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Open-File Report 77–127

Low-Flow Frequency of Georgia Streams

R. F. Carter and S. A. Putnam

Abstract

Cover of the report.

This report contains analyses of low-flow data and tabulations of computed low-flow frequency for all stream sites in Georgia where suitable flow records have been collected. These include 134 continuous-record gaging stations and 102 partial-record gaging stations. Frequency records for gaging stations with short records have been adjusted where possible to more closely represent results that would have been obtained from longer records.

Variations in time and place of low-flow characteristics, per unit of drainage area, are demonstrated. Low flows for 7 consecutive days with a 10-year recurrence interval vary from 0 to more than 1.0 cubic feet per second per square mile [(ft3/s)/mi2)]. In the Blue Ridge province in the northern part of the State, unit low flows range from 0.3 to 0.8 (ft3/s)/mi2; in the Valley and Ridge province in the northwest they range from 0.05 to 0.4 (ft3/s)/mi2; and in the Piedmont province they range from 0.1 to 1.1 (ft3/s)/mi2.

There is a contrast in unit rates of low flow between the upper zone of the Coastal Plain where most flows are high, and the lower zone where most flows are low. Flows in the upper zone are in the range of 0.1 to 1.1 (ft3/s)/mi2, but in the lower zone only the largest streams have appreciable flow during low-flow periods.

First posted December 7, 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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Contents

Abstract

Introduction

Purpose and scope

Cooperation and acknowledgments

Data compilation and analysis

Methods

Computation of average minimum flows

Continuous-record gaging stations

Partial-record gaging stations

Regional characteristics

Physiographic provinces

Flow per square mile of drainage area

Relationship to geology

Applications of low-flow frequency data

Availability of information

Interpolation and extrapolation

Ungaged streams

Presentation of low-flow characteristics of streams

Supplementary data

Selected references



Suggested citation:

Carter, R.F., and Putnam, S.A., 1978, Low-flow frequency of Georgia streams: U.S. Geological Survey Open-File Report 77–127, 104 p.

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