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Evaluation Of The Performance Of Permanent
Runoff Controls: Summary And Conclusions
By Barrett, M.E., Keblin, M.V., Walsh, P.M., Malina, J.F., Jr.,
and Charbeneau, R.J.
ABSTRACT
This study investigated the capability vegetative controls (grassed
swales and vegetated buffer strips) and sedimentation/filtration
systems for treating highway runoff. A grassed swale was constructed
in an outdoor channel to investigate the impacts of swale length,
water depth, and season of the year on removal efficiency. Swales
were found to provide effective treatment all year. Two vegetated
strips treating highway runoff in the Austin, Texas, area also were
monitored to determine removal capabilities. Reductions in pollutant
loads in the filter strips was comparable to that obtained with
more complex controls. Results from monitoring the Seton Pond facility
show sedimentation/filtration is an excellent form of treatment
for runoff captured in the system. Controlled laboratory experiments
indicate that with sufficient detention time, sedimentation offers
comparable treatment to systems that incorporate filtration.
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