Abstract
Hydrograph methods are used to identify functional dependencies of the rational-method runoff coefficient, and nested intensity-duration-frequency (IDF) rainfall distributions are used to evaluate the assumption that a uniform rainfall intensity with duration equal to the time of concentration leads to the maximum peak runoff rate. Key findings of this study are that the runoff coefficient can have a substantial dependence on both the IDF function and the time of concentration of the catchment, the runoff coefficient can take on values greater than one, and the peak runoff rate is underestimated by assuming a constant rainfall intensity of duration equal to the time of concentration.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 145 • Issue 6 • June 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Aug 19, 2018
Accepted: Dec 13, 2018
Published online: Mar 18, 2019
Published in print: Jun 1, 2019
Discussion open until: Aug 18, 2019
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