USGS Scientific Investigations Report 2007-5204

Prepared in cooperation with the Alabama Department of Transportation

Magnitude and Frequency of Floods in Alabama, 2003

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 (Opens the PDF file in a new window. ) (8.8 MB)
Plate 1 (Opens the PDF file in a new window. ): Locations of flood regions and gaging stations in Alabama (1.2 MB)

Cover thumbnailMethods 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).

 

CONTENTS

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 20075204, 28 p., + app. (available online at http://pubs.water.usgs.gov/sir2007-5204)

For more information, please contact T.S. Hedgecock.

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