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WNY-2500056.00_HydroCAD extreme_precip_tables_output (29) 24-hr S1 1-yr Rainfall=1.88" Prepared by Greenman-Pedersen, Inc Printed 12/18/2025 HydroCAD® 10.20-7a s/n 04560 © 2025 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment DA 3: Drainage Area 3 Runoff = 0.33 cfs @ 12.05 hrs, Volume= 0.019 af, Depth> 1.55" Routed to Pond RCVR 3 : RCVR 3 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-24.00 hrs, dt= 0.05 hrs extreme_precip_tables_output (29) 24-hr S1 1-yr Rainfall=1.88" Area (ac) CN Description 0.140 98 Paved parking, HSG D 0.010 80 >75% Grass cover, Good, HSG D 0.150 97 Weighted Average 0.010 6.67% Pervious Area 0.140 93.33% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 19 0.0100 0.05 Sheet Flow, Grass: Dense n= 0.240 P2= 2.20" 1.2 56 0.0100 0.77 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.20" 7.2 75 Total Subcatchment DA 3: Drainage Area 3