How it works

The Downstream Defender has internal components designed to advance vortex separation by minimizing turbulence and headloss, increasing efficiency, and preventing washout of stored pollutants.

Stormwater is introduced tangentially into the side of the vessel, generating a rotating flow that spirals around the outside of the dip plate (red arrow).

Oils, trash and floatable debris rise to the water surface and are trapped in the oil and floatables storage volume (yellow zone).

As flow continues to spiral down around the dip plate cylinder, low energy vortex motion directs sediment inward along the benching skirt and into the protected sediment storage zone (brown zone).

The benching skirt and center cone redirect the rotating flow up and inward between the center shaft and dip plate cylinder away from the stored sediment. The outlet pipe discharges treated effluent from within the dip plate cylinder ensuring the longest possible residence time (blue arrow).

Advanced vortex separation is provided by extending and stabilizing the flow path while protecting trapped pollutants for a wide range of flow rates.

For more information, download the Downstream Defender Flyer