Filter assembly for use in drainage system

摘要

A filter assembly for use in drainage systems to prevent the buildup of eroded materials such as soil, leaves and other debris. The assembly includes a unitary frame and a filter media attached to the frame and is adapted to be retained within a component of a drainage sewer such as a catch basin. A porous material filter media such as a woven or non-woven geotextile allows for the flow of water through the filter while retaining debris or soil within the filter. The filter media extends into the basin to provide volume for the retained material without blocking the entire surface of the filter.

主权项

1. A filter in combination with a drainage system including a grate assembly, the grate assembly having a detent extending inwardly from a peripheral sidewall to form an upwardly-facing surface supporting a downwardly-facing surface of a removable drainage grate, the filter comprising:
(a) an enclosed loop frame sandwiched between the downwardly facing surface of the grate and the detent's upwardly facing surface, the frame encircling an interior space; (b) a filter media having a sump area for collecting debris, an upper edge, and at least one pocket formed around said upper edge enclosing at least a portion of the frame; (c) at least a first supportive webbing extending contiguously from a first side of the upper edge beneath the filter media sump area to a second side of the upper edge opposite the first side, the first supportive webbing having opposing ends attached to an outside surface of the filter media at said at least one pocket, beneath the grate, and within the frame's interior space; (d) at least a second supportive webbing extending contiguously from a third side of the upper edge beneath the filter media sump area to a fourth side of the upper edge opposite the third side, the second supportive webbing having opposing ends attached to an outside surface of the filter media at said at least one pocket, beneath the grate, and within the frame's interior space; wherein the first and second supportive webbings cross at a transverse intersection beneath the sump area to support the weight of any debris in the sump area; and wherein all portions of the filter remain substantially below an upwardly-facing surface of the grate in operable orientation.