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WEST SENECA - PRE DEVELOPMENT D_App D_Pre-Development Model_REV 1 NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 7 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=0.53" Flow Length=391' Tc=14.0 min CN=82 Runoff=4.22 cfs 0.344 af Subcatchment ES-2: E Site Runoff Area=147,058 sf 5.28% Impervious Runoff Depth=0.49" Flow Length=390' Tc=19.4 min CN=81 Runoff=1.42 cfs 0.139 af Subcatchment ES-3: OFF-SITE DRAINAGE Runoff Area=218,018 sf 0.26% Impervious Runoff Depth=0.42" Flow Length=832' Slope=0.0100 '/' Tc=58.6 min CN=79 Runoff=0.93 cfs 0.175 af Reach AP-1: Cayuga Creek Inflow=5.58 cfs 0.658 af Outflow=5.58 cfs 0.658 af Total Runoff Area = 16.122 ac Runoff Volume = 0.658 af Average Runoff Depth = 0.49" 93.37% Pervious = 15.053 ac 6.63% Impervious = 1.069 ac Page 450 of 1174