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Figure 1/41.1: Typical Downspout Infiltration Trench <br /> I <br /> Plan View <br /> 4"rigid or 6"flexible roof <br /> perforated pipe drain <br /> ...--- --,,,. <br /> ( ) <br /> ( ) sump w/solid lid <br /> infiltration trench <br /> roof drain <br /> .e. <br /> ...L., <br /> overflow <br /> Profile View 4"rigid or 6"flexible splash block <br /> perforated pipe CB sump <br /> 1.-----*----1 <br /> --,.. <br /> -,..7.... <br /> 12" .;,-,',. washed rock 1 Y2"-34" ,,,W410-710,..44,c'It'al- <br /> e ttz - <br /> l':int min <br /> Ts . A fine mesh screen <br /> varies III‘ <br /> "...- 10'min, 5'min, -.- <br /> Section AA : <br /> filter fabric compacte:4-backfill <br /> ----___ ---___ <br /> I 6" <br /> A Vr';::•:'-i:-:*".,:,`','",..n.t'',:'21- 1 <br /> ***Z•V‘,..,-•,`,'7'.',1.::,1,;.;.7{,,,.,,,', <br /> '*tirliD;IF.IIVIP.I11.4 <br /> It.10:011i, 1").4....41165 <br /> 24" __I <br /> 7...•1"- ; '" -7•17.1. 4"rigid or 6"flexible <br /> t li;filiPiAllktifiell <br /> perforated pipe <br /> 12" •;•;..Iii.till,,,,t,40,4„.iir,..001 <br /> 1 11X+744+-0t.:r <br /> washed rock 1 Y2" <br /> rittr.ziti u=r1=11— <br /> _, <br /> .1 24" w I NOT TO SCALE <br /> illtd11101111 <br /> . 111 Typical Downspout Infiltration Trench <br /> 1111101111 Revised June 2016 <br /> DEPARTMENT OF <br /> ECOLOGYPlease see httpliWwwecy.wa.goutcopyrighthtrnifor copyright notice including permissions, <br /> State of Washington limitation of liability,and disclaimer. <br /> 2019 Storm water Management Manual for Western Washington <br /> Volume V-Chapter 4-Page 709 <br />