Laserfiche WebLink
OPERATION <br />The Stormwater <br />Managerr ent StormFilter° <br />Cast-In-Place, Precast, and Linear Units <br />lmportant: These guidelines should be used <br />as a part of your site stormwafer <br />management plan. <br />Description <br />The 3tormwater Management StormFilter0 <br />(StormFilter) is a passive, flow-through, <br />stormwater filtration system. The system is <br />comprised oi one or more vaults that house <br />rechargeable, media-filled, filter cartridges. <br />The StonnFilter works by passing <br />stormwater through the media-filled <br />caRridges, which trap particulates and <br />adsorb materials such as dissolved metals <br />and hydrocarbons. Once filtered through the <br />media, the treated stormwater is directed to <br />a collection pipe or discharged into an open <br />channel drainage way. <br />The StormFilter is oft�red in multiple <br />configurations, including precast, linear, <br />catch basin, manhole, and cast-in-place. <br />Tlie precast, linear, manhole, and catch <br />basin models utilize pre-mani�factured units <br />to ease the design and installation <br />processes. The cast-in-place units are <br />customized for larger flows and may he <br />either covered or uncovered underground <br />units. <br />Purpose <br />The StormFilter is a passive, flow-through, <br />stormwater filtration system designed to <br />improve the quality of stormwater runoff <br />irom the urban environment before it enters <br />receiving waterways. It is intended to <br />(unction as a Best Management Practice <br />.� <br />STORMWATER <br />MANAGEMENT INC. <br />(BMP) to meet federal, state, and local <br />requirements for treating runoff in <br />compiiance with the Clean Water Act. <br />Through independent third party s;udies, it <br />has been demonstrated that the StormFilter <br />is highly effective for treatment of first flush <br />flows and (or treatrnent of flow-paced flows <br />during the latter part of a storm. In general, <br />the StormFilter's e�ciency is highest when <br />poilutant concentrations are highest. The <br />primary non-point source pollulants targeted <br />for removal by the StormFilter are: <br />suspended solids (TSS), oil and grease, <br />soluble metals, nutrients, organics, and <br />trash and debris. <br />Sizing <br />The StormFilter is sized to treat the peak <br />flow of a water quality design storrn. The <br />peak flow is determined from calcuiations <br />based on the contributing watershed <br />hydrology and from a design storm <br />magnitude set by the local stormwater <br />management agency. The particular size of <br />a StormFilter unit is determined by the <br />number of filter caRridges (see Figure 1) <br />required to treat this peak flow. <br />The flow rate through each filter cartridge is <br />adjustable, allowing control over the amount <br />of contact time between the influent and the <br />filter media. The maximum flow rate <br />through each cartridge can be adjusted to <br />between 5 and 15 gpm using a calibrated <br />restrictor disc at the base of each filter <br />cartridge. Adjustments to the cartridge Flow <br />rate will affect the number of cartridgec <br />required to treat the peak flow. <br />Basic Function <br />The StormFilter is designed to siphon <br />stormwater runoff through a filter cartridge <br />containing media. A variety of filter media <br />SlormH•ater A1anagemenl, Inc. 02004 StormFilter Operation and Maintenance GuideUnes 1 of 9 <br />