Release Time Component of a Hydrograph
Publication: Journal of Hydrologic Engineering
Volume 19, Issue 2
Abstract
Excess rainfall release time is one of the most important temporal components of a hydrograph and is often equated with time of concentration; however, this study will demonstrate that these two components are basically different and must be discriminated from each other. A formula for estimation of release time principled on Clark hydrograph is also proposed. This research introduces another concept of partial release time, and a parametrical equation for its estimation is suggested. Furthermore, the fundamental relation between time base and excess rainfall duration for linear systems is clarified, giving rise to a formula for time base of Clark hydrograph. Finally, it will be theoretically shown that release time is the temporal dependency between the rainfall and runoff in each event, and hence it plays a crucial role in event-based rainfall–runoff-forecasting models.
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Acknowledgments
This research could not be accomplished without the financial support of University of Tehran and Iowa Flood Center. The authors would like to thank the providers of HEC-HMS for support in developing RRMC. We also appreciate the anonymous honorable reviewers for their constructive remarks.
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Information & Authors
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Published In
Journal of Hydrologic Engineering
Volume 19 • Issue 2 • February 2014
Pages: 444 - 447
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 24, 2010
Accepted: Jan 22, 2013
Published online: Jan 24, 2013
Discussion open until: Jun 24, 2013
Published in print: Feb 1, 2014
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