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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 13 Summary for Subcatchment 6: Subcat 6 [46] Hint: Tc=0 (Instant runoff peak depends on dt) Runoff = 0.48 cfs @ 11.89 hrs, Volume= 940 cf, Depth> 3.32" Routed to Pond 4P : INFIL. BED SAND 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 3 73 Brush, Good, HSG D 3,363 98 Paved parking, HSG D 27 98 Unconnected pavement, HSG D 3,392 98 Weighted Average 3 0.09% Pervious Area 3,389 99.91% Impervious Area 27 0.79% Unconnected Subcatchment 6: Subcat 6 Hydrograph Runoff 0.5 0.48 cfs 0.45 Type II 24-hr 0.4 25-yr Rainfall=3.84" 0.35 Runoff Area=3,392 sf Runoff Volume=940 cf Flow (cfs) 0.3 0.25 Runoff Depth>3.32" 0.2 Tc=0.0 min 0.15 CN=98 0.1 0.05 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) Page 74 of 84