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Figure V-4A: Typical Downspout Dispersion Trench <br /> level outlet <br /> �s*�r►Fic lr��1l.�MrrK <br /> i 6"min. ,.�it��,s�af,�„ns <br /> 18"min, e i�4 .t+a*•t 7"a 4" rf. E <br /> ee«. s i�+4s+ Pe Ply <br /> $.wit 44po ,ioaiP <br /> 11/2"-3., <br /> 1. 24"min, -- washed rock <br /> Trench X-Section <br /> small catch basin or <br /> yard drain <br /> slope w <br /> NI 2'x 10" <br /> level trenches <br /> I <br /> e 350 sq.ft. <br /> Type 1 C8 <br /> >350 sq.ft, standard dispersion <br /> trench wl notched grade <br /> board length 10"per 350 <br /> I sq.ft of roof area <br /> Plan View of Roof <br /> Source:King County Department of Natural Resources,1998 NOT TO SCALE <br /> V► <br /> ffill <br /> . 11 <br /> Typical Downspout Dispersion Trench <br /> �� Revised December 2016 <br /> DEPARTMENT OF <br /> ECOLOGYPlease see http://www.ecy.wa.govitopyrighthtml 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 715 <br />