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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 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 23 Summary for Reach DP-1: Design Point [40] Hint: Not Described (Outflow=Inflow) Inflow Area = 16.122 ac, 18.93% Impervious, Inflow Depth > 0.60" for 1-yr event Inflow = 2.94 cfs @ 12.18 hrs, Volume= 0.810 af Outflow = 2.94 cfs @ 12.18 hrs, Volume= 0.810 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Reach DP-1: Design Point Hydrograph Inflow 2.94 cfs Outflow 3 2.94 cfs Inflow Area=16.122 ac 2 Flow (cfs) 1 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 490 of 1174