.0128 0.0111 0.0017136 0.0129 0.0112 0.0017137 0.0130 0.0113 0.0017138 0.0131 0.0114 0.0017139 0.0133 0.0116 0.0017140 0.0134 0.0117 0.0017141 0.0136 0.0118 0.0018142 0.0137 0.0119 0.0018143 0.0139 0.0121 0.0018144 0.0140 0.0122 0.0018145 0.0116 0.0101 0.0015146 0.0117 0.0102 0.0015147 0.0120 0.0104 0.0016148 0.0121 0.0105 0.0016149 0.0123 0.0107 0.0016150 0.0124 0.0108 0.0016151 0.0127 0.0110 0.0016152 0.0128 0.0112 0.0017153 0.0131 0.0114 0.0017154 0.0132 0.0115 0.0017155 0.0135 0.0118 0.0018156 0.0137 0.0119 0.0018157 0.0140 0.0122 0.0018158 0.0142 0.0123 0.0018159 0.0145 0.0126 0.0019160 0.0147 0.0128 0.0019161 0.0151 0.0132 0.0020162 0.0153 0.0133 0.0020163 0.0158 0.0137 0.0020164 0.0160 0.0139 0.0021165 0.0165 0.0143 0.0021166 0.0167 0.0146 0.0022167 0.0173 0.0150 0.0022168 0.0176 0.0153 0.0023169 0.0180 0.0156 0.0023170 0.0183 0.0159 0.0024171 0.0190 0.0165 0.0025172 0.0194 0.0169 0.0025173 0.0202 0.0176 0.0026174 0.0207 0.0180 0.0027175 0.0217 0.0189 0.0028176 0.0222 0.0193 0.0029177 0.0234 0.0204 0.0030178 0.0241 0.0209 0.0031179 0.0256 0.0222 0.0033180 0.0264 0.0230 0.0034181 0.0283 0.0246 0.0037182 0.0294 0.0256 0.0038183 0.0319 0.0278 0.0041184 0.0334 0.0291 0.0043185 0.0457 0.0398 0.0059186 0.0481 0.0419 0.0063187 0.0541 0.0471 0.0070188 0.0581 0.0505 0.0075189 0.0800 0.0642 0.0158190 0.0882 0.0642 0.0241191 0.1177 0.0642 0.0536192 0.1522 0.0642 0.0881

193 0.3551 0.0642 0.2909194 0.0998 0.0642 0.0356195 0.0629 0.0547 0.0082196 0.0509 0.0443 0.0066197 0.0351 0.0306 0.0046198 0.0306 0.0266 0.0040199 0.0273 0.0238 0.0035200 0.0248 0.0216 0.0032201 0.0228 0.0198 0.0030202 0.0212 0.0184 0.0027203 0.0198 0.0172 0.0026204 0.0186 0.0162 0.0024205 0.0179 0.0156 0.0023206 0.0170 0.0148 0.0022207 0.0162 0.0141 0.0021208 0.0155 0.0135 0.0020209 0.0149 0.0130 0.0019210 0.0144 0.0125 0.0019211 0.0138 0.0120 0.0018212 0.0134 0.0116 0.0017213 0.0130 0.0113 0.0017214 0.0126 0.0109 0.0016215 0.0122 0.0106 0.0016216 0.0119 0.0103 0.0015217 0.0141 0.0123 0.0018218 0.0138 0.0120 0.0018219 0.0135 0.0117 0.0018220 0.0132 0.0115 0.0017221 0.0130 0.0113 0.0017222 0.0127 0.0111 0.0017223 0.0125 0.0108 0.0016224 0.0122 0.0107 0.0016225 0.0120 0.0105 0.0016226 0.0118 0.0103 0.0015227 0.0116 0.0101 0.0015228 0.0114 0.0100 0.0015229 0.0113 0.0098 0.0015230 0.0111 0.0097 0.0014231 0.0109 0.0095 0.0014232 0.0108 0.0094 0.0014233 0.0106 0.0092 0.0014234 0.0105 0.0091 0.0014235 0.0103 0.0090 0.0013236 0.0102 0.0089 0.0013237 0.0101 0.0088 0.0013238 0.0100 0.0087 0.0013239 0.0098 0.0086 0.0013240 0.0097 0.0085 0.0013241 0.0096 0.0084 0.0012242 0.0095 0.0083 0.0012243 0.0094 0.0082 0.0012244 0.0093 0.0081 0.0012245 0.0092 0.0080 0.0012246 0.0091 0.0079 0.0012247 0.0090 0.0078 0.0012248 0.0089 0.0077 0.0012249 0.0088 0.0077 0.0011250 0.0087 0.0076 0.0011251 0.0086 0.0075 0.0011252 0.0086 0.0074 0.0011253 0.0085 0.0074 0.0011254 0.0084 0.0073 0.0011255 0.0083 0.0072 0.0011256 0.0083 0.0072 0.0011257 0.0082 0.0071 0.0011258 0.0081 0.0071 0.0011259 0.0080 0.0070 0.0010260 0.0080 0.0069 0.0010261 0.0079 0.0069 0.0010262 0.0078 0.0068 0.0010263 0.0078 0.0068 0.0010

264 0.0077 0.0067 0.0010265 0.0077 0.0067 0.0010266 0.0076 0.0066 0.0010267 0.0075 0.0066 0.0010268 0.0075 0.0065 0.0010269 0.0074 0.0065 0.0010270 0.0074 0.0064 0.0010271 0.0073 0.0064 0.0010272 0.0073 0.0063 0.0009273 0.0072 0.0063 0.0009274 0.0072 0.0062 0.0009275 0.0071 0.0062 0.0009276 0.0071 0.0062 0.0009277 0.0070 0.0061 0.0009278 0.0070 0.0061 0.0009279 0.0069 0.0060 0.0009280 0.0069 0.0060 0.0009281 0.0069 0.0060 0.0009282 0.0068 0.0059 0.0009283 0.0068 0.0059 0.0009284 0.0067 0.0059 0.0009285 0.0067 0.0058 0.0009286 0.0066 0.0058 0.0009287 0.0066 0.0057 0.0009288 0.0066 0.0057 0.0009----------------------------------------------------------------------------------------------------------------------------------------Total soil rain loss = 3.31(In)Total effective rainfall = 0.95(In)Peak flow rate in flood hydrograph = 413.05(CFS)---------------------------------------------------------------------++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 - H O U R S T O R M R u n o f f H y d r o g r a p h-------------------------------------------------------------------- Hydrograph in 5 Minute intervals ((CFS))

-------------------------------------------------------------------- Time(h+m) Volume Ac.Ft Q(CFS) 0 125.0 250.0 375.0 500.0 ----------------------------------------------------------------------- 0+ 5 0.0003 0.04 Q | | | | 0+10 0.0016 0.19 Q | | | | 0+15 0.0047 0.45 Q | | | | 0+20 0.0117 1.02 Q | | | | 0+25 0.0243 1.83 Q | | | | 0+30 0.0411 2.43 Q | | | | 0+35 0.0608 2.86 Q | | | | 0+40 0.0825 3.16 Q | | | | 0+45 0.1059 3.39 Q | | | | 0+50 0.1306 3.59 Q | | | | 0+55 0.1565 3.76 Q | | | | 1+ 0 0.1833 3.89 Q | | | | 1+ 5 0.2109 4.02 Q | | | | 1+10 0.2393 4.12 Q | | | | 1+15 0.2684 4.22 Q | | | | 1+20 0.2981 4.31 Q | | | | 1+25 0.3283 4.39 Q | | | | 1+30 0.3590 4.46 Q | | | | 1+35 0.3901 4.52 Q | | | | 1+40 0.4217 4.58 Q | | | | 1+45 0.4536 4.64 Q | | | | 1+50 0.4859 4.69 Q | | | | 1+55 0.5185 4.74 Q | | | | 2+ 0 0.5515 4.78 Q | | | | 2+ 5 0.5847 4.83 Q | | | | 2+10 0.6182 4.86 Q | | | | 2+15 0.6519 4.90 Q | | | | 2+20 0.6860 4.94 Q | | | | 2+25 0.7202 4.97 Q | | | | 2+30 0.7546 5.00 Q | | | | 2+35 0.7893 5.03 Q | | | |

2+40 0.8241 5.06 Q | | | | 2+45 0.8591 5.08 Q | | | | 2+50 0.8943 5.11 Q | | | | 2+55 0.9297 5.14 QV | | | | 3+ 0 0.9652 5.17 QV | | | | 3+ 5 1.0010 5.19 QV | | | | 3+10 1.0370 5.22 QV | | | | 3+15 1.0731 5.25 QV | | | | 3+20 1.1094 5.27 QV | | | | 3+25 1.1459 5.30 QV | | | | 3+30 1.1825 5.32 QV | | | | 3+35 1.2193 5.34 QV | | | | 3+40 1.2562 5.36 QV | | | | 3+45 1.2933 5.38 QV | | | | 3+50 1.3305 5.40 QV | | | | 3+55 1.3678 5.42 QV | | | | 4+ 0 1.4053 5.44 QV | | | | 4+ 5 1.4429 5.46 QV | | | | 4+10 1.4806 5.48 QV | | | | 4+15 1.5185 5.50 QV | | | | 4+20 1.5565 5.52 QV | | | | 4+25 1.5947 5.54 QV | | | | 4+30 1.6330 5.56 QV | | | | 4+35 1.6714 5.58 QV | | | | 4+40 1.7100 5.61 QV | | | | 4+45 1.7488 5.63 QV | | | | 4+50 1.7877 5.65 QV | | | | 4+55 1.8268 5.67 QV | | | | 5+ 0 1.8660 5.69 Q V | | | | 5+ 5 1.9053 5.72 Q V | | | | 5+10 1.9449 5.74 Q V | | | | 5+15 1.9846 5.76 Q V | | | | 5+20 2.0244 5.79 Q V | | | | 5+25 2.0644 5.81 Q V | | | | 5+30 2.1046 5.83 Q V | | | | 5+35 2.1450 5.86 Q V | | | | 5+40 2.1855 5.88 Q V | | | | 5+45 2.2262 5.91 Q V | | | | 5+50 2.2670 5.93 Q V | | | | 5+55 2.3081 5.96 Q V | | | | 6+ 0 2.3493 5.98 Q V | | | | 6+ 5 2.3907 6.01 Q V | | | | 6+10 2.4323 6.04 Q V | | | | 6+15 2.4740 6.06 Q V | | | | 6+20 2.5160 6.09 Q V | | | | 6+25 2.5581 6.12 Q V | | | | 6+30 2.6005 6.15 Q V | | | | 6+35 2.6430 6.18 Q V | | | | 6+40 2.6857 6.20 Q V | | | | 6+45 2.7287 6.23 Q V | | | | 6+50 2.7718 6.26 Q V | | | | 6+55 2.8151 6.29 Q V | | | | 7+ 0 2.8587 6.32 Q V | | | | 7+ 5 2.9024 6.35 Q V | | | | 7+10 2.9464 6.38 Q V | | | | 7+15 2.9906 6.41 Q V | | | | 7+20 3.0350 6.45 Q V | | | | 7+25 3.0796 6.48 Q V | | | | 7+30 3.1244 6.51 Q V | | | | 7+35 3.1695 6.54 Q V | | | | 7+40 3.2148 6.58 Q V | | | | 7+45 3.2603 6.61 Q V | | | | 7+50 3.3061 6.65 Q V | | | | 7+55 3.3521 6.68 Q V | | | | 8+ 0 3.3984 6.72 Q V | | | | 8+ 5 3.4449 6.75 Q V | | | | 8+10 3.4917 6.79 Q V | | | | 8+15 3.5387 6.83 Q V | | | | 8+20 3.5860 6.87 Q V | | | | 8+25 3.6336 6.91 Q V | | | | 8+30 3.6814 6.94 Q V | | | |

8+35 3.7295 6.98 Q V | | | | 8+40 3.7779 7.02 Q V | | | | 8+45 3.8265 7.07 Q V | | | | 8+50 3.8755 7.11 Q V | | | | 8+55 3.9247 7.15 Q V | | | | 9+ 0 3.9743 7.19 Q V | | | | 9+ 5 4.0241 7.24 Q V | | | | 9+10 4.0743 7.28 Q V | | | | 9+15 4.1247 7.33 Q V | | | | 9+20 4.1755 7.37 Q V | | | | 9+25 4.2266 7.42 Q V | | | | 9+30 4.2780 7.47 Q V | | | | 9+35 4.3298 7.52 Q V | | | | 9+40 4.3819 7.57 Q V | | | | 9+45 4.4344 7.62 Q V | | | | 9+50 4.4872 7.67 Q V | | | | 9+55 4.5404 7.72 Q V | | | | 10+ 0 4.5939 7.78 Q V | | | | 10+ 5 4.6478 7.83 Q V | | | | 10+10 4.7022 7.89 Q V | | | | 10+15 4.7569 7.94 Q V | | | | 10+20 4.8120 8.00 Q V | | | | 10+25 4.8675 8.06 Q V | | | | 10+30 4.9234 8.12 Q V | | | | 10+35 4.9797 8.18 Q V | | | | 10+40 5.0365 8.25 Q V | | | | 10+45 5.0938 8.31 Q V | | | | 10+50 5.1515 8.38 Q V | | | | 10+55 5.2096 8.44 Q V | | | | 11+ 0 5.2682 8.51 Q V | | | | 11+ 5 5.3274 8.58 Q V | | | | 11+10 5.3870 8.66 Q V | | | | 11+15 5.4471 8.73 Q V | | | | 11+20 5.5077 8.81 Q V | | | | 11+25 5.5689 8.88 Q V | | | | 11+30 5.6307 8.96 Q V | | | | 11+35 5.6930 9.05 Q V | | | | 11+40 5.7558 9.13 Q V | | | | 11+45 5.8193 9.22 Q V | | | | 11+50 5.8834 9.30 Q V | | | | 11+55 5.9481 9.40 Q V | | | | 12+ 0 6.0134 9.49 Q V | | | | 12+ 5 6.0793 9.57 Q V | | | | 12+10 6.1455 9.61 Q V | | | | 12+15 6.2117 9.61 Q V | | | | 12+20 6.2770 9.49 Q V | | | | 12+25 6.3409 9.28 Q V | | | | 12+30 6.4040 9.15 Q V | | | | 12+35 6.4666 9.10 Q V | | | | 12+40 6.5293 9.10 Q V | | | | 12+45 6.5921 9.13 Q V | | | | 12+50 6.6553 9.17 Q V | | | | 12+55 6.7190 9.24 Q V | | | | 13+ 0 6.7832 9.32 Q V | | | | 13+ 5 6.8480 9.41 Q V | | | | 13+10 6.9135 9.51 Q V | | | | 13+15 6.9798 9.63 Q V | | | | 13+20 7.0469 9.75 Q V | | | | 13+25 7.1150 9.88 Q V | | | | 13+30 7.1840 10.03 Q V | | | | 13+35 7.2541 10.18 Q V | | | | 13+40 7.3254 10.34 Q V | | | | 13+45 7.3978 10.51 Q V | | | | 13+50 7.4714 10.70 Q V | | | | 13+55 7.5465 10.89 Q V | | | | 14+ 0 7.6229 11.10 Q V | | | | 14+ 5 7.7009 11.32 Q V | | | | 14+10 7.7804 11.55 Q V | | | | 14+15 7.8616 11.79 Q V | | | | 14+20 7.9445 12.04 Q V | | | | 14+25 8.0292 12.29 Q V | | | |

14+30 8.1158 12.57 |Q V | | | | 14+35 8.2045 12.89 |Q V | | | | 14+40 8.2956 13.23 |Q V| | | | 14+45 8.3893 13.60 |Q V| | | | 14+50 8.4858 14.01 |Q V| | | | 14+55 8.5853 14.45 |Q V| | | | 15+ 0 8.6882 14.93 |Q V| | | | 15+ 5 8.7947 15.47 |Q V| | | | 15+10 8.9053 16.05 |Q V| | | | 15+15 9.0204 16.71 |Q V| | | | 15+20 9.1405 17.45 |Q V| | | | 15+25 9.2668 18.34 |Q V | | | 15+30 9.4011 19.49 |Q V | | | 15+35 9.5455 20.96 |Q V | | | 15+40 9.7041 23.03 |Q V | | | 15+45 9.8836 26.07 | Q V | | | 15+50 10.0934 30.45 | Q |V | | | 15+55 10.3575 38.35 | Q |V | | | 16+ 0 10.7379 55.24 | Q |V | | | 16+ 5 11.3947 95.36 | Q | V | | | 16+10 12.5153 162.72 | | Q | | | 16+15 14.1793 241.61 | | V Q| | | 16+20 16.6133 353.41 | | V | Q | | 16+25 19.4580 413.05 | | |V | Q | 16+30 21.7032 326.01 | | | V Q | | 16+35 23.3630 240.99 | | Q| V | | 16+40 24.6082 180.81 | | Q | V | | 16+45 25.6215 147.13 | |Q | V | | 16+50 26.4698 123.17 | Q| | V | | 16+55 27.1958 105.42 | Q | | V| | 17+ 0 27.8201 90.64 | Q | | V | 17+ 5 28.3701 79.87 | Q | | V | 17+10 28.8602 71.16 | Q | | |V | 17+15 29.3063 64.78 | Q | | |V | 17+20 29.7075 58.25 | Q | | | V | 17+25 30.0649 51.88 | Q | | | V | 17+30 30.3803 45.80 | Q | | | V | 17+35 30.6744 42.71 | Q | | | V | 17+40 30.9473 39.62 | Q | | | V | 17+45 31.2000 36.69 | Q | | | V | 17+50 31.4347 34.09 | Q | | | V | 17+55 31.6469 30.81 | Q | | | V | 18+ 0 31.8461 28.91 | Q | | | V | 18+ 5 32.0337 27.24 | Q | | | V | 18+10 32.2040 24.74 |Q | | | V | 18+15 32.3658 23.49 |Q | | | V | 18+20 32.5157 21.76 |Q | | | V | 18+25 32.6529 19.91 |Q | | | V | 18+30 32.7839 19.03 |Q | | | V | 18+35 32.9017 17.09 |Q | | | V | 18+40 33.0124 16.08 |Q | | | V | 18+45 33.1225 15.99 |Q | | | V | 18+50 33.2344 16.24 |Q | | | V | 18+55 33.3453 16.11 |Q | | | V | 19+ 0 33.4544 15.83 |Q | | | V | 19+ 5 33.5606 15.42 |Q | | | V | 19+10 33.6625 14.81 |Q | | | V | 19+15 33.7549 13.41 |Q | | | V | 19+20 33.8398 12.33 Q | | | V | 19+25 33.9218 11.90 Q | | | V | 19+30 34.0000 11.35 Q | | | V | 19+35 34.0710 10.32 Q | | | V | 19+40 34.1311 8.72 Q | | | V | 19+45 34.1891 8.43 Q | | | V | 19+50 34.2461 8.27 Q | | | V | 19+55 34.3020 8.13 Q | | | V | 20+ 0 34.3571 8.00 Q | | | V | 20+ 5 34.4114 7.88 Q | | | V | 20+10 34.4650 7.77 Q | | | V | 20+15 34.5177 7.66 Q | | | V | 20+20 34.5698 7.56 Q | | | V |

20+25 34.6212 7.46 Q | | | V | 20+30 34.6719 7.37 Q | | | V | 20+35 34.7220 7.27 Q | | | V | 20+40 34.7715 7.18 Q | | | V | 20+45 34.8204 7.10 Q | | | V | 20+50 34.8687 7.02 Q | | | V | 20+55 34.9165 6.94 Q | | | V | 21+ 0 34.9637 6.86 Q | | | V | 21+ 5 35.0105 6.79 Q | | | V | 21+10 35.0567 6.72 Q | | | V | 21+15 35.1025 6.65 Q | | | V | 21+20 35.1478 6.58 Q | | | V | 21+25 35.1927 6.51 Q | | | V | 21+30 35.2371 6.45 Q | | | V | 21+35 35.2810 6.38 Q | | | V | 21+40 35.3246 6.32 Q | | | V | 21+45 35.3677 6.26 Q | | | V | 21+50 35.4104 6.20 Q | | | V | 21+55 35.4527 6.14 Q | | | V | 22+ 0 35.4947 6.09 Q | | | V | 22+ 5 35.5362 6.03 Q | | | V | 22+10 35.5774 5.98 Q | | | V | 22+15 35.6182 5.93 Q | | | V | 22+20 35.6587 5.88 Q | | | V | 22+25 35.6989 5.83 Q | | | V | 22+30 35.7387 5.78 Q | | | V | 22+35 35.7781 5.73 Q | | | V| 22+40 35.8173 5.69 Q | | | V| 22+45 35.8562 5.64 Q | | | V| 22+50 35.8947 5.60 Q | | | V| 22+55 35.9330 5.55 Q | | | V| 23+ 0 35.9709 5.51 Q | | | V| 23+ 5 36.0086 5.47 Q | | | V| 23+10 36.0460 5.43 Q | | | V| 23+15 36.0831 5.39 Q | | | V| 23+20 36.1200 5.35 Q | | | V| 23+25 36.1566 5.31 Q | | | V| 23+30 36.1929 5.28 Q | | | V| 23+35 36.2290 5.24 Q | | | V| 23+40 36.2649 5.20 Q | | | V| 23+45 36.3005 5.17 Q | | | V| 23+50 36.3358 5.14 Q | | | V| 23+55 36.3710 5.10 Q | | | V| 24+ 0 36.4059 5.07 Q | | | V| 24+ 5 36.4403 4.99 Q | | | V| 24+10 36.4734 4.81 Q | | | V| 24+15 36.5046 4.52 Q | | | V| 24+20 36.5317 3.93 Q | | | V| 24+25 36.5530 3.10 Q | | | V| 24+30 36.5701 2.48 Q | | | V| 24+35 36.5842 2.05 Q | | | V| 24+40 36.5962 1.75 Q | | | V| 24+45 36.6066 1.51 Q | | | V| 24+50 36.6157 1.31 Q | | | V| 24+55 36.6236 1.15 Q | | | V| 25+ 0 36.6306 1.01 Q | | | V| 25+ 5 36.6368 0.90 Q | | | V| 25+10 36.6423 0.80 Q | | | V| 25+15 36.6471 0.71 Q | | | V| 25+20 36.6514 0.63 Q | | | V| 25+25 36.6553 0.56 Q | | | V| 25+30 36.6587 0.50 Q | | | V| 25+35 36.6618 0.45 Q | | | V| 25+40 36.6645 0.40 Q | | | V| 25+45 36.6670 0.35 Q | | | V| 25+50 36.6691 0.31 Q | | | V| 25+55 36.6711 0.28 Q | | | V| 26+ 0 36.6728 0.25 Q | | | V| 26+ 5 36.6743 0.22 Q | | | V| 26+10 36.6756 0.19 Q | | | V| 26+15 36.6767 0.17 Q | | | V|

26+20 36.6778 0.15 Q | | | V| 26+25 36.6787 0.13 Q | | | V| 26+30 36.6794 0.11 Q | | | V| 26+35 36.6801 0.10 Q | | | V| 26+40 36.6808 0.09 Q | | | V| 26+45 36.6814 0.08 Q | | | V| 26+50 36.6819 0.07 Q | | | V| 26+55 36.6823 0.06 Q | | | V| 27+ 0 36.6826 0.05 Q | | | V| 27+ 5 36.6829 0.04 Q | | | V| 27+10 36.6831 0.03 Q | | | V| 27+15 36.6832 0.02 Q | | | V| 27+20 36.6834 0.02 Q | | | V| 27+25 36.6834 0.01 Q | | | V| 27+30 36.6835 0.00 Q | | | V -----------------------------------------------------------------------

Appendix DOn-Site Rational Method Calculations

Pre-Development Condition

Area 1

Sub US DS Flow Length Area Soil Curve PercentArea To From Eleve Elev (feet) (Acres) Type Number Pervious1-A 101 102 3392 3383 392 1.1 A 23 100 Initial Area1-B 102 103 3383 3363 502 6.8 A 23 100 Irregular Channel-Add Area (Natural Chnl.)1-C 103 104 3363 3343 629 5.5 A 23 100 Irregular Channel-Add Area (Natural Chnl.)

Enter area-averaged point rainfall (inches)


1-Hour 1.203-Hour 1.736-Hour 2.21

24-Hour 4.08

RATIONAL METHOD SUMMARYAGINCOURT AREA 1 - PRE-DEVELOPMENT CONDITION


NodeComments


AREA 1-A Chaparral, Broadleaf (Fair) AMC 1 A 23.0 1.1 25.3 100.0%Chaparral, Broadleaf (Fair) AMC 1 D 64.4 0.0 0.0 0.0%



AREA 1-B Chaparral, Broadleaf (Fair) AMC 1 A 23.0 6.8 156.4 100.0%Chaparral, Broadleaf (Fair) AMC 1 D 64.4 0.0 0.0 0.0%



AREA 1-C Chaparral, Broadleaf (Fair) AMC 1 A 23.0 5.5 126.5 100.0%Chaparral, Broadleaf (Fair) AMC 1 D 64.4 0.0 0.0 0.0%



CURVE NUMBER AREA-AVERAGINGAGINCOURT AVERAGE CURVE NUMBER AREA-1 - PRE-DEVELOPMENT CONDITION


San Bernardino County Rational Hydrology Program

(Hydrology Manual Date - August 1986)

CIVILCADD/CIVILDESIGN Engineering Software, (c) 1989-2005 Version 7.1Rational Hydrology Study Date: 12/01/11

------------------------------------------------------------------------WDG SOLAR - AGINCOURTPRE-DEVELOPMENT CONDITION - ONSITE AREA100-YEAR RATIONAL METHOD, AREA 1BY: CRC------------------------------------------------------------------------


------------------------------------------------------------------------********* Hydrology Study Control Information **********

------------------------------------------------------------------------Rational hydrology study storm event year is 100.0Computed rainfall intensity:Storm year = 100.00 1 hour rainfall = 1.200 (In.)Slope used for rainfall intensity curve b = 0.7000Soil antecedent moisture condition (AMC) = 2

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++Process from Point/Station 101.000 to Point/Station 102.000**** INITIAL AREA EVALUATION ****______________________________________________________________________Soil classification AP and SCS values input by userUSER INPUT of soil data for subarea SCS curve number for soil(AMC 2) = 23.00Pervious ratio(Ap) = 1.0000 Max loss rate(Fm)= 1.000(In/Hr)Initial subarea data:Initial area flow distance = 392.000(Ft.)Top (of initial area) elevation = 3392.000(Ft.)Bottom (of initial area) elevation = 3383.000(Ft.)Difference in elevation = 9.000(Ft.)Slope = 0.02296 s(%)= 2.30TC = k(0.950)*[(length^3)/(elevation change)]^0.2Initial area time of concentration = 22.021 min.Rainfall intensity = 2.420(In/Hr) for a 100.0 year stormEffective runoff coefficient used for area (Q=KCIA) is C = 0.528Subarea runoff = 1.406(CFS)Total initial stream area = 1.100(Ac.)Pervious area fraction = 1.000Initial area Fm value = 1.000(In/Hr)

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++Process from Point/Station 102.000 to Point/Station 103.000**** IRREGULAR CHANNEL FLOW TRAVEL TIME ****______________________________________________________________________Estimated mean flow rate at midpoint of channel = 0.000(CFS)Depth of flow = 0.068(Ft.), Average velocity = 1.152(Ft/s)

******* Irregular Channel Data ***********-----------------------------------------------------------------Information entered for subchannel number 1 :Point number 'X' coordinate 'Y' coordinate

1 0.00 0.502 50.80 0.003 99.20 0.004 134.20 0.50

Manning's 'N' friction factor = 0.040-----------------------------------------------------------------Sub-Channel flow = 4.234(CFS) ' ' flow top width = 60.034(Ft.) ' ' velocity= 1.152(Ft/s)

' ' area = 3.676(Sq.Ft) ' ' Froude number = 0.820

Upstream point elevation = 3383.000(Ft.)Downstream point elevation = 3363.000(Ft.)Flow length = 502.000(Ft.)Travel time = 7.26 min.Time of concentration = 29.28 min.Depth of flow = 0.068(Ft.)Average velocity = 1.152(Ft/s)Total irregular channel flow = 4.234(CFS)Irregular channel normal depth above invert elev. = 0.068(Ft.)Average velocity of channel(s) = 1.152(Ft/s)Adding area flow to channelSoil classification AP and SCS values input by userUSER INPUT of soil data for subarea SCS curve number for soil(AMC 2) = 23.00Pervious ratio(Ap) = 1.0000 Max loss rate(Fm)= 1.000(In/Hr)Rainfall intensity = 1.983(In/Hr) for a 100.0 year stormEffective runoff coefficient used for area,(total area with modifiedrational method)(Q=KCIA) is C = 0.446Subarea runoff = 5.580(CFS) for 6.800(Ac.)Total runoff = 6.986(CFS)Effective area this stream = 7.90(Ac.)Total Study Area (Main Stream No. 1) = 7.90(Ac.)Area averaged Fm value = 1.000(In/Hr)Depth of flow = 0.091(Ft.), Average velocity = 1.372(Ft/s)



1 0.00 2.002 27.60 1.003 72.60 0.004 75.80 0.005 119.90 1.006 144.70 2.00

Manning's 'N' friction factor = 0.040-----------------------------------------------------------------Sub-Channel flow = 8.107(CFS) ' ' flow top width = 27.756(Ft.) ' ' velocity= 1.900(Ft/s) ' ' area = 4.266(Sq.Ft) ' ' Froude number = 0.854

Upstream point elevation = 3363.000(Ft.)Downstream point elevation = 3343.000(Ft.)Flow length = 629.000(Ft.)Travel time = 5.52 min.Time of concentration = 34.80 min.Depth of flow = 0.276(Ft.)Average velocity = 1.900(Ft/s)Total irregular channel flow = 8.107(CFS)Irregular channel normal depth above invert elev. = 0.276(Ft.)Average velocity of channel(s) = 1.900(Ft/s)Adding area flow to channelSoil classification AP and SCS values input by userUSER INPUT of soil data for subarea SCS curve number for soil(AMC 2) = 23.00Pervious ratio(Ap) = 1.0000 Max loss rate(Fm)= 1.000(In/Hr)Rainfall intensity = 1.757(In/Hr) for a 100.0 year stormEffective runoff coefficient used for area,(total area with modifiedrational method)(Q=KCIA) is C = 0.388

Subarea runoff = 2.143(CFS) for 5.500(Ac.)Total runoff = 9.129(CFS)Effective area this stream = 13.40(Ac.)Total Study Area (Main Stream No. 1) = 13.40(Ac.)Area averaged Fm value = 1.000(In/Hr)Depth of flow = 0.290(Ft.), Average velocity = 1.958(Ft/s)End of computations, Total Study Area = 13.40 (Ac.)The following figures maybe used for a unit hydrograph study of the same area.Note: These figures do not consider reduced effective areaeffects caused by confluences in the rational equation.

Area averaged pervious area fraction(Ap) = 1.000Area averaged SCS curve number = 23.0

Area 2




1-Hour 1.203-Hour 1.736-Hour 2.21

24-Hour 4.08



NodeComments











AGINCOURT AVERAGE CURVE NUMBER AREA-2 - PRE-DEVELOPMENT CONDITIONSAN BERNARDINO COUNTY

CURVE NUMBER AREA-AVERAGING











1 0.00 1.002 42.40 0.003 199.00 0.004 262.00 1.00






1 0.00 1.002 71.40 0.003 124.50 0.004 164.90 1.00


Upstream point elevation = 3373.000(Ft.)Downstream point elevation = 3350.000(Ft.)Flow length = 752.000(Ft.)Travel time = 9.28 min.Time of concentration = 42.99 min.Depth of flow = 0.104(Ft.)Average velocity = 1.351(Ft/s)Total irregular channel flow = 8.296(CFS)Irregular channel normal depth above invert elev. = 0.104(Ft.)Average velocity of channel(s) = 1.351(Ft/s)Adding area flow to channelSoil classification AP and SCS values input by userUSER INPUT of soil data for subarea SCS curve number for soil(AMC 2) = 23.00Pervious ratio(Ap) = 1.0000 Max loss rate(Fm)= 1.000(In/Hr)Rainfall intensity = 1.515(In/Hr) for a 100.0 year stormEffective runoff coefficient used for area,(total area with modifiedrational method)(Q=KCIA) is C = 0.306Subarea runoff = 8.180(CFS) for 20.800(Ac.)Total runoff = 12.337(CFS)

Effective area this stream = 26.60(Ac.)Total Study Area (Main Stream No. 1) = 26.60(Ac.)Area averaged Fm value = 1.000(In/Hr)Depth of flow = 0.131(Ft.), Average velocity = 1.555(Ft/s)End of computations, Total Study Area = 26.60 (Ac.)The following figures maybe used for a unit hydrograph study of the same area.Note: These figures do not consider reduced effective areaeffects caused by confluences in the rational equation.


Area 3




1-Hour 1.203-Hour 1.736-Hour 2.21

24-Hour 4.08

NodeComments













1 0.00 1.002 48.60 0.003 82.50 0.004 119.00 1.00






1 0.00 1.002 39.40 0.003 97.90 0.004 126.40 1.00



Area 4

Sub US DS Flow Length Area Soil Curve PercentArea To From Eleve Elev (feet) (Acres) Type Number Pervious4-A 401 402 3419 3409 250 0.8 A 23 100 Initial Area4-B 402 403 3409 3389 593 7.0 A 23 100 Irregular Channel-Add Area (Natural Chnl.)



1-Hour 1.203-Hour 1.736-Hour 2.21

24-Hour 4.08



NodeComments











1 0.00 1.002 74.20 0.003 84.80 0.004 137.20 1.00



Upstream point elevation = 3409.000(Ft.)Downstream point elevation = 3389.000(Ft.)Flow length = 593.000(Ft.)Travel time = 6.27 min.Time of concentration = 22.73 min.Depth of flow = 0.167(Ft.)Average velocity = 1.577(Ft/s)Total irregular channel flow = 5.554(CFS)Irregular channel normal depth above invert elev. = 0.167(Ft.)Average velocity of channel(s) = 1.577(Ft/s)Adding area flow to channelSoil classification AP and SCS values input by userUSER INPUT of soil data for subarea SCS curve number for soil(AMC 2) = 23.00Pervious ratio(Ap) = 1.0000 Max loss rate(Fm)= 1.000(In/Hr)Rainfall intensity = 2.367(In/Hr) for a 100.0 year stormEffective runoff coefficient used for area,(total area with modifiedrational method)(Q=KCIA) is C = 0.520Subarea runoff = 8.183(CFS) for 7.000(Ac.)Total runoff = 9.599(CFS)Effective area this stream = 7.80(Ac.)Total Study Area (Main Stream No. 1) = 7.80(Ac.)Area averaged Fm value = 1.000(In/Hr)Depth of flow = 0.216(Ft.), Average velocity = 1.825(Ft/s)End of computations, Total Study Area = 7.80 (Ac.)The following figures maybe used for a unit hydrograph study of the same area.Note: These figures do not consider reduced effective areaeffects caused by confluences in the rational equation.


Area 5




1-Hour 1.213-Hour 1.746-Hour 2.22

24-Hour 4.09



NodeComments











1 0.00 0.502 40.00 0.003 48.00 0.004 139.50 0.50






1 0.00 0.502 67.10 0.003 98.10 0.004 156.60 0.50



Area 6

Sub US DS Flow Length Area Soil Curve PercentArea To From Eleve Elev (feet) (Acres) Type Number Pervious6-A 601 602 3428 3422 228 0.9 D 64.4 100 Initial Area6-B 602 603 3422 3406 477 5.8 A,D 35.8 100 Irregular Channel-Add Area (Natural Chnl.)



1-Hour 1.213-Hour 1.746-Hour 2.22

24-Hour 4.09



NodeComments











1 0.00 0.502 40.50 0.003 92.70 0.004 130.40 0.50


Appendix EOn-Site Rational Method Calculations

Post-Development Condition

Area 1

Sub US DS Flow Length Area Soil Curve Imp. Area PercentArea To From Eleve Elev (feet) (Acres) Type Number (Acres) Pervious1-A 101 102 3392 3383 392 1.1 A 60.6 0 100 Initial Area1-B 102 103 3383 3363 502 6.8 A 60.6 0.91 86.6 Irregular Channel-Add Area (Natural Chnl.)1-C 103 104 3363 3343 629 5.5 A 60.6 0.59 89.3 Irregular Channel-Add Area (Natural Chnl.)



1-Hour 1.203-Hour 1.736-Hour 2.21

24-Hour 4.08

RATIONAL METHOD SUMMARYAGINCOURT AREA 1 POST-DEVELOPMENT CONDITION


NodeComments


AREA 1-A Barren AMC 1 A 60.6 1.1 66.7 100.0%Barren AMC 1 D 83.4 0.0 0.0 0.0%



AREA 1-B Barren AMC 1 A 60.6 6.8 412.1 100.0%Barren AMC 1 D 83.4 0.0 0.0 0.0%



AREA 1-C Barren AMC 1 A 60.6 5.5 333.3 100.0%Barren AMC 1 D 83.4 0.0 0.0 0.0%



CURVE NUMBER AREA-AVERAGINGAGINCOURT AVERAGE CURVE NUMBER AREA 1 - POST-DEVELOPMENT CONDITION


ESTIMATE ESTIMATEDDESCRIPTION AREA

AREA 1-A Piles 480 ft2

Compacted Dirt Road 6678.6 ft2

TOTAL IMPERVIOUS AREA= 0.16 ACRES

AREA 1-B Piles 2948 ft2



AREA 1-C Piles 2391 ft2



IMPERVIOUS AREA ESTIMATEAGINCOURT ON-SITE POST-DEVELOPMENT CONDITION AREA 1





------------------------------------------------------------------------WDG SOLAR - AGINCOURTPOST-DEVELOPMENT CONDITION - ONSITE AREA100-YEAR RATIONAL METHOD, AREA 1BY: CRC------------------------------------------------------------------------







1 0.00 0.502 50.80 0.003 99.20 0.004 134.20 0.50






1 0.00 2.002 27.60 1.003 72.60 0.004 75.80 0.005 119.90 1.006 144.70 2.00


Upstream point elevation = 3363.000(Ft.)Downstream point elevation = 3343.000(Ft.)Flow length = 629.000(Ft.)Travel time = 4.89 min.Time of concentration = 31.93 min.Depth of flow = 0.336(Ft.)Average velocity = 2.143(Ft/s)Total irregular channel flow = 13.047(CFS)Irregular channel normal depth above invert elev. = 0.336(Ft.)Average velocity of channel(s) = 2.143(Ft/s)Adding area flow to channelSoil classification AP and SCS values input by userUSER INPUT of soil data for subarea SCS curve number for soil(AMC 2) = 60.60Pervious ratio(Ap) = 0.8930 Max loss rate(Fm)= 0.600(In/Hr)Rainfall intensity = 1.866(In/Hr) for a 100.0 year stormEffective runoff coefficient used for area,(total area with modifiedrational method)(Q=KCIA) is C = 0.612

Subarea runoff = 4.631(CFS) for 5.500(Ac.)Total runoff = 15.314(CFS)Effective area this stream = 13.40(Ac.)Total Study Area (Main Stream No. 1) = 13.40(Ac.)Area averaged Fm value = 0.596(In/Hr)Depth of flow = 0.358(Ft.), Average velocity = 2.231(Ft/s)End of computations, Total Study Area = 13.40 (Ac.)The following figures maybe used for a unit hydrograph study of the same area.Note: These figures do not consider reduced effective areaeffects caused by confluences in the rational equation.


Area 2




1-Hour 1.203-Hour 1.736-Hour 2.21

24-Hour 4.08



NodeComments











AGINCOURT AVERAGE CURVE NUMBER AREA 2 - POST-DEVELOPMENT CONDITIONSAN BERNARDINO COUNTY

CURVE NUMBER AREA-AVERAGING











1 0.00 1.002 42.40 0.003 199.00 0.004 262.00 1.00






1 0.00 1.002 71.40 0.003 124.50 0.004 164.90 1.00



Area 3




1-Hour 1.203-Hour 1.736-Hour 2.21

24-Hour 4.08

NodeComments













1 0.00 1.002 48.60 0.003 82.50 0.004 119.00 1.00






1 0.00 1.002 39.40 0.003 97.90 0.004 126.40 1.00



Area 4

Sub US DS Flow Length Area Soil Curve Imp. Area PercentArea To From Eleve Elev (feet) (Acres) Type Number (Acres) Pervious4-A 401 402 3419 3409 250 0.8 A 60.6 0.0 100 Initial Area4-B 402 403 3409 3389 593 7.0 A 60.6 0.73 89.6 Irregular Channel-Add Area (Natural Chnl.)



1-Hour 1.203-Hour 1.736-Hour 2.21

24-Hour 4.08



NodeComments











1 0.00 1.002 74.20 0.003 84.80 0.004 137.20 1.00


Area 5




1-Hour 1.213-Hour 1.746-Hour 2.22

24-Hour 4.09



NodeComments











1 0.00 0.502 40.00 0.003 48.00 0.004 139.50 0.50






1 0.00 0.502 67.10 0.003 98.10 0.004 156.60 0.50



Area 6

Sub US DS Flow Length Area Soil Curve Imp. Area PercentArea To From Eleve Elev (feet) (Acres) Type Number (Acres) Pervious6-A 601 602 3428 3422 228 0.9 D 83.4 0.0 100 Initial Area6-B 602 603 3422 3406 477 5.8 A,D 67.7 1.3 77.9 Irregular Channel-Add Area (Natural Chnl.)



1-Hour 1.213-Hour 1.746-Hour 2.22

24-Hour 4.09

RATIONAL METHOD SUMMARYAGINCOURT AREA 6 - POST-DEVELOPMENT CONDITION


NodeComments






Switchgear 10000 ft2















1 0.00 0.502 40.50 0.003 92.70 0.004 130.40 0.50


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