SW6211001_Design Calculations (DA, Pond 2)_20220128

Wayside Apartments Required Storm Volume
Pond #2
Drainage Area:
273,849 sf (6.29 acres)
Impervious Area: 169,858 sf (3.90 ac)
Impervious: 62.0%
1 inch Storm Event:
Rv = 0.05+0.009 1
Rv = runoff coefficient
1= percent impervious
Rv=0.05+0.009*62.0%
= 0.608
For volume that must be controlled:
Volume=3,630*Rd*Rv*A
Volume = 3,630*(1 inch)*(0.608)*6.29 acres = 13,882 cf
SA/DA ratio is 2.17 for a depth of 3 feet
Required surface area = 6.29 ac * (0.0217) = 0.136 ac or 5,924 sf
Surface area provided = 37,327 sf
409 Chicago Drive, Suite 112, FayetteviIle. NC 28306
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