United States Department of Transportation
i
The Effectiveness of Permanent Highway Runoff Controls: Sedimentation/Filtration Systems
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1998-09-01
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[PDF-2.13 MB]
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Edition:Research Report (9/96-8/97)
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Abstract:Original Report Date: October 1997. This study evaluates the performance of sedimentation/ filtration systems that are the most common control for treating highway runoff in the Edwards Aquifer recharge zone. The study includes: 1) monitoring and evaluating the Seton Pond sedimentation/filtration facility in Austin, Texas, and 2) evaluating the factors that affect sedimentation in a prototype detention basin. Results from the Seton Pond facility show that sedimentation/filtration is an excellent form of treatment for runoff captured in the system; however, the poor hydraulic performance of the sand filter reduces the facility's capture capacity and increases the quantity of untreated runoff that bypasses the system. Results from the prototype experiments show that detention time is more important than outlet design for achieving satisfactory removal of constituents in runoff. Treatment by sedimentation alone is comparable to sedimentation/filtration when adequate and consistent detention times are achieved.
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