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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 16 Summary for Subcatchment 1S: Proposed - North [47] Hint: Peak is 1821% of capacity of segment #3 [47] Hint: Peak is 242% of capacity of segment #4 [47] Hint: Peak is 203% of capacity of segment #5 Runoff = 7.22 cfs @ 12.18 hrs, Volume= 26,940 cf, Depth= 2.03" Routed to Pond 1P : Detention Pond Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.50-70.02 hrs, dt= 0.04 hrs Type II 24-hr 10-Year Rainfall=3.14" Area (sf) CN Description 32,787 98 Roofs, HSG D 45,906 98 Paved parking, HSG D * 3,518 98 Sidewalk, HSG D 77,291 80 >75% Grass cover, Good, HSG D 159,502 89 Weighted Average 77,291 48.46% Pervious Area 82,211 51.54% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.4 21 0.0090 0.05 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 15.1 65 0.0100 0.07 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 1.5 182 0.0050 2.02 0.40 Pipe Channel, 6" @ 0.5% 6.0" Round Area= 0.2 sf Perim= 1.6' r= 0.13' n= 0.013 Corrugated PE, smooth interior 0.3 70 0.0070 3.80 2.98 Pipe Channel, 12" @ 0.7% 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 1.5 400 0.0100 4.54 3.56 Pipe Channel, 12" @ 1.0% 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 24.8 738 Total Page 538 of 849