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DETENTION REQUIREN�NT CALCULATIONS <br /> ExistinQ Conditior.s: <br /> Impervious: Asphalt a 14 x 94 <br /> Duplax/Cancrete � 30 x 36 <br /> 31 x 21 <br /> s 0.054 acre <br /> Gravel: a(5 •51 �/4 <br /> 43 x 52 @ 0.088 acre <br /> Grass/Landscaping: <br /> 26,550 - total of all other areas = 0.166 acre � <br /> Woods/Forest: 90 x 90 <br /> 60x 90x �f <br /> 35x 25x �i <br /> 35 x 55 Q 0.302 acre <br /> Woods/Forest - 40$ (averaqe alope) : <br /> (0.320 - 0.265) / (20.0 - 10.0) <br /> _ (x - 0.320) / (40.0 - 20.0) <br /> x = 0.430 <br /> Total Allowable Release = 0.349 cfs <br /> 0.349 cfs/0. 610 ac � 0.572 cfs/9^re <br /> Lawns/Landacapinq - 408 (averaqe slope) : <br /> Use to Interpolate area of Scotch broom/blackberriea) <br /> (0.63 - 0.51) / (20.0 - 10.0) <br /> a (x - 0.63) / (40.0 - 20.0) <br /> x = 0.870 <br /> 4 Averaqe cfs/acre for thia area <br /> (0.43 + 0.87) /2 = 0.650 <br /> Use 0. 650 for steep alopinq natural area <br /> Developed Conditione: <br /> Lawns/Landscapinq = 0.103 <br /> Impervious = 0. 610 - (0.103 + 0.065) <br /> = 0.441 acre <br /> Natural - � 0. 066 acre <br /> Impervious (1693 - 607) / (0.40 - 0.70) <br /> _ (1693 - x) / (0.40 - 0.687) <br /> x a 672 cf/acre <br /> Detention = 672 x 0.441 � 296 cf <br />