Technique for estimating the 2- to 500-year flood discharges on unregulated streams in rural Missouri

Alexander, Terry W.; Wilson, Gary L.

Abstract:

A generalized least-squares regression technique was used to relate the 2- to 500-year flood discharges from 278 selected streamflow-gaging stations to statistically significant basin characteristics. The regression relations (estimating equations) were defined for three hydrologic regions (I, II, and III) in rural Missouri. Ordinary least-squares regression analyses indicate that drainage area (Regions I, II, and III) and main-channel slope (Regions I and II) are the only basin characteristics needed for computing the 2- to 500-year design-flood discharges at gaged or ungaged stream locations. The resulting generalized least-squares regression equations provide a technique for estimating the 2-, 5-, 10-, 25-, 50-, 100-, and 500-year flood discharges on unregulated streams in rural Missouri. The regression equations for Regions I and II were developed from stream-flow-gaging stations with drainage areas ranging from 0.13 to 11,500 square miles and 0.13 to 14,000 square miles, and main-channel slopes ranging from 1.35 to 150 feet per mile and 1.20 to 279 feet per mile. The regression equations for Region III were developed from streamflow-gaging stations with drainage areas ranging from 0.48 to 1,040 square miles. Standard errors of estimate for the generalized least-squares regression equations in Regions I, II, and m ranged from 30 to 49 percent.

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USGS Numbered Series

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25895

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Alexander, Terry W.; Wilson, Gary L.

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ENGLISH

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iv, 33 p. :maps ;28 cm.

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U.S. Geological Survey ; Earth Science Information Center, Open-File Reports Section [distributor],

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Water-Resources Investigations Report

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WRI

Citation Series Number:

95-4231

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Technique for estimating the 2- to 500-year flood discharges on unregulated streams in rural Missouri; 1995; WRI; 95-4231; Alexander, Terry W.; Wilson, Gary L.

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1995

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citation/reference

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Technique for estimating the 2- to 500-year flood discharges on unregulated streams in rural Missouri; 1995; WRI; 95-4231; Alexander, Terry W.; Wilson, Gary L.