Patent ID: 8496814

Claim:
a baffle box drain system, comprised of a rectangular box inserted in the flow stream of a drain, the drain possessing an inflow end and an outflow end, the rectangular box divided into a plurality of separation chamber compartments, each compartment without a top, the compartment tops below the level of the inflow end and outflow end of the rectangular box, the drain and rectangular box situated such that water enters the box at the inflow end and flows over the tops of the plurality of compartments allowing sediment and solid pollutants to be trapped in the compartments, the last compartment at the outflow end possessing a baffle, an absorbent boom, and a horizontal upflow filter, the baffle a solid vertical barrier across the rectangular box with a bottom opening leading into the last compartment and a top that extends in height above the tops of the other compartments, said height selected to force water flow below the baffle without restricting the flow rate of water through the outflow end during flooding, the baffle attached in its middle to the upflow filter, the length of the baffle extending below the attachment point to the upflow filter selected to balance the flow rate of drain water into the last compartment through the bottom opening with the flow rate of water through the upflow filter, the upflow filter situated such that water rising from the last compartment leaves through the outflow end of the drain due to water pressure formed in the last compartment, said water forced up through the upflow filter, said upflow filter designed to remove fine and dissolved pollutants from the drain water.