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23-4121 storm calcs - Proposed Type II 24-hr 1-Year Rainfall=1.87" Prepared by Carmina Wood Design Printed 5/14/2026 HydroCAD® 10.20-8a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 7 Time span=0.50-70.00 hrs, dt=0.04 hrs, 1739 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Stor-Ind+Trans method - Pond routing by Stor-Ind method Subcatchment 1S: Proposed - North Runoff Area=159,502 sf 51.54% Impervious Runoff Depth=0.92" Flow Length=738' Tc=24.8 min CN=89 Runoff=3.28 cfs 12,245 cf Subcatchment 2S: Proposed - South Runoff Area=93,939 sf 49.41% Impervious Runoff Depth=0.92" Flow Length=627' Tc=19.8 min CN=89 Runoff=2.21 cfs 7,211 cf Subcatchment 3S: Direct Runoff Area=21,732 sf 0.00% Impervious Runoff Depth=0.48" Flow Length=58' Tc=7.8 min CN=80 Runoff=0.38 cfs 878 cf Pond 1P: Detention Pond Peak Elev=671.04' Storage=5,335 cf Inflow=5.40 cfs 19,456 cf Outflow=1.94 cfs 19,456 cf Total Runoff Area = 275,173 sf Runoff Volume = 20,334 cf Average Runoff Depth = 0.89" 53.25% Pervious = 146,543 sf 46.75% Impervious = 128,630 sf Page 529 of 849