Georgia Water Science Center

USGS Open-File Report 96-596

VERIFICATION OF THE REGION 3 URBAN FLOOD-FREQUENCY EQUATIONS FOR TIFTON, GEORGIA

This report is available online in pdf format (0.3 MB): USGS OFR 96-596 (Opens the PDF file in a new window. )

Ernest J. Inman

U.S. Geological Survey Open-File Report 96-596, 9 pages (Published 1996)

ABSTRACT

A U.S. Geological Survey rainfall-runoff model was calibrated for four urban drainage basins ranging in size from 0.16 to 0.71 square mile in Tifton, Ga. Rainfall-runoff data were collected over a period of about five years at each station, beginning in April 1991 and ending in July 1996. Calibrated models were used to synthesize long-term annual flood-peak discharges from existing long-term rainfall records for these basins. The 2-, 5-, 10-, 25-, 50-, 100-, 200-, and 500-year flood-frequency estimates were developed for each basin by fitting a Pearson Type III frequency distribution curve to the logarithms of these annual peak discharges.

The 2- through 500-year flood-frequency estimates from the four Tifton stations were compared to the 2- through 500-year flood-frequency estimates computed from the equations presented in a statewide urban flood-frequency report in 1995. All floods, except the 2-year flood at one site, were within the average standard error of prediction; thereby, verifying the urban flood-frequency equations for use in the Tifton area.


CONTENTS

Abstract

Introduction

Purpose and scope

Site selection

Data collection and processing

Current data

Long-term rainfall and daily pan-evaporation data

Flood-frequency relations

Description of rainfall-runoff model

Flood-frequency analysis

Regional regression analysis

Standard error of prediction

Use of flood-frequency relations

Summary and conclusion

References cited

 


REPORT AVAILABILITY

This report is available online in pdf format (0.3 MB): USGS OFR 96-596 (Opens the PDF file in a new window. )
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