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23-4121 storm calcs - Proposed Type II 24-hr 25-Year Rainfall=3.84" Prepared by Carmina Wood Design Printed 5/14/2026 HydroCAD® 10.20-8a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 28 Summary for Subcatchment 3S: Direct Runoff = 1.57 cfs @ 11.99 hrs, Volume= 3,459 cf, Depth= 1.91" Routed to nonexistent node 2P 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 25-Year Rainfall=3.84" Area (sf) CN Description 21,732 80 >75% Grass cover, Good, HSG D 21,732 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.4 10 0.0100 0.05 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 4.4 48 0.1200 0.18 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 7.8 58 Total Subcatchment 3S: Direct Hydrograph Runoff 1.57 cfs Type II 24-hr 25-Year Rainfall=3.84" Runoff Area=21,732 sf Runoff Volume=3,459 cf Flow (cfs) 1 Runoff Depth=1.91" Flow Length=58' Tc=7.8 min CN=80 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hours) Page 550 of 849