Floods in Central Texas, September 7–14, 2010
Vol. 3 No. 1 (2012). Cover photo: Located in far east Texas and stretching into Louisiana, Caddo Lake is known for its extensive forests of bald cypress trees draped with Spanish moss. Photo credit: Texas Water Resources Institute.


annual exceedance probability

How to Cite

Winters, Karl E. 2012. “Floods in Central Texas, September 7–14, 2010”. Texas Water Journal 3 (1). College Station, Texas:14-25. https://doi.org/10.21423/twj.v3i1.3292.


Severe flooding occurred near the Austin metropolitan area in central Texas September 7–14, 2010, because of heavy rainfall associated with Tropical Storm Hermine. The U.S. Geological Survey, in cooperation with the Upper Brushy Creek Water Control and Improvement District, determined rainfall amounts and annual exceedance probabilities for rainfall resulting in flooding in Bell, Williamson, and Travis counties in central Texas during September 2010. We documented peak streamflows and the annual exceedance probabilities for peak streamflows recorded at several streamflow-gaging stations in the study area. The 24-hour rainfall total exceeded 12 inches at some locations, with one report of 14.57 inches at Lake Georgetown. Rainfall probabilities were estimated using previously published depth-duration frequency maps for Texas. At 4 sites in Williamson County, the 24-hour rainfall had an annual exceedance probability of 0.002. Streamflow measurement data and flood-peak data from U.S. Geological Survey surface-water monitoring stations (streamflow and reservoir gaging stations) are presented, along with a comparison of September 2010 flood peaks to previous known maximums in the periods of record. Annual exceedance probabilities for peak streamflow were computed for 20 streamflow-gaging stations based on an analysis of streamflow-gaging station records. The annual exceedance probability was 0.03 for the September 2010 peak streamflow at the Geological Survey’s streamflow-gaging stations 08104700 North Fork San Gabriel River near Georgetown, Texas, and 08154700 Bull Creek at Loop 360 near Austin, Texas. The annual exceedance probability was 0.02 for the peak streamflow for Geological Survey´s streamflow-gaging station 08104500 Little River near Little River, Texas. The lack of similarity in the annual exceedance probabilities computed for precipitation and streamflow might be attributed to the small areal extent of the heaviest rainfall over these and the other gaged watersheds.

Citation: Winters KE. 2012. Floods in Central Texas, September 7–14, 2010. Texas Water Journal. 3(1):14-25. Available from: https://doi.org/10.21423/twj.v3i1.3292.



Asquith WH, Roussel MC. 2004. Atlas of depth-duration frequency of precipitation annual maxima for Texas. Austin (Texas): U.S. Geological Survey. Scientific Investigations Report 2004-5041. (TxDOT Implementation Report 5–1301–01–1). 106 p.

Asquith WH, Roussel MC. 2009. Regression equations for estimation of annual peak-streamflow frequency for undeveloped watersheds in Texas using an L-moment-based, PRESS-minimized, residual-adjusted approach. Austin (Texas): U.S. Geological Survey. Scientific Investigations Report 2009-5087. (Texas Department of Transportation Research Report 0–5521–1). 48 p.

Asquith WH, Slade RM Jr. 1995. Documented and potential extreme peak discharges and relation between potential extreme peak discharges and probable maximum flood peak discharges in Texas. Austin (Texas): U.S. Geological Survey; in cooperation with Texas Department of Transportation. Water-Resources Investigations Report 95–4249. 58 p.

Associated Press. 2010 September 14. Hermine death toll at 8 after 2 more bodies found. Austin American-Statesman [Internet]. [cited 2011 April 29]. Available from: http://www.statesman.com/news/nation/hermine-death-toll-at-8-after-2-more-916411.html

Austin American-Statesman. 2010 September 13. Austin police—Deceased person found in Lake Austin. Austin American-Statesman [Internet]. [cited 2012 January 9]. Blotter. Available from: http://www.statesman.com/blogs/content/shared-gen/blogs/austin/blotter/entries/2010/09/13/austin_police_are_on_the_scene.html

Costa JE, Jarrett RD. 2008. An evaluation of selected extraordinary floods in the United States reported by the U.S. Geological Survey and implications for future advancement of flood science. Reston (Virginia): U.S. Geological Survey. Scientific Investigations Report 2008–5164. 232 p.

Dalrymple T, Benson MA. 1967. Measurement of peak discharge by the slope-area method. Denver (Colorado): U.S. Geological Survey. Techniques of Water-Resources Investigations, Book 3, Chap. A2. 12 p.

[FAA] Federal Aviation Administration. 2012. Surface Weather Observation Stations in Texas—Georgetown and Lago Vista [Internet]. Washington (District of Columbia): Federal Aviation Administration [cited 2012 January 12]. Available from: http://www.faa.gov/air_traffic/weather/asos/?state=TX

Flynn KM, Kirby WH, Mason R, Cohn TA. 2006. Estimating the magnitude and frequency of floods using the PeakFQ program. Reston (Virginia): U.S. Geological Survey. Fact Sheet FS–2006–3143. 2 p.

Fontaine RA, Hill BR. 2002. Streamflow and erosion response to prolonged intense rainfall of November 1–2, 2000, Island of Hawaii, Hawaii. Honolulu (Hawaii): U.S. Geological Survey. Water-Resources Investigations Report 02-4117. 31 p.

Fulford JM. 1994. User’s guide to SAC, a computer program for computing discharge by slope-area method. Stennis Space Center (Mississippi): U.S. Geological Survey Earth Science Information Center. Report No: 94–360. 31 p.

Holmes RR Jr, Dinicola K. 2010. 100-Year flood—It’s all about chance. Reston (Virginia): U.S. Geological Survey. General Information Product 106. 1 p.

Interagency Advisory Committee on Water Data. 1982. Guidelines for determining flood flow frequency. Bulletin 17B of the Hydrology Subcommittee. Reston (Virginia): U.S. Geological Survey Office of Water Data Coordination. 183 p.

Jain SK, Singh VP. 2005. Isohyetal Method. In: Lehr JH, Keeley J, editors. Water Encyclopedia: [Internet]. Hoboken (New Jersey): John Wiley & Sons, Inc.; [cited 2012 January 9]. Available from: http://onlinelibrary.wiley.com/doi/10.1002/047147844X.me231/full

Kennedy EJ. 1983. Computation of continuous records of streamflow. Denver (Colorado): U.S. Geological Survey. Techniques of Water-Resources Investigations, Book 3, Chapter A13, 53 p.

[NWS] National Weather Service. 2010. Advanced hydrologic prediction service [Internet]. Silver Spring (Maryland): National Weather Service; [modified 2011 October 19; cited 2011 April 15]. Available from: http://water.weather.gov/precip/

Rantz SE and others. 1982. Measurement and computation of streamflow—Volume 1. Measurement of stage and discharge, and Volume 2. Computation of discharge [Internet]. Washington (District of Columbia): U.S. Geological Survey; [cited 2011 June 21]. Water Supply Paper 2175. 631 p. Available from: http://pubs.usgs.gov/wsp/wsp2175/

Rasmussen B. 2010 Sep 8. Flooding destroys homes along Lake Creek. Community Impact Newspaper [Internet]. [cited 2011 April 29]. Available from: http://impactnews.com/articles/flooding-destroys-homes-along-lake-creek/

Rowe TG, Allander KK. 2000. Surface- and ground-water characteristics in the upper Truckee River and Trout Creek watersheds, South Lake Tahoe, California and Nevada, July-December 1996. Carson City (Nevada): U.S. Geological Survey; in cooperation with Tahoe Regional Planning Agency. Water-Resources Investigations Report 00-4001.

Turnipseed DP, Sauer VB. 2010. Discharge measurements at gaging stations. Reston (Virginia): U.S. Geological Survey. Techniques and Methods, Book 3, Chapter A8, 87 p.

[USACE] U.S. Army Corps of Engineers. 2011. Fort Worth District—Reservoir control section [Internet]. Fort Worth (Texas): U.S. Army Corps of Engineers [cited 2011May 3]. Available from: http://www.swf-wc.usace.army.mil/cgi-bin/rcshtml.pl

[USGS] U.S. Geological Survey. 2010. Water-resources data for the United States, water year 2010 [Internet]. Reston (Virginia):U.S. Geological Survey [cited 2012 January 16]. Report No.: WDR–US–2010. Available from: http://wdr.water.usgs.gov/wy2010/search.jsp

[USGS] U.S. Geological Survey. 2012. National Water Information System: Web Interface. USGS Water data for Texas [Internet]. Reston (Virginia): U.S. Geological Survey [cited 2012 January 12]. Available from: http://waterdata.usgs.gov/tx/nwis/

[UBCWCID] Upper Brushy Creek Water Control and Improvement District [Internet]. 2012. Available from: http://www.upperbrushycreekwcid.org/

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Copyright (c) 2012 Karl E. Winters