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roof <br />grass <br />overflow 6" min <br />n pD <br />1112"-3f4' <br />washed rock J o Oct qo a NOTE: Same length ckmensions <br />4 a 18" min <br />Pao" <br />a ° j and site limitations as typical system <br />P4aoa p°°� <br />LZ min _��. ____ _ 15' min <br />X-SECTION <br />NTS <br />Figure 3.1.3 - Alternative Downspout Infiltration Trench System for Coarse Sand and Gravel <br />Sourcc: King County <br />Volume III— Hydrologic Analysis and Floe Control BMPs — December 2014 <br />3-8 <br />