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23-4121 storm calcs - Existing 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 10 Summary for Subcatchment 1S: Existing - North Runoff = 4.98 cfs @ 12.23 hrs, Volume= 20,479 cf, Depth= 1.36" 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 10-Year Rainfall=3.14" Area (sf) CN Description 131,812 80 Pasture/grassland/range, Good, HSG D 49,422 79 Woods/grass comb., Good, HSG D 181,234 80 Weighted Average 181,234 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 16.9 150 0.0400 0.15 Sheet Flow, Grass: Dense n= 0.240 P2= 2.50" 5.2 287 0.0170 0.91 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 4.0 284 0.0280 1.17 Shallow Concentrated Flow, Short Grass Pasture Kv= 7.0 fps 2.1 85 0.0180 0.67 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 28.2 806 Total Subcatchment 1S: Existing - North Hydrograph Runoff 4.98 cfs 5 Type II 24-hr 10-Year Rainfall=3.14" 4 Runoff Area=181,234 sf Runoff Volume=20,479 cf Flow (cfs) 3 Runoff Depth=1.36" Flow Length=806' 2 Tc=28.2 min CN=80 1 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 Time (hours) Page 515 of 849