Abstract: A removable filter assembly includes a relatively thin support grate positioned on top of an inlet grate, a filter fabricated from a geotextile material is positioned on the support grate and has an appropriate filter size for removing suspended particulate materials from ground water before the ground water passes into the catch basin, and a covering grate positioned above the filter for protecting the filter from contact damage caused by passing vehicular traffic. The cover includes depending sides for positioning the covering grate and blocking flow. In one embodiment, the support grate has a plurality of spaced apart pads around the exterior thereof, and the filter is placed on the support grate and over the pads. The pads extend into holes in the covering grate to trap the filter therebetween. The covering grate also has a depending peripheral flange that depends downwardly to circumscribe the support grate and an upper portion of the inlet grate.