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T:�Mc 3-2.2 Roof Rmio(f Infiltration Sy�tcm Sizing <br />Pr�nch Dimensions Required Length of Trench per 100 square ftet of Roof Surface"' <br />width dcpth* co:inc sand sand loamy sand sandy loam loam <br />I.S (t. I A ft. 0.7^_ 1.44 338 5.48 7.88 <br />I.5 ft. O.SG I.10 2.54 4.08 5.80 <br />�.o r�. o.as O.S9 2.0G 3.30 a.60 <br />'!.i ft. 0.39 0.75 1.72 2.76 3.84 <br />3.0 ft. 0.32 0.65 1.49 2.?8 3.28 <br />?.0 ft. I.0 (t. O.GO 1.19 2.68 43d 6.'!2 <br />� 1.5 ft. 0.47 0.92 2.0.1 �.28 4b? <br />'.i) tL 0.19 OJ6 LGG 2.bG 3.70 <br />�.i f�. O.i{ fi.GS IAI 2?G 3.10 <br />t.0 ft. 0.2� O.SG I.?3 1.9d 2.G8 <br />2.5 R. I.0 R. p.$ I 1.01 2.2d 3.Cri 5.14 <br />LS ft. 0.41 0.79 IJI 2JG 3.88 <br />2.0 ft. 0.3d O.G6 I.JO 2.'�v 3.IJ <br />2.9 ft. 0.'_9 O.SG 1.20 190 2.GG <br />i.0 (t. 0.'_ i O.d9 I.Oi I.GS 2.10 <br />3A ft. I.0 ft. 0.44 0.88 1.9? 3.10 dA0 <br />1.5 (t. 03G O.G9 1.47 2.?8 3.3G <br />2.Oft. 0?0 0.58 I.?I 1.94 2.74 <br />?.i ti. D.'S 0.50 I.Oa 1.65 232 <br />J.0 ft. 0.?? 0.4-1 0.91 1.43 2.00 <br />3.i ft. LO ft. 0.39 OJ8 I.GS ZJ_' 3.A8 <br />1.5 ft. 03? O.G? 1.29 2.08 2.96 <br />�.0 I't. 0?G 0.51 1.07 I.70 ? J2 <br />�S fl. O.Zi O.d4 0.9'_ I.dS 2.Oti <br />3.0 f�. 0?�) 0.39 0.81 I.?7 1.19 <br />d.0 ft I.0 ti. 0.3i OJO I'9 2.d' i..lG <br />I.$ �i. 0.?S 0.9i 1.15 I.85 2.66 <br />'.Oti. U'J O.d6 0.95 LS"_' _'.18 <br />'_.� ti. U.?0 G.aO 0 82 I 70 1.46 <br />3.Oft. 0.18 p.t5 0.73 1.13 L6= <br />' I)rpth rcicr. iu mc acptn u� ua>nca ro:r:, noi ac�m irom sun::cc <br />"Suil iccture. to br Jcicnnincd using ihc results of soil gradation Ics�s and thc USUA Tesmr:il Triangle. <br />I�,un��l��: :\n inliltra�ion trcn;h i 5(ect wide and 2 Icet Jecp, dug in sandy lu:un soils, for runolf from <br />a I�UU syu;�rc tlin� ronf. ��uidd ke �S,i 4:et lunc I�h;�rt �':�luo of 1.70 multiplicJ by I51. <br />i-?-10 <br />