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<br />rl <br />[1 <br />IJ <br />f1 <br />rJ <br />fl <br />(] <br />U <br />n <br />U <br />II <br />/I <br />U <br />l.I <br />l J <br />11 <br />[ I <br />1. ) <br />II <br /> <br />BELLA VISTA PARK <br />Page 2 of 2 <br /> <br />Volume shall be treated = 0.028 Ac.-Ft. (2.5 inchS time Dercentaae <br />imperviousness) <br /> <br />Len9th of trench required for treatment 0.0385 Ac.- Ft. (L 1 . <br /> <br />Per South Florida Water Management District when the saturated depth of <br />trench is greater than the non- saturated depth of trench, a conservative <br />exfiltration trench design formula is: <br /> <br />L = V I [k (2 H2 Du-Du2+2 H2 Ds) +0.000139WDu] <br /> <br />L = length of trench required (Feet) <br />V = volume to be treated (Acre-Inches) <br />W= trench width (Feet) <br />K = hydraulic conductivity (CfsjFt,2-Ft.Head) <br />H = trench depth (Feet) <br />H2= depth to water table (Feet) <br />Du= non-saturated trench depth (Feet) <br />Os= saturated trench depth (Feet) <br /> <br />Where: <br />V = 0.039 AC.-Ft, x 12 = 0.468 AC.-In. <br />W = 3.0 Ft. <br />K (Avg) =1.88x 10-4 CfsjFt.2-Ft.Head <br />H = H2 + Ds = 15 Ft <br />H2 = 0.9 Ft. <br />Du = 0.0 Ft. <br />Ds = 14,1 Ft. <br /> <br />L=0.468j [0.000188(2XO,9XO,O - 0,02 + 2XO.9X14,1) <br />+ 0.000139 X 3 X 0.0] <br />L = 98 Ft, <br /> <br />Lenath of Trench Reauired For Water Quality L = 98 Ft. <br /> <br />Length of Trench Required For Water Quality L = 147 Ft. <br />(1500/0) <br /> <br />Length of Trench Proyided L = 160 Ft. <br /> <br />" r .,< (1' ",.' '1 f.' <br />. "l}. .~~ ) l \ ~ <br />jf;: ....:. /". . .'t <br />._A.. Y \ ",\' <br />;::'~ ~,,; -' }>. )) j <br /> <br />LtHlfNE:.E:I1ING ..iC <br />