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84 <br /> USUMMIT <br /> DESIGN AND ENGINEERING SERVICES <br /> Project: LRD Date: 12.2.2022 Revision: <br /> Project No: 22-0214 By: WRW <br /> Drainage Area 1 <br /> Input values in red <br /> W Drainage Area Pervious Surface Area <br /> Total Drainage Area (sf) 1,741,421 Manage Pervious Area sf 0 <br /> On-site Drainage Area (sf) 1,741,421 Unmanged Pervious Area (pasture) (sf) 0 <br /> Off-site Drainage Area (sf) 0 Forest(sf) 0 <br /> Total Pervious Area (sf) 0 <br /> Impervious Surface Area <br /> On-site Buildings/Lots (sf) 113,226 <br /> On-site Streets (sf) 83,649 <br /> On-site Parking (sf) <br /> On-site Sidewalks (sf) <br /> Other On-site (sf) <br /> Future (sf) 0 <br /> Off-site (sf) 0 <br /> Existing BUA* (sf) 0 *=Report only amount of existing BUA that will remain after development. Do not report <br /> Total Impervious Area (sf) 196,875 any existing BUA that is to be removed and which will be replaced by new BUA <br /> Required Surface Area Required Storage for 1st inch of runoff <br /> Total Drainage Area = 39.98 ac Simple Method <br /> Total Impervious Area = 4.52 ac <br /> Percent Impervious = 11.31% Rv = 0.05 + 0.009(I) <br /> Design Rainfall Depth = 1 in I = % impervious = 11% <br /> Average Perm. Pool Depth = 3.37 ft <br /> Max. Perm. Pool Depth = 3.5 ft <br /> SA/DA Ratio = 0.52 Rv = 0.15 in <br /> Surface Area Required = 9057 sf Volume = 22022 cf <br /> 0.21 ac <br /> Calculation Methods are taken from NCDEQ Stormwater Minimum Design Criteria,Latest Version <br /> Surface Area -• -• at NormalPool 9,057 sf <br /> Temporary • .•- Volume Required 22,022 <br /> Page 1 of 4 <br />