2008 FLOODS IN ARKANSAS2008 FLOODS IN ARKANSAS
SEVERE STORMS / RADAR AND HYDROLOGY CONFERENCE
August 13 – 14, 2009August 13 – 14, 2009Jaysson FunkhouserJaysson [email protected]@usgs.gov
http://ar.water.usgs.govhttp://ar.water.usgs.gov501-228-3663501-228-3663
U.S. Department of the InteriorU.S. Department of the InteriorU.S. Geological SurveyU.S. Geological Survey
ObjectivesObjectives Streamgaging program in ArkansasStreamgaging program in Arkansas 2008 floods in Arkansas2008 floods in Arkansas Exceedence Calculations and Frequency Exceedence Calculations and Frequency
Curve Changes for Select StreamsCurve Changes for Select Streams Rating Curve Changes Rating Curve Changes
Streamgaging Program in ArkansasStreamgaging Program in Arkansas
First USGS First USGS streamgage in streamgage in Arkansas was Arkansas was installed in 1903installed in 1903
150 streamgages in 150 streamgages in Arkansas (8/01/09)Arkansas (8/01/09)
Ouachita River near MalvernOuachita River near Malvern
6 State agencies (23%)6 State agencies (23%) 7 Municipalities, 4 Water 7 Municipalities, 4 Water
utility companies (11%)utility companies (11%) 7 Federal agencies (36%)7 Federal agencies (36%) 7 private agencies (~ 2%)7 private agencies (~ 2%) $2.5 million in FY 2009$2.5 million in FY 2009
23%
11%
37%
29%
State
Municipalities
Federal
USGS
Streamgaging Program in Streamgaging Program in ArkansasArkansas
2008 Floods In Arkansas
http://water.usgs.gov/waterwatch/arhttp://water.usgs.gov/waterwatch/ar
All exceedence calculations were made possible through a joint-funding effort between
the Little Rock and Memphis USACE and the
USGS
2008 Floods In Arkansas
http://pubs.usgs.gov/fs/2008/3103/pdf/FactSheet.pdf
07056000 BUFFALO RIVER NR ST. JOE
RANK0 10 20 30 40 50 60 70
DIS
CH
AR
GE
, IN
CU
BIC
FE
ET
PE
R S
EC
ON
D
0
20000
40000
60000
80000
100000
120000
140000
160000
180000DECEMBER 1982
AUGUST 1915
MARCH 2008
07056000 Buffalo River nr St. JoeMarch 18, 2008 (49.4’)
134,000 cfs
4 % – 2 % flood
December 3, 1982 (53.75’)
158,000 cfs
1 % flood without 2008 peak
07056000 BUFFALO RIVER NEAR ST. JOE
PERCENT EXCEEDENCE0.00 0.01 0.02 0.03 0.04 0.05D
ISC
HA
RG
E, I
N C
UB
IC F
EE
T P
ER
SE
CO
ND
60000
80000
100000
120000
140000
160000
180000
200000
220000
240000
FREQUENCY CURVE WITHOUT 2008 PEAK FREQUENCY CURVE WITH 2008 PEAK
07057370 White River nr NorforkMarch 19, 2008 (39.8’)
196,000 cfs
6 years of peak data available
07060500 WHITE RIVER AT CALICO ROCK(POST REGULATION)
RANK10 20 30 40D
ISC
HA
RG
E, I
N C
UB
IC F
EE
T P
ER
SE
CO
ND
0
50000
100000
150000
200000
250000
DECEMBER 1982
APRIL 2008
07060500 White River at Calico Rock April 11, 2008 (40.27’)
202,000 cfs
4 % – 2 % flood
December 4, 1982 (41.14’)
201,000 cfs
1 % flood without 2008 peak
07060500 WHITE RIVER AT CALICO ROCK
PERCENT EXCEEDENCE0.00 0.01 0.02 0.03 0.04 0.05
DIS
CH
AR
GE
, IN
CU
BIC
FE
ET
PE
R S
EC
ON
D
100000
150000
200000
250000
300000
350000
FREQUENCY CURVE WITHOUT 2008 PEAK FREQUENCY CURVE WITH 2008 PEAK
07060500 White River at Calico Rock
MARCH 19, 2008; DISCHARGE = 196,000; STAGE = 39.50
07074500 WHITE RIVER AT NEWPORT
RANK10 20 30 40
DIS
CH
AR
GE
, IN
CU
BIC
FE
ET
PE
R S
EC
ON
D
0
50000
100000
150000
200000
250000
300000
350000
DECEMBER 1982
MARCH 2008
07074500 White River at Newport March 21, 2008 (33.87’)
266,000 cfs
4 % – 2 % flood
December 5, 1982 (34.00’)
330,000 cfs
1 – 0.5 % flood without 2008 peak
07074500 WHITE RIVER AT NEWPORT
PERCENT EXCEEDENCE0.00 0.01 0.02 0.03 0.04 0.05D
ISC
HA
RG
E, I
N C
UB
IC F
EE
T P
ER
SE
CO
ND
100000
200000
300000
400000
500000
600000
Frequency Curve Without 2008 PeakFrequency Curve With 2008 Peak
07074500 WHITE RIVER AT NEWPORT
DISCHARGE, IN CUBIC FEET PER SECOND1000 10000 100000 1000000
STA
GE
, IN
FE
ET
0
10
20
30
40
Discharge measurements prior to 1985Discharge measurements after 1985
2008 and 1982 Stage Level
Qold rating = 330,000 cfs
Qnew rating = 257,000 cfs
Rating Curve Changes
Rating Curve Changes07057370 WHITE RIVER NEAR NORFORK
DISCHARGE, IN CUBIC FEET PER SECOND100 1000 10000 100000 1000000
STA
GE
, IN
FE
ET
1
10
100
April 25, 2004 measurements
April 11, 2008 measurements
Rating Curve Changes
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