Effectiveness of Extended Detention Ponds

by T. J. Grizzard, Occoquan Watershed Monitoring Lab, Manassas, VA, USA,
C. W. Randall, Occoquan Watershed Monitoring Lab, Manassas, VA, USA,
B. L. Weand, Occoquan Watershed Monitoring Lab, Manassas, VA, USA,
K. L. Ellis, Occoquan Watershed Monitoring Lab, Manassas, VA, USA,



Document Type: Proceeding Paper

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

Abstract:

Field and laboratory studies of the performance of detention facilities for the removal of selected pollutants from urban stormwater were conducted. The laboratory studies consisted of the measurement of pollutant concentration reductions as a result of quiescent settling of stormwater in plexiglass columns. The studies were carried out for stormwaters of low, moderate, and high initial suspended solids. Measurements were also made of particle size distribution changes during the settling studies. A full scale detention pond was also retrofitted with a restricted release structure to increase the residence time of the average stormwater event. Long term measurements were made of pond inflow and outflow pollutant loads, and efficiencies of removal determined. Comparisons of laboratory and field data showed comparable results, and provide a basis for the selection of design parameters for full-scale facilities.

Subject Headings: Laboratory tests | Field tests | Water pollution | Stormwater management | Pollutants | Detention basins | Comparative studies

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