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Figure V-4.4: Typical Downspout Dispersion Trench <br /> level outlet <br /> 6"min. <br /> 18"min. 4" pert. pipe <br /> 1Y2"-y4' <br /> 24"min. t washed rock <br /> Trench X-Section <br /> small catch basin or <br /> yard drain <br /> slope 11� <br /> 2'x 10' <br /> level trenches <br /> <350 sq.ft. <br /> Type 1 CB <br /> >350 sq.ft. standard dispersion <br /> trench w/notched grade <br /> board length 10'per 350 <br /> sq.ft.of roof area <br /> Plan View of Roof <br /> Source:King County Department of Natural Resources,1998 NOT TO SCALE <br /> Typical Downspout Dispersion Trench <br /> Revised December 2016 <br /> DEPARTMENT OF <br /> ECOLOGYPlease see http.'1Avww.ecy.wa.gov/copyrfght.html for copyright notice including permissions, <br /> State of Washingtonj limitation of liability,and disclaimer. <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume V-Chapter 4-Page 715 <br />