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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

Prepared in cooperation with the Iowa Department of Transportation, Highway Division, Highway Research Board
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Abstract

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.

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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
Year Published:
1987
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Iowa City
Contributing office(s):
Iowa Water Science Center
Description:
34 p.: ill., map; 28 cm.
Country:
United States
State:
Iowa
Online Only (Y/N):
N
Additional Online Files (Y/N):
N