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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 10 Summary for Subcatchment AQR: Area to Quaker Road Runoff = 0.24 cfs @ 12.06 hrs, Volume= 0.014 af, Depth> 1.28" 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 0.100 98 Paved parking, HSG D 0.030 80 >75% Grass cover, Good, HSG D 0.130 94 Weighted Average 0.030 23.08% Pervious Area 0.100 76.92% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 3.3 18 0.0408 0.09 Sheet Flow, Grass: Dense n= 0.240 P2= 2.20" 0.7 37 0.0196 0.93 Sheet Flow, Smooth surfaces n= 0.011 P2= 2.20" 4.0 24 0.0429 0.10 Sheet Flow, Grass: Dense n= 0.240 P2= 2.20" 8.0 79 Total Subcatchment AQR: Area to Quaker Road