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Effects of urban development on the flood-flow characteristics of the Walnut Creek Basin, Des Moines Metropolitan area, Iowa

Water-Resources Investigations Report 78-11

Prepared in cooperation with the Iowa Natural Resources Council
By:

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Abstract

This report deals with the probable impact of urban development on the magnitude and frequency of flooding in the lover reach of the Walnut creek Basin.

Stream-modeling techniques, which include complete definition of unit hydroqraphs and precipitation loss-rate criteria, were utilized to evaluate the effects of urban development as measured by percentages of impervious area over the basin. A mathematical model, called HEC-1, was calibrated by using concurrent rainfall-runoff data collected at three gaging stations in the basin. The model parameters were regionalized to allow future users to estimate the model parameters for ungaged areas within the basin.

Long- term rainfall data recorded at two nearby stations were employed as basic input to the calibrated model to generate annual peak discharges corresponding to selected degrees of urbanization. Results are presented in tables and graphs, which coapare the pre-urban and urban flood flow characteristics of the lover reach of the Walnut Creek basin.

Study Area

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Effects of urban development on the flood-flow characteristics of the Walnut Creek Basin, Des Moines Metropolitan area, Iowa
Series title:
Water-Resources Investigations Report
Series number:
78-11
Year Published:
1978
Language:
English
Publisher:
U.S. Geological Survey, Water Resources Division
Publisher location:
Reston, VA
Contributing office(s):
Iowa Water Science Center
Description:
v, 31 p. :ill., maps ;28 cm.
Country:
United States
State:
Iowa
Other Geospatial:
Walnut Creek basin
Online Only (Y/N):
N
Additional Online Files (Y/N):
N