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23-4121 storm calcs - Proposed Type II 24-hr 10-Year Rainfall=3.14" Prepared by Carmina Wood Design Printed 5/14/2026 HydroCAD® 10.20-8a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 15 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=2.03" Flow Length=738' Tc=24.8 min CN=89 Runoff=7.22 cfs 26,940 cf Subcatchment 2S: Proposed - South Runoff Area=93,939 sf 49.41% Impervious Runoff Depth=2.03" Flow Length=627' Tc=19.8 min CN=89 Runoff=4.85 cfs 15,867 cf Subcatchment 3S: Direct Runoff Area=21,732 sf 0.00% Impervious Runoff Depth=1.36" Flow Length=58' Tc=7.8 min CN=80 Runoff=1.12 cfs 2,456 cf Pond 1P: Detention Pond Peak Elev=672.95' Storage=15,013 cf Inflow=11.90 cfs 42,807 cf Outflow=2.82 cfs 42,807 cf Total Runoff Area = 275,173 sf Runoff Volume = 45,263 cf Average Runoff Depth = 1.97" 53.25% Pervious = 146,543 sf 46.75% Impervious = 128,630 sf Page 537 of 849