Operation

Stormwater runoff may enter the Deflective Screening Device (DSD) via one or more inlet pipes or by grated inlet. Water enters the inlet bay where it is directed to the curved inlet channel. This channel is curved and directs flow into the vortex chamber at an increased velocity along its inner wall creating a clockwise flowing vortex. This vortex helps to capture all trash, debris and suspended solids in the center of the chamber. This vortex continues downward into the screening cylinder area of the device. The water flow caused by the vortex creates a “self-cleaning” effect along the surface of the screen preventing clogging of the screen. As treated water passes through the screen it rises toward the outlet. The Oil baffle traps and retains oils, grease and other hydrocarbons from flowing toward the outlet. Flows above the screen capacity bypass over the weir and straight to the outlet pipe. This configuration prevents any scouring of previously captured trash or sediment during higher flows.