Overland Flow Hydrographs for SCS Type II Rainfall
Publication: Journal of Irrigation and Drainage Engineering
Volume 111, Issue 3
Abstract
A mathematical model, which is founded on the kinematic‐wave and Green‐Ampt equations, is presented for the conjunctive overland flow‐infiltration process. Within the context of this model, it is shown that overland flow resulting from a specified time distribution of rainfall intensity can be described in terms of only three physically‐based nondimensional parameters. In cases where a less precise geometric shape is adequate, overland flow hydrographs for the 24‐hr SCS‐Type II rainfall can be approximated by triangular hydrographs. It is possible to evaluate the elements of such a triangular hydrograph in terms of the three governing physically‐based parameters of the overland flow‐infiltration process without using a computer. A dimensionless standardized triangular hydrograph is proposed that predicts the peak discharge, the time of occurrence of the peak discharge, and the volume of runoff before and after the hydrograph peak.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 111 • Issue 3 • September 1985
Pages: 276 - 286
Copyright
Copyright © 1985 ASCE.
History
Published online: Sep 1, 1985
Published in print: Sep 1985
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