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0%k1NTECH` OPERATION AND ENGINEERED SOLUTIONS MAINTENANCE CatchBasin StormFilter'" Important: These guidelines should be used as a part of your site stormwater plan. Overview The Catch Basin StormFilterT" (CBSF) consists of a multi-chamber The concrete and plastic units operate similarly minus the steel, concrete, or plastic catch basin unit. The steel CBSF is presence of the inlet chamber or deep sump. offered both as a standard and as a deep unit for additional internal overflow and sediment capacity. Once in the cartridge chamber, polluted water ponds and percolates horizontally through the media in the filter cartridges. The CBSF is installed flush with the finished grade and is Treated water collects in the cartridge's center tube from where applicable for both constrained lot and retrofit applications. it is directed to the outlet chamber and discharged to the outlet Steel and concrete units can accept surface and piped influent pipe on the downstream side of the overflow weir. for roof leaders or similar applications. When influent flows exceed the water quality design value, The steel, concrete and plastic CBSF units have capacities of excess water spills over the overflow weir, bypassing the 4, 8 and 2 cartridges, respectively. Internal overflow capacity cartridge bay, and discharges to the outlet pipe. varies by system type from 0.5 cfs for the plastic, 1.3 cfs for the concrete and 1.0 or 1.8 cfs for the steel unit. Applications The CBSF is particularly useful where small flows are being Design Operation treated or for sites that have little available hydraulic head. The The CBSF is installed as the primary receiver of runoff, similar unit is ideal for applications in which standard catch basins are to a standard, grated catch basin. The steel and concrete CBSF to be used. Both water quality and catchment issues can be units have an H-20 rated, traffic bearing lid that allows the filter resolved with the use of the CBSF. to be installed in parking lots, and for all practical purposes, takes up no land area. Plastic units can be used in landscaped areas or other non-traffic-bearing applications. Retro-Fit The retrofit market has many possible applications for the CBSF. The CBSF can be installed by replacing an existing catch basin The steel CBSF consists of a sumped inlet chamber and without having to "chase the grade,"thus reducing the high cost cartridge chamber(s). Runoff enters the sumped inlet chamber of re piping the storm system. either by sheet flow from a paved surface or from an inlet pipe discharging directly to the unit vault. The inlet chamber is equipped with an internal baffle, which traps debris and floating oil and grease, and an overflow weir. While in the inlet chamber, heavier solids are allowed to settle into the deep sump, while lighter solids and soluble pollutants are directed into the cartridge chamber through a port between the baffle and the overflow weir. Page 1 www.ContechES.com/stormwater 800-338-1122 ©2020 Contech Engineered Solutions,a Quikrete Company