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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 12 Summary for Subcatchment 3S: Direct Runoff = 0.38 cfs @ 12.00 hrs, Volume= 878 cf, Depth= 0.48" 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 1-Year Rainfall=1.87" 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 0.42 Runoff 0.4 0.38 cfs 0.38 0.36 Type II 24-hr 0.34 0.32 1-Year Rainfall=1.87" 0.3 0.28 Runoff Area=21,732 sf 0.26 Runoff Volume=878 cf Flow (cfs) 0.24 0.22 0.2 Runoff Depth=0.48" 0.18 0.16 Flow Length=58' 0.14 0.12 Tc=7.8 min 0.1 0.08 CN=80 0.06 0.04 0.02 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hours) Page 534 of 849