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I Ci' NTECH® OPERATION AND I ENGINEERED SOLUTIONS MAINTENANCE 1 CatchBasin StormFiltern' Important: These guidelines should be used as a part of your site stormwater plan. IOverview The CatchBasin StormFilterT" (CBSF) consists of a multi-chamber Once in the cartridge chamber, polluted water ponds and steel, concrete, or plastic catch basin unit that can contain up to percolates horizontally through the media in the filter cartridges. Ifour StormFilter cartridges. The steel CBSF is offered both as a Treated water collects in the cartridge's center tube from where it standard and as a deep unit. is directed by an under-drain manifold to the outlet pipe on the downstream side of the overflow weir and discharged. IThe CBSF is installed flush with the finished grade and is applicable for both constrained lot and retrofit applications. It When flows into the CBSF exceed the water quality design can also be fitted with an inlet pipe for roof leaders or similar value, excess water spills over the overflow weir, bypassing the applications. cartridge bay, and discharges to the outlet pipe. The CBSF unit treats peak water quality design flows up to 0.13 Applications cfs, coupled with an internal weir overflow capacity of 1.0 cfs for The CBSF is particularly useful where small flows are being the standard unit, and 1.8 cfs for the deep steel and concrete treated or for sites that are flat and have little available hydraulic units. Plastic units have an internal weir overflow capacity of 0.5 head to spare. The unit is ideal for applications in which I cfs. standard catch basins are to be used. Both water quality and catchment issues can be resolved with the use of the CBSF. Design Operation IThe CBSF is installed as the primary receiver of runoff, similar Retro-Fit to a standard, grated catch basin. The steel and concrete CBSF The retrofit market has many possible applications for the CBSF. units have an H-20 rated,traffic bearing lid that allows the filter The CBSF can be installed by replacing an existing catch basin to be installed in parking lots, and for all practical purposes, without having to "chase the grade,"thus reducing the high cost takes up no land area. Plastic units can be used in landscaped of re piping the storm system. areas and for other non-traffic-bearing applications. The CBSF consists of a sumped inlet chamber and a cartridge chamber(s). Runoff enters the sumped inlet chamber either Iby 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 Ioil 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 under the baffle Iand into the cartridge chamber through a port between the baffle and the overflow weir. I I Page 1 www.ContechES.cm/stormwater RBAN REEN4'��% www.ContechES.conn/stormwater Stormwater Solutions from Contech ' ©2013 Contech Engineered Solutions