Determination of the Water-Quality Rainfall and Design Drawdown Time of Stormwater Control Measures
Publication: Journal of Environmental Engineering
Volume 150, Issue 9
Abstract
Stormwater control measures (SCMs) are designed to treat the runoff from a water-quality rainfall (WQR). The design of SCMs also requires specification of a drawdown time which is limited by the characteristic interevent time, and it commonly is overlooked that the WQR is not independent of the characteristic interevent time. A procedure is proposed for extracting the relation between the WQR and the characteristic interevent time so that consistent specifications can be developed for WQR and design drawdown time. The proposed procedure was demonstrated for South Florida, where it is shown that, for a given minimum interevent time of 6 h, the limiting design drawdown times of SCMs decrease with increasing percentile rainfall amounts, and that design drawdown times of less than 20 h might be needed to provide a reliability of 50% that water quality basins will fully drain the water-quality volume prior to the next event. It also is shown that both the WQR and the limiting design drawdown time are sensitive to the minimum interevent time that is used to separate rainfall measurements into discrete rainfall events.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. Some or all data, models, or code used during the study were provided by a third party. Direct requests for these materials may be made to the provider as indicated in the Acknowledgements.
Acknowledgments
The rainfall data used in this study were obtained from the DBHYDRO database maintained by the South Florida Water Management District. This database is available at https://www.sfwmd.gov/science-data/dbhydro.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 150 • Issue 9 • September 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jan 6, 2024
Accepted: Apr 3, 2024
Published online: Jul 8, 2024
Published in print: Sep 1, 2024
Discussion open until: Dec 8, 2024
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