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

January 1, 1994

This report provides techniques and procedures for estimating the probable magnitude and frequency of floods at ungaged sites on Iowa streams. 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. Regional regression equations are applicable to sites on streams that have drainage areas ranging from 0.04- to 5,150 square miles provided that the streams are not affected significantly by regulation upstream from the sites and that the drainage areas upstream from the sites are not mostly urban areas. Flood-frequency characteristics for the mains terns of selected rivers are presented in graphs as a function of drainage area.

Citation Information

Publication Year 1987
Title Method for estimating the magnitude and frequency of floods at ungaged sites on unregulated rural streams in Iowa
DOI 10.3133/wri874132
Authors O.G. Lara
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Water-Resources Investigations Report
Series Number 87-4132
Index ID wri874132
Record Source USGS Publications Warehouse
USGS Organization Iowa Water Science Center