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Rustys_Post-Construction - Copy Type II 24-hr 25-yr Rainfall=3.84" Prepared by Waves AE Printed 7/29/2026 HydroCAD® 10.20-7a s/n 13900 © 2025 HydroCAD Software Solutions LLC Page 11 Summary for Subcatchment 4: Subcat 4 Runoff = 0.22 cfs @ 11.96 hrs, Volume= 500 cf, Depth> 3.24" Routed to Pond 1P : INFIL. BED Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs Type II 24-hr 25-yr Rainfall=3.84" Area (sf) CN Description 38 73 Brush, Good, HSG D 1,814 98 Paved parking, HSG D 1,852 97 Weighted Average 38 2.03% Pervious Area 1,814 97.97% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, Subcatchment 4: Subcat 4 Hydrograph Runoff 0.24 0.22 cfs 0.23 0.22 0.21 Type II 24-hr 0.2 0.19 25-yr Rainfall=3.84" 0.18 0.17 0.16 Runoff Area=1,852 sf 0.15 Runoff Volume=500 cf Flow (cfs) 0.14 0.13 0.12 Runoff Depth>3.24" 0.11 0.1 0.09 Tc=6.0 min 0.08 0.07 CN=97 0.06 0.05 0.04 0.03 0.02 0.01 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Page 72 of 84