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Figure V-4.1: Typical Downspout Infiltration Trench <br /> Plan View <br /> 4"rigid or 6"flexible roof <br /> Perforated pipe drain <br /> ----------- ----- <br /> ( l <br /> �l <br /> ` —______________-- sumpvj/solid lid <br /> infiltration trench <br /> roof drain <br /> eblock <br /> Profile View 4"rigid or 6"flexible sp <br /> A <br /> perforated pipe CB sump <br /> vd/solid lid <br /> 6" _ <br /> 6" <br /> 12" washed rock 1 Y2" %a" <br /> Afine mesh screen <br /> varies <br /> 10'min. 5'min. <br /> Section A-A filter fabric <br /> compacted backfill <br /> 6" - <br /> 24 4"rigid or 6"flexible <br /> 12" perforated pipe <br /> washed rock 1 y"-3/4" <br /> i <br /> 24 NOT TO SCALE <br /> Typical Downspout Infiltration Trench <br /> Revised June 2016 <br /> DEPARTMENT OF <br /> ECOLOGYplease see http.'1Avww.ecy.wa.gov/copyrfght.html for copyright notice including permissions, <br /> State of Washington limitation of liability,and disclaimer. <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume V-Chapter 4-Page 709 <br />