A Media Filter Drain is a stormwater best management practice (BMP) that treats highway runoff.
Federal, state, and local water quality regulations prohibit the discharge of turbid water from construction activities into adjacent water bodies and require WSDOT to use approved Best Management Practices (BMPs). The water quality and stormwater BMPs can be found in the Highway Runoff Manual and the Standard Specifications for Road, Bridge, and Municipal Construction.
Additional Stormwater Management Resources
Compost Amended Vegetated Filter Strip (CAVFS)