Patent ID: 9273457
Filing Date: 2016-03-01
CPC Classification: E03F

Claim Text:
1. A baffle box drain system, comprised of a structure defined by a floor, walls and top inserted in the flow stream of a drain, the drain possessing an inflow end and an outflow end, the structure divided into a plurality of separation chambers, each chamber with an open top, the chamber tops below or equal to the level of the inflow end and outflow end of the structure, the drain and structure situated such that water enters the structure at the inflow end and flows over the tops of the plurality of chambers allowing sediment and solid pollutants to be trapped in the chambers, the last chamber at the outflow end possessing a baffle and a horizontal upflow filter, the baffle a solid vertical barrier across the structure with a bottom opening leading into the last chamber and a top that extends in height above the tops of the other chambers, said height selected to force water flow below the baffle without restricting the flow rate of water through the outflow end during higher flows, 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 chamber 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 chamber leaves through the outflow end of the drain due to water pressure formed in the last chamber, said water forced up through the upflow filter, said upflow filter designed to remove fine and dissolved pollutants from the drain water, the upflow filter comprised of one or more compartments containing a material capable of removing contaminants from passing water, the top of said upflow filters defined by one or more fixed or hinged doors that can be opened to remove or insert said filter material.