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Open-File Report 82-560

MONTHLY LOW-FLOW CHARACTERISTICS OF GEORGIA STREAMS

Prepared In cooperation with the GEORGIA DEPARTMENT OF NATURAL RESOURCES Environmental Protection Division

R.F. Carter and J.D. Fanning

ABSTRACT

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Statistics of monthly minimum flows are presented for 129 streamflow stations. Low-flow frequency data provided are based on graphical or log-Pearson Type III distributions. The probable magnltude of average standard errors due to time-sampling biss is tabulated. The average standard errors were found to be similar over a wide area comprising approximately the northern two-thirds of the State. In this area, the average standard error of estimate for a low-flow statistic. with a recurrence interval of 20 years and estimated on the basis of 10 years of record, is about 17 percent. In the southern third of the State, the magnitudes of these errors were also found to be within a narrow range, but significantly greater than in the north. In this southern area, the average standard error of estimate for a low-flow statistic. with a recurrence interval of 20 years and estimated on the basis of 10 years of record, is about 40 percent.

First posted January 5, 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 acknowledgements

Developmen t of frequency statistics

Computation of average minimum flows

Frequency computations

Effect of length of record

Applications of monthly low-flow frequency data

Availability of information

Ungaged streams

Accuracy

Time-sampling error

Space-sampling error

Comparison of monthly and annual low-flow frequency statistics

Presentation of low-flow characteristics of streams

Selected refernces


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