V4 12 Stormwater Maintenance Manual

EDS, ! TECHNICAL NOTE Retention/Detention System Maintenance TN 6.01 February 2007 This document is provided for informational purposes only and is meant only to be a guide. Individuals using this information should make their own decisions as to suitability of this guideline for their individual projects and adjust accordingly. Introduction A retention/detention system is comprised of a series of pipes and fittings that form an underground storage area, which retains or detains storm water runoff from a given area. As sediment and debris settle out of the detained stormwater, build up occurs that requires the system to be regularly inspected and cleaned in order for the system to perform as originally designed. The following provides the available fittings and guidelines for inspection and maintenance of an HDPE underground storage system. System Accessories and Fittings Concentric Reducers Concentric Reducers are fittings that transition between two pipes, either in line with one another or at perpendicular angles. The centerlines of the two pipes are at the same elevation. When a concentric reducer is used to connect the manifold pipe to the lateral pipes, most debris will be trapped in the manifold pipe. ll ©) SIDE VIEW SECTION VIEW SIDE VIEW SECTION VIEW Eccentric Reducers Eccentric Reducers are fittings that transition between two pipes, either in line with one another or at perpendicular angles. The inverts of the two pipes are at the same elevations. When an eccentric reducer is used to connect the manifold pipe to the lateral pipes, most debris will follow the flow of the storm water into the lateral pipes. th © On SIDE VIEW SECTION VIEW l s sae] SIDE VIEW SECTION VIEW 4640 TRUEMAN BLVD. HILLIARD, OH 43026. (800) 821-6710 - www.ads-pipe.com 4 ATNEOt GADS 2007