SW6210205_Vol required_20210310

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Springy Lake Ray Rd Dollar General Required Storm Volume
solutions
civil engineering I land surveying
Wet Pond
Drainage Area:
1.58 acres (68,825 sf)
Impervious Area: 47,944 sf (1.10 ac)
Impervious: 70%
1 inch Storm Event:
Rv = 0.05+0.009 1
Rv = runoff coefficient
1= percent impervious
Rv=0.05+0.009*70.0%
For volume that must be controlled:
Volume=3,630*Rd*Rv*A
Volume = 3,630*(1 inch)*(0.6800)*1.58 acres = 3,900 cf
Temporary volume stored = 8,185 cf
SA/DA ratio is 2.51 for a depth of 3.0 feet
Required surface area = 1.58 ac * (0.0251) = 0.039658 ac or 1,728 sf
Surface area provided (main permanent pool) = 5,791 sf
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