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Method for estimating the magnitude and frequency of floods at ungaged sites on unregulated rural streams in Iowa

Water-Resources Investigations Report 87-4132

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Abstract

Physiographic characteristics were used to define the boundaries of five hydrologic regions. Regional regression equations that relate the size of the drainage area to flood magnitude are defined for estimating peak discharges having specified recurrence intervals of 2, 5, 10, 25, 50, and 100 years. Drainage basin size was the most significant independent variable and it accounted for 71% to 95% of the variance in all cases. Discharge of selected mainstem streams where peak discharge is affected by factors of basin geometry was determined graphically. The method is only applicable to sites on ungaged streams that are not affected significantly by regulation upstream from the sites and in which the areas upstream from the sites are not mostly urban areas. (Lantz-PTT)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Method for estimating the magnitude and frequency of floods at ungaged sites on unregulated rural streams in Iowa
Series title:
Water-Resources Investigations Report
Series number:
87-4132
Edition:
-
Year Published:
1987
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
34 p. :ill., map ;28 cm.