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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 13 Summary for Subcatchment ASP: Area to Southern Property Runoff = 0.06 cfs @ 12.35 hrs, Volume= 0.007 af, Depth> 0.49" Routed to Link PRE : Pre-Development 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 0.170 80 >75% Grass cover, Good, HSG D 0.170 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 25.4 135 0.0138 0.09 Sheet Flow, Grass: Dense n= 0.240 P2= 2.20" Subcatchment ASP: Area to Southern Property