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r <br /> Chapter 4 - Best Management Practices for Erosion and Sediment Control <br /> PROMOE ADEOUATE POLYETHYLENE CAP <br /> « ST1APPING <br /> r <br /> -- - DEPTH <br /> -- VARIES AS <br /> TACK WELD - -- . REQUIRED <br /> e. PERFORATED POLYETHYLENE FOR ' DRY <br /> - - DRAINAGE TUBING, DIAMETER STORAGE <br /> VARIES (SEE CALCULATIONS IN <br /> APPENDIX 3.14—A) <br /> WET <br /> ' FERNco—SME ' COUPLING STORAGE <br /> r <br /> DEWATERING ORIFICE, <br /> CORRUGATED METAL RISER SCHEDULE 40 STEEL STUB 1 —FOOT MINIMUM, <br /> .� <br /> DIAMETER VARIES (SEE CALCULATIONS IN <br /> APPENDIX_ 3.14—A) <br /> Plate 4.26m Perforated Pipe Sediment Basin Dewatering Device <br /> Source: Virginia DSWC <br /> 6' <br /> Clean Masonry Sand Riser <br /> sw <br /> Welded or <br /> o <br /> p 4' fth Padon Plastic Placed Mortared Jo'uM1 <br /> Minirnorn with Pedoration5 Down Gullet <br /> 1_ <br /> r place Fuer Fabric <br /> Bedding over Pipe <br /> 10' <br /> Minimum Riser <br /> Gross-Section Drain Connection <br /> Pipe in Trench <br /> Embanbnent <br /> Edge of Pool <br /> Riser <br /> �Banel <br /> sees <br /> s <br /> zs s <br />.. S <br /> Pedorated Pipe in Trench NOTE: <br /> pian Yew <br /> r <br /> Bottom of Basin , <br /> Pmi le <br /> 5% Minimum Grade — —. <br /> Plate 4. 26n Dewatering a Sediment Basin with Subsurface Drain <br /> Source: NRCS <br /> r <br /> 4-97 <br />