Dual BMPs at DOT Parking Lot No. 744

Located in South Central L.A. and utilizes both a Catch Basin Insert and an Infiltration Trench.

Runoff from the parking lot drains into the grating basin where an oil absorbent material made by Enviro Drain is installed. From the grating basin, runoff flows through a 6" pipe to the infiltration trench. The infiltration trench is 21′ L x 3′ W x 7.5′ D.

At the infiltration trench, the flow discharges through a 6" perforated pipe that run the length of the trench. The flow will percolate through a gravel bed, then a sand filter before it seeps into the ground.