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• <br />u <br />• <br />-- ------ - - - - -- <br />Area <br />soil <br />(acres) <br />Group <br />CN <br />Soil /Surface Description <br />-- --- <br />- - - - -- <br />-------------------------- <br />2.21 <br />D <br />71.00 <br />Pinyon & Juniper range, Good <br />0.04 <br />D <br />89.00 <br />Dirt roads <br />2.25 <br />71.36 <br />Composite Area & Weighted CN <br />- ----- -- - - - - -- <br />Subbasin Sub -a3 <br />___ _______ ____ <br />Area <br />soil <br />(acres) <br />Group <br />Soil /Surface Description <br />-- <br />- - - -- - - - - <br />-- - <br />_- ___ - -C- <br />--------------------- - <br />-------------------------------------------------- <br />-------------- - --------- <br />13.50 <br />13.50 <br />D <br />71.00 <br />Pinyon & Juniper range, Good <br />0.28 <br />D <br />89.00 <br />Dirt roads <br />13.78 <br />71.36 <br />Composite Area & Weighted CN <br />' <br />Subbasin Sub -bl <br />--- ----- - - - - -- <br />A rea <br />Soil <br />(acres) <br />CN <br />Soil /Surface Description <br />- - - - -- - 1.39 <br />_-Group <br />- ----------- <br />------ ---------------------------------------- <br />--------------------- ------- <br />1.39 <br />D <br />71.00 <br />Pinyon & Juniper range, Good <br />1.39 <br />71.00 <br />Composite Area & Weighted CN <br />-------- - - - - -- <br />Subbasin Sub -c <br />-------- - - - - -- <br />Area <br />Soil <br />Soil /Surface Description <br />------- <br />-------- <br />(acres) <br />---------------------- <br />Group <br />N <br />----------------------------- ------------------- <br />5.13 <br />D <br />94.00 <br />Newly graded area <br />5.13 <br />94.00 <br />Composite Area & Weighted CN <br />Subbasin Sub -d <br />-------- - - -- -- <br />Area <br />Soil <br />Soil /Surface Description <br />------- <br />(acres) <br />-------- <br />Group <br />Group <br />CN <br />______ <br />----------------------------- -------- ------------------- <br />D <br />94.00 <br />Newly graded area <br />20.68 <br />94.00 <br />Composite Area & Weighted CN <br />EPA SWMM Time of Concentration Computations Report <br />Tc = (0.94 * (L ^0.6) * (n ^0.6)) / ((i ^0.4) <br />* (S ^0.3)) <br />Where: <br />Tc = Time of Concentration (min) <br />L = Flow Length (ft) <br />n = Manning's Roughness <br />i = Rainfall Intensity (in /hr) <br />S = Slope (ft /ft) <br />-------- - - - - -- <br />Subbasin Sub -al <br />Flow length (ft): <br />534.51 <br />0.60000 <br />Pervious Manning's Roughness: <br />0.01000 <br />Impervious Manning's Roughness: <br />Autodesk Storm and Sanitary AnalysiS <br />Page E 19(15) <br />-442 <br />Revised 11 /2/10 <br />TR 54 <br />