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Open-File Report 2010–1230

Historic Flooding in Georgia, 2009

Anthony J. Gotvald

Summary

Thumbnail of and link to report PDF (6 MB)

Heavy rains in southern Georgia during March 27–April 3, 2009, and in northern Georgia during September 16–22, 2009, caused severe flooding and widespread damages to residential, public, and commercial structures. Of the 159 counties in Georgia, 69 were declared disaster areas because of flooding. The heavy rainfall in southern Georgia resulted in severe flooding in the Satilla–St. Marys and upper Ochlockonee Basins and caused approximately $60 million in damages to the public infrastructure. The heavy rainfall in northern Georgia resulted in severe flooding on many streams within the upper Chattahoochee, Altamaha, and Coosa–Tallapoosa Basins and caused 10 deaths, evacuation of thousands of residents, and approximately $500 million in damages.

The U.S. Geological Survey computed annual exceedance probabilities of the peak flows in 2009 at 238 streamgages throughout the State. Record peak flows were recorded at 40 streamgages for the respective periods of record as a result of the heavy rainfall during the two multiday events. The peak flows at 33 streamgages exceeded the 1-percent annual exceedance probability (100-year recurrence interval), and 19 of these exceeded the 0.2-percent annual exceedance probability (500-year recurrence interval).

First posted September 29, 2010

For additional information contact:
Director, Georgia Water Science Center
U.S. Geological Survey
3039 Amwiler Rd.
Suite 130
30360-2824
http://ga.water.usgs.gov/

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Suggested citation:

Gotvald, A.J., 2010, Historic flooding in Georgia, 2009: U.S. Geological Survey Open-File Report 2010-1230, 19 p.


Contents

Abstract

Introduction

Purpose and Scope

Abstract

Introduction

Purpose and Scope

Description of Storms Associated with the Floods

Description of the Floods

Flood Stages and Streamflows

Annual Exceedance Probabilities

Summary

Acknowledgments

References Cited


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