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D_App D_Pre-Development Model NY-West Seneca 24-hr S1 100-yr Rainfall=5.22" Prepared by Labella Associates Printed 4/17/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 13 Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment ES-1: W Site Runoff Area=337,194 sf 11.34% Impervious Runoff Depth=3.28" Flow Length=391' Tc=14.0 min CN=82 Runoff=27.59 cfs 2.114 af Subcatchment ES-2: E Site Runoff Area=147,058 sf 5.28% Impervious Runoff Depth=3.18" Flow Length=390' Tc=19.4 min CN=81 Runoff=10.17 cfs 0.895 af Reach AP-1: Cayuga Creek Inflow=36.80 cfs 3.008 af Outflow=36.80 cfs 3.008 af Total Runoff Area = 11.117 ac Runoff Volume = 3.008 af Average Runoff Depth = 3.25" 90.50% Pervious = 10.061 ac 9.50% Impervious = 1.056 ac Page 189 of 359