Detention and Retention Controls for Urban Runoff

by Eugene D. Driscoll, Woodward Clyde Consultants, Oakland, NJ, USA,

Document Type: Proceeding Paper

Part of: Urban Runoff Quality: Impact and Quality Enhancement Technology


The operating principle for retention devices is the interception and capture of runoff, preventing its direct release to surface waters. The most common mechanism by which captured runoff is diverted is by infiltration. Performance efficiency is measured by the fraction of total runoff that is prevented from discharging to a surface water body. Virtually all runoff that enters the detention device is ultimately discharged to surface waters. Performance efficiency is measured by the reduction in pollutant concentrations, and hence mass loads that result from physical (sedimentation) or other (biological) processes that are given a chance to operate during the residence time that runoff is detained in its passage through the basin. This paper discusses basin design, sediment accumulation, basin sizing, and other aspects of the subject.

Subject Headings: Surface water | Urban areas | Runoff | Quality control | Biological processes | Basins | Municipal water | Water pollution

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