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Tahlc 3-?.3 Rnof Runuff Di+persion System Sizing <br />Trench Jimensions Required Length of Trench per 100 square (ect of Roof Sur(ace•• <br />widlh dep�h' eoarsc sand � sand loatny sand sandy loam loam <br />I.5 ft. I.0 ft. O.dS 0.9? 2.?4 3.60 SJ(i <br />I.5 (t. 0.37 0.72 1.67 2.68 3.78 <br />2A fi. 0.29 0.59 13i 2.16 3.00 <br />2.5 ft. 0?i O.d9 I.13 I.80 2.50 <br />3A (t. 0.21 0.43 0.98 I.55 2.1d <br />2.0 fl. I.0 ft. 0.40 0.78 1.77 "_'.8G 4.0° <br />I.5 fi. 0.31 0.61 I.34 2.1 G 3.00 <br />2.0 ft. 0.25 0.50 1.09 i J4 2.42 <br />_'.5 ft. 0? I O.d2 0.93 1.47 2.4i <br />1.0 fL 0. I 8 037 0.81 I'7 I J4 <br />2.5 f�. I.0 fl. 0.3d O.G7 I.�18 2.�8 336 <br />I.5 ft. 0'6 OS2 1.13 I.dO 2.54 <br />?A fl. 0.]' 0.4i 0.92 1.46 2.�6 <br />2.5 ft. �.18 037 OJ9 I?d 1.73 <br />3.0 ft. 0.16 0.3'_ Q.G9 I.07 1.49 <br />±.0 fl. I A(i. 0?9 0.58 I.27 2.04 2.90 <br />I.i f�. 0.23 OA6 097 I.55 2.20 <br />2.Oft OJ9 0.?R 0.90 I?6 1.79 <br />Z.5 fl. 0.1G 0.3? 0.(id 1.07 I.51 <br />3.0 fl. O.Id 0.?3 0.60 0.91 1.31 <br />3.S ft. Lfi ft. 0.'6 0.51 I.I I 1.78 ?.56 <br />1.5 R. 0.20 0.40 0.85 1.3G 1.94 <br />? 0(t. 0.17 0.3d OJO I. I I 1.59 <br />2.g fl. O.Id U'9 f).GO 0.9�3 I.'.s <br />3.D!i. 0.1� 0.2` O.Si 0.�^_ 1.17 <br />i _ <br />d.011 LOfI. 0.21 Od6 0.99 I.i8 2.28 <br />I.5 (t. 0.18 0. ib 0.7G I 21 I J4 <br />?.Oli. O.li Q.10 0.63 0.99 1.43 <br />�.S tt. C.13 0?G 0.5d O.FJ I.�' <br />7.0 f i. 0. I I 0.23 0.�17 0.7 i I A6 <br />'Uc��lh re�crs tu �he Jep�h o� �vaSheJ roik. Out tlepth tront wrl:icC <br />'`ti�nl icshucs tn bc Jctcrmincd using thc resulls o( soil grad:�uon tcsts �nd thc USDA l�cxtural Triauglc. <br />If�.miplr: A Ji�persiun trcnch 3.i (ret wide and 2 Iett dcep, dug in sand,v loam .oils. for runuff Gum a <br />I i0U squ;irc fi�ot rni,(. �voulJ bc IG.6$ fcct lonc Ichan caluc of I. i I mulliplied by I S). <br />