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Techniques for estimating flood discharges for Oklahoma streams; techniques for calculating magnitude and frequency of floods in Oklahoma from rural and urban areas under 2500 square miles, with compilations of flood data through 1975

Water-Resources Investigations Report 77-54

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Abstract

Statewide regression equations are defined for estimating peak discharges of floods having recurrence intervals ranging from 2 to 500 years. Contributing drainage area, main-channel slope and mean annual precipitation are the independent variables required for estimating flood discharges for rural streams. For urban streams the percentage of the basin that is impervious and served by storm sewers also is required. The regression equations are applicable for watersheds draining less than 2,500 square miles (6,500 square kilometers) that are not significantly affected by regulation. For the rural streams, the regression equations are presented in graphical form for easy application. Calibration of the U.S. Geological Survey rainfall-runoff model and synthesis of long-term annual peak data for 60 small watersheds is discussed. Synthetic frequency curves, generated using six long-term rainfall stations, are combined into one frequency curve and weighted with the observed frequency curve at each site. Use of the rainfall-runoff model parameters to estimate flood discharges reduces the standard error for selected frequencies by 9-12 percent. However, collection of the necessary rainfall-runoff data to determine the model parameters is time consuming and expensive. Annual peak data, basin and climatic characteristics, log-Pearson Type III statistics, and the flood-frequency relations are presented for 188 gaging stations. (PHOTOSTATIC COPIES ONLY ARE AVAILABLE OF THIS REPORT)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Techniques for estimating flood discharges for Oklahoma streams; techniques for calculating magnitude and frequency of floods in Oklahoma from rural and urban areas under 2500 square miles, with compilations of flood data through 1975
Series title:
Water-Resources Investigations Report
Series number:
77-54
Edition:
-
Year Published:
1977
Language:
ENGLISH
Publisher:
U.S. Geological Survey, Water Resources Division,
Description:
v, 170 p. :ill., maps ;26 cm.