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D_App D_Pre-Development Model NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Prepared by Labella Associates Printed 4/17/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 7 Summary for Subcatchment ES-2: E Site Runoff = 1.42 cfs @ 12.25 hrs, Volume= 0.139 af, Depth= 0.49" Routed to Reach AP-1 : Cayuga Creek Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Area (sf) CN Description 7,764 98 Paved parking, HSG D 139,294 80 >75% Grass cover, Good, HSG D 147,058 81 Weighted Average 139,294 94.72% Pervious Area 7,764 5.28% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.3 100 0.0150 0.13 Sheet Flow, SF Grass: Short n= 0.150 P2= 2.20" 6.1 290 0.0130 0.80 Shallow Concentrated Flow, SCF Short Grass Pasture Kv= 7.0 fps 19.4 390 Total Subcatchment ES-2: E Site Hydrograph Runoff 1.42 cfs NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Runoff Area=147,058 sf Runoff Volume=0.139 af 1 Runoff Depth=0.49" Flow (cfs) Flow Length=390' Tc=19.4 min CN=81 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours) Page 183 of 359