Patent ID: 6287459
Filing Date: 2001-09-11
Classification: B01D,E03F

Abstract:
A drainwater treatment system positionable within the flow passage of a drainage system having a surface opening through which drainwater enters the drainage system and a vertical passageway which extends downwardly from the surface opening, the treatment system comprising:catch basin means positionable within the vertical passageway of the drainage system for accepting all of the drainwater expected to flow downwardly into the vertical passageway from the surface opening, the catch basin means including outer sidewalls for extending downwardly into the vertical passageway and which are disposed on opposite sides of the treatment system from one another, the catch basin means further including means defining an upper edge across which drainwater is permitted to flow from the catch basin means when the drainwater collected within the catch basin means reaches the level of the upper edge, the upper edge of the upper edge-defining means having opposing portions which are disposed laterally inwardly of the outer sidewalls of the catch basin means and which are laterally spaced apart from one another so that drainwater which is permitted to flow across the opposing portions of the upper edge flows inwardly of the outer sidewalls of the catch basin means and so that drainwater which flows across one of the opposing portions of the upper edge flows in a direction thereacross which is opposite the direction in which drainwater flows across the other of the opposing portions of the upper edge;a filter-supporting section associated with the catch basin means for accepting drainwater which flows out of the catch basin means and across the upper edge of the upper edge-defining means so that the drainwater accepted by the filter-supporting section flows downwardly therethrough;filter means including at least one filter which is supported within the filter-supporting section for filtering contaminants from the drainwater which flows downwardly through the filter-supporting section; andmeans associated with the catch basin means and the filter-supporting section providing an overflow through which drainwater is permitted to bypass the filter means and continue to flow along the drainage system when the flow rate of drainwater into the system exceeds the rate at which drainwater is permitted to flow downwardly through the filter means.