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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 10 Summary for Subcatchment 2S: Proposed - South [47] Hint: Peak is 258% of capacity of segment #3 Runoff = 2.21 cfs @ 12.13 hrs, Volume= 7,211 cf, Depth= 0.92" 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 1-Year Rainfall=1.87" Area (sf) CN Description 22,791 98 Roofs, HSG D 22,002 98 Paved parking, HSG D * 1,626 98 Concrete, HSG D 47,520 80 >75% Grass cover, Good, HSG D 93,939 89 Weighted Average 47,520 50.59% Pervious Area 46,419 49.41% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 1.4 10 0.0900 0.12 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 15.6 43 0.0040 0.05 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 1.3 194 0.0050 2.45 0.85 Pipe Channel, 8" @ 0.5% 8.0" Round Area= 0.3 sf Perim= 2.1' r= 0.17' n= 0.013 Corrugated PE, smooth interior 0.9 209 0.0080 4.06 3.19 Pipe Channel, 12" @ 0.8% 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 0.6 171 0.0110 4.76 3.74 Pipe Channel, 12" @ 1.1% 12.0" Round Area= 0.8 sf Perim= 3.1' r= 0.25' n= 0.013 Corrugated PE, smooth interior 19.8 627 Total Page 532 of 849