Patent ID: 7182874

Claim:
An assembly for treating stormwater, said assembly unit comprising: a pass-through member, having an inlet, an outlet and a longitudinal axis; a first vortex separator located between said inlet and outlet, said first vortex separator comprising a first hollow cylindrical wall open at both ends, and disposed orthogonally relative to the longitudinal axis of the pass-through member; said first wall comprising an inner surface and an outer surface; a first transport passageway in fluid communication with said pass-through member and said first vortex separator, the transport passageway disposed to direct stormwater flow tangentially to the inner surface of said first separator wall; a first weir positioned within said pass-through member downstream of said first transport passageway to direct low stormwater flow via said transport passageway to said vortex separator; a second vortex separator located between said inlet and outlet, said second vortex separator comprising a second hollow cylindrical wall open at both ends, and disposed orthogonally relative to the longitudinal axis of the pass-through member; said second wall comprising an inner surface and an outer surface; a second transport passageway in fluid communication with said pass-through member and said second vortex separator, said second transport passageway disposed to direct stormwater flow tangentially to the inner surface of said second separator wall; and a second weir downstream of both said first weir and said second transport passageway, said second weir larger than said first weir, to direct a high flow of stormwater via the second transport passageway to the second vortex separator.