1. 2008 FLOODS IN ARKANSAS 2008 FLOODS IN ARKANSAS August 13 – 14, 2009 Jaysson Funkhouser jefunkho@usgs.gov http://ar.water.usgs.gov 501-228-3663 SEVERE STORMS / RADAR AND HYDROLOGY CONFERENCE August 13 – 14, 2009 Jaysson Funkhouser jefunkho@usgs.gov http://ar.water.usgs.gov 501-228-3663 U.S. Department of the Interior U.S. Geological Survey

2. Objectives  Streamgaging program in Arkansas  2008 floods in Arkansas  Exceedence Calculations and Frequency Curve Changes for Select Streams  Rating Curve Changes

3. Streamgaging Program in Arkansas  First USGS streamgage in Arkansas was installed in 1903  150 streamgages in Arkansas (8/01/09) Ouachita River near Malvern

4.  6 State agencies (23%)  7 Municipalities, 4 Water utility companies (11%)  7 Federal agencies (36%)  7 private agencies (~ 2%)  $2.5 million in FY 2009 Streamgaging Program in Arkansas

5. 2008 Floods In Arkansas

6. http://water.usgs.gov/waterwatch/ar

7. 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

9. 07056000 Buffalo River nr St. Joe March 18, 2008 (49.4’) 134,000 cfs 4 % – 2 % flood December 3, 1982 (53.75’) 158,000 cfs 1 % flood without 2008 peak

11. 07057370 White River nr Norfork March 19, 2008 (39.8’) 196,000 cfs 6 years of peak data available

13. 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

15. 07060500 White River at Calico Rock MARCH 19, 2008; DISCHARGE = 196,000; STAGE = 39.50

17. 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

19. 2008 and 1982 Stage Level Q old rating = 330,000 cfs Q new rating = 257,000 cfs Rating Curve Changes

20. April 25, 2004 measurements April 11, 2008 measurements

21. Rating Curve Changes