USGS

 

Techniques for Estimating Peak-Flow Magnitude and Frequency Relations for South Dakota Streams

U.S. Geological Survey
Water-Resources Investigations Report 98-4055

 

by Steven K. Sando

 

The full report is available in pdf. Links to the pdf.


Abstract

A generalized skew coefficient analysis was completed for South Dakota to test the validity of using the generalized skew coefficient map in Bulletin 17B of the 1982 United States Water Resources Council, “Guidelines for Determining Flood Flow Frequency.” Results of the analysis indicate that the Bulletin 17B generalized skew coefficient map generally provides adequate generalized skew coefficients for estimating peakflow magnitudes and frequencies for South Dakota gaging stations.

Peak-flow records through 1994 for 197 continuous- and partial-record streamflow-gaging stations that had 10 or more years of unregulated systematic record were used in a generalized leastsquares regression analysis that relates peak flows for selected recurrence intervals to selected basin characteristics. Peak-flow equations were developed for recurrence intervals of 2, 5, 10, 25, 50, 100, and 500 years for seven hydrologic subregions in South Dakota. The peak-flow equations are applicable to natural-flow streams that have drainage areas less than or equal to 1,000 square miles. The standard error of estimate for the seven hydrologic subregions ranges from 22 to 110 percent for the 100-year peak-flow equations.

Weighted peak flows for various frequencies based on gaging-station data and the regional regression equations are provided for each gaging station. Examples are given for (1) determining peak-flow magnitudes and frequencies for ungaged sites on ungaged streams; (2) determining weighted peak-flow magnitudes and frequencies for gaging stations; and (3) using the drainage-area ratio method for determining peakflow magnitudes and frequencies for ungaged sites near a gaging station on the same stream and ungaged sites between two gaging stations on the same stream.

Table of Contents

Abstract

Introduction

Purpose and scope

Acknowledgments

Previous studies

General description of study area

Basin and climatic characteristics

Analysis of generalized skew coefficient

Peak-flow magnitude and frequency relations for gaging stations

Peak-flow magnitude and frequency relations for ungaged sites on ungaged streams

Development of regression equations

Limitations on use of the regression equations

Weighted peak-flow magnitude and frequency relations for gaging stations

Peak-flow magnitude and frequency relations for ungaged sites near a gaging station on the same stream

Examples of estimating peak-flow magnitudes for selected frequencies for ungaged sites and for gaging stations

Regression equations to compute peak-flow magnitudes for selected frequencies for ungaged sites on ungaged streams

Weighted peak-flow magnitudes for selected frequencies for gaging stations

Peak-flow magnitudes for selected frequencies for an ungaged site near a gaging station on the same stream

Peak-flow magnitudes for selected frequencies for an ungaged site between two gaging stations on the same stream

Data needs for improving regional peak-flow frequency analyses

Summary

References cited

Supplemental information

 

 


For more information contact:

District Chief

U.S. Geological Survey

1608 Mt. View Rd.

Rapid City, SD 57702

Copies of this report can be purchased from:

U.S. Geological Survey

Branch of Information Services

Box 25286

Denver, CO 80225-0046

 


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U.S. Department of the Interior, U.S. Geological Survey
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Last modified: Monday, March 13 2006, 05:32:03 PM
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