Patent ID: 6083402
Filing Date: 2000-07-04
Classification: E03F

Abstract:
A stormwater drain construction for separating sediment from stormwater flowing into a sewer system inlet and for capturing liquid hydrocarbons contained in said stormwater in a filter with minimal sediment contacting the filter material during the separation process thereby minimizing filter contamination, said drain construction comprisinga water receptacle tank having an inlet rim and a raised central stormwater outflow outlet with a discharge height below said inlet rim, said tank being recessed into the ground and surrounding said sewer system inlet thereby permiting the discharge of filtered water therethrough at a generally equal volume flow rate around its central periphery and precipitation of sediment into said tank around said outlet, anda continuous porous floating boom disposed in said tank closely surrounding said outlet, said boom being formed of a netting containing a floating particulate which is hydrophobic and a liquid hydrocarbon absorber whereby stormwater flowing into said tank causes sediment washed thereinto therewith to precipitate to the bottom of said tank around the outside periphery of said sewer system inlet for subsequent removal and liquid hydrocarbons suspended in said stormwater to float to the surface thereof in said tank whereby when said hydrocarbons contact said boom by the outflow movement of said stormwater in said tank toward said outlet said hydrocarbons are thereby absorbed and prevented from flowing through said outlet and into said sewer system inlet.