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23-4121 storm calcs - Existing 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 8 Summary for Subcatchment 2S: Existing - South Runoff = 1.04 cfs @ 12.15 hrs, Volume= 3,797 cf, Depth= 0.48" Routed to nonexistent node 6L 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 93,939 80 Pasture/grassland/range, Good, HSG D 93,939 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 17.5 150 0.0370 0.14 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 2.6 212 0.0370 1.35 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 20.1 362 Total Subcatchment 2S: Existing - South Hydrograph Runoff 1.04 cfs 1 Type II 24-hr 1-Year Rainfall=1.87" Runoff Area=93,939 sf Runoff Volume=3,797 cf Flow (cfs) Runoff Depth=0.48" Flow Length=362' Slope=0.0370 '/' Tc=20.1 min CN=80 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hours) Page 513 of 849