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A technique for estimating time of concentration and storage coefficient values for Illinois streams

Water-Resources Investigations Report 82-22

Prepared in cooperation with the Illinois Department of Transportation Division of Water Resources
By:
, , and

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Abstract

Values of the unit hydrograph parameters time of concentration (TC) and storage coefficient (R) can be estimated for streams in Illinois by a two-step technique developed from data for 98 gaged basins in the State. The sum of TC and R is related to stream length (L) and main channel slope (S) by the relation (TC + R)e = 35.2L0.39S-0.78. The variable R/(TC + R) is not significantly correlated with drainage area, slope, or length, but does exhibit a regional trend. Regional values of R/(TC + R) are used with the computed values of (TC + R)e to solve for estimated values of time of concentration (TCe) and storage coefficient (Re). The use of the variable R/(TC + R) is thought to account for variations in unit hydrograph parameters caused by physiographic variables such as basin topography, flood-plain development, and basin storage characteristics. (USGS)

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Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
A technique for estimating time of concentration and storage coefficient values for Illinois streams
Series title:
Water-Resources Investigations Report
Series number:
82-22
Year Published:
1982
Language:
English
Publisher:
U.S. Geological Survey, Water Resources Division,
Publisher location:
Urbana, IL
Description:
v, 10 p.
Country:
United States
State:
Illinois
Online Only (Y/N):
N
Additional Online Files(Y/N):
N