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roo# <br />drain <br />PLAN VIEW <br />NT$ 4' rigid or 6' flexible <br />perforated pipe <br />•-------------- infiltration trench------------• sump w/sdid lid <br />PLAN VIEW roof drain <br />NTS <br />overflow <br />4' rigid or 6' flew-ble splash block <br />perforated pipe <br />6. <br />6' 1° D _ <br />O <br />washed rock 46 41a °p° Q O A S 1� SO min <br />12' • ° Ll = 1 1/2'-V4' C- 4'e ° ° Cl qQ Q i' min <br />L: <br />--------------------- ° -� <br />re fine mesh sce �— CB sump w/solid lid <br />10' min <br />varies <br />A <br />filter fabric <br />compacted ba ckfill <br />4' rigid or 6' flexible <br />pop ° op ° perforated pipe <br />24' o 0 <br />G a o <br />Dpa��oD°p°a <br />12, a 4° {79 a washed rock <br />°p°tea°° a0 <br />4°Q 1 1I2"-3i4' <br />SECTION A <br />NTS <br />Figure 3.1.2 - Typical Downspout Infiltration Trench <br />Source: King County <br />Volume III — Hydrologic Analysis and Flow Conn-ol BMPs — December 2014 <br />3-7 <br />