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ROCK DOG #1 PIT 12/20/05 by MRC <br />Preliminary Drainaoe Assessment -Summary. <br />The following sumarizes the basis for calculating the rapacity of the Detention Pond shown on Exhibit C <br />in Permit Application File # M- 2005-045. <br />Detention of stormwater within Phases D and E will be managed such that no discharge occurs. <br />A more formal drainage analysis is currently under way in the preparation of a stormwater Management Plan. <br />A copy of this plan will be submittetl to CODMG when completed and accepted by the Coloratlo Department of Health <br />Water Quality Control Division. <br />O =Flaw, C = Runff Coefficient, I =Intensity, A =Area <br />Runoff Historic <br />Total Site Area 1 (Phases A, B and C) 53.9 Ac. <br />Runoff Coefficient (Overland -Assume Heavy Soils ~ 1-5°~ Slp) <br />100 % Pervious ~ 0.30 <br />Coo = 0.30 x 1.25 = 0.375 <br />O cfs =CIA = (.375) (5.4) (53.9 Ac.) = 109.1 ds <br />O vol (cf) =CIA = (.375) (2.2/12) (2.348mS.F.) = 161.425 ct [> 7.17 h deep @ 150' squaretlj <br />Detention Pondina Capacity <br />Proposed depth of pond = 6.5 <br />Surface Area ($A), then is (161,425 ct / 6.5) 24.835 sf <br />[I.e: (SA)'n = 157.6 8] <br />