USGS Scientific Investigations Report 2007-5204
Prepared in cooperation with the Alabama Department of Transportation
By T.S. Hedgecock and Toby D. Feaster
U.S. Geological Survey Scientific Investigations Report 2007-5204, 28 pages plus appendix (Published online, February 2008)
This report is available in PDF format:
SIR 2007-5204 (
) (8.8 MB)
Plate 1 (): Locations of flood regions and gaging stations in Alabama (1.2 MB)
Methods of estimating flood magnitudes for recurrence intervals of 1.5, 2, 5, 10, 25, 50, 100, 200, and 500 years have been developed for rural streams in Alabama that are not affected by regulation or urbanization. Regression relations were developed using generalized least-squares regression techniques to estimate flood magnitude and frequency on ungaged streams as a function of the basin drainage area. These methods are based on flood-frequency characteristics for 169 gaging stations in Alabama and 47 gaging stations in adjacent states having 10 or more years of record through September 2003. Graphical relations of peak flows to drainage areas are presented for sites along the Alabama, Coosa, Tallapoosa, Tennessee, Tombigbee, and Black Warrior Rivers. Equations that account for drainage area and percentage of impervious cover as independent variables also are provided for estimating flood magnitudes on ungaged urban streams (taken from a previous report).
Abstract
Introduction
Purpose and Scope
Previous Studies
Description of the Study Area
Flood Data Used in the Analysis
Flood Magnitude and Frequency at Gaging Stations
Regional Flood-Frequency Analysis
Accuracy and Limitations of Flood-Frequency Estimates
Use of Flood-Frequency Relations
Gaged Sites
Ungaged Sites
Sites on Streams that Cross Flood Region or State Boundaries
Flood-Frequency Analysis for Large Streams
Alabama River
Coosa River
Tallapoosa River
Tennessee River
Tombigbee River
Mobile River
Black Warrior River
Flood Magnitude and Frequency for Urban Streams
Summary
References Cited
Appendix: Supplemental data for gaging stations in Alabama
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Suggested citation: Hedgecock, T.S., and Feaster, T.D., 2007, Magnitude and frequency of floods in Alabama, 2003: U.S. Geological Survey Scientific Investigations Report 2007–5204, 28 p., + app. (available online at https://pubs.water.usgs.gov/sir2007-5204)
For more information, please contact T.S. Hedgecock.
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