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Fact Sheet 2011–3082

Prepared in cooperation with the Texas Department of Transportation

Annual Peak Streamflow and Ancillary Data for Small Watersheds in Central and Western Texas

By Glenn R. Harwell and William H. Asquith

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Estimates of annual peak-streamflow frequency are needed for flood-plain management, assessment of flood risk, and design of structures, such as roads, bridges, culverts, dams, and levees. Regional regression equations have been developed and are used extensively to estimate annual peak-streamflow frequency for ungaged sites in natural (unregulated and rural or nonurbanized) watersheds in Texas. The most recent regional regression equations were developed by using data from 638 Texas streamflow-gaging stations throughout the State with eight or more years of data by using drainage area, channel slope, and mean annual precipitation as predictor variables. However, because of a lack of sufficient historical streamflow data from small, rural watersheds in certain parts of the State (central and western), substantial uncertainity exists when using the regional regression equations for the purpose of estimating annual peak-streamflow frequency.

First posted August 9, 2011

For additional information contact:
Director, Texas Water Science Center
U.S. Geological Survey
1505 Ferguson Lane
Austin, Texas 78754-4501
http://tx.usgs.gov/

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Suggested citation:

Harwell, G.R., and Asquith, W.H., 2011, Annual peak streamflow and ancillary data for small watersheds in central and western Texas: U.S. Geological Survey Fact Sheet 2011–3082, 4 p.



Contents

Background

Estimating Peak Streamflow in Central and Western Texas

Estimating Discharge from Culvert Hydraulics

Selected References


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