The Effectiveness of Permanent Highway Runoff
Controls: Sedimentation/Filtrations Systems
By Keblin, M.V., Barrett, M.E., Malina, J.F., Jr., and Charbeneau,
R.J.
ABSTRACT
This study evaluates the performance of sedimentation/filtration
systems which 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, TX and 2) evaluating the factors that effect 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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