General Stochastic Unit Hydrograph
Publication: Journal of Irrigation and Drainage Engineering
Volume 120, Issue 1
Abstract
Unit hydrographs for a gaged site can be determined from observed events. If several events are used for the derivation, several unit hydrographs result. An averaging procedure must be used to achieve a single representative unit hydrograph. The variability is due to inherent uncertainty in the rainfall processes and to inadequacies in the basic model. It is appropriate to consider the unit hydrograph itself a random function. This paper develops a stochastic expression for the instantaneous unit hydrograph (IUH) based upon the Nash cascade. This conceptual model holds the number of reservoirs constant, while treating the reservoir constant as a random variable. Records of 24 storm events, observed on a 12.2‐km2 watershed located in north central Missouri, were studied. The results of the study indicate that the stochastic model can be used to estimate the hydrograph.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 120 • Issue 1 • January 1994
Pages: 138 - 148
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Jul 8, 1992
Published online: Jan 1, 1994
Published in print: Jan 1994
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