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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 20 Summary for Reach 8R: 15" Pipe [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 6.227 ac, 0.63% Impervious, Inflow Depth = 0.43" for 1-yr event Inflow = 1.10 cfs @ 12.82 hrs, Volume= 0.222 af Outflow = 1.10 cfs @ 12.84 hrs, Volume= 0.222 af, Atten= 0%, Lag= 1.1 min Routed to Reach DP-1 : Design Point Overflow = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af Routed to Reach DP-1 : Design Point Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Max. Velocity= 3.87 fps, Min. Travel Time= 1.5 min Avg. Velocity = 1.88 fps, Avg. Travel Time= 3.1 min Peak Storage= 100 cf @ 12.84 hrs Average Depth at Peak Storage= 0.35' , Surface Width= 1.13' Defined Flood Depth= 598.00' Flow Area= 100.4 sf, Capacity= -12,672.78 cfs Bank-Full Depth= 1.25' Flow Area= 1.2 sf, Capacity= 6.33 cfs Any excess flow will be diverted to the secondary overflow 15.0" Round Pipe n= 0.013 Corrugated PE, smooth interior Length= 350.0' Slope= 0.0096 '/' Inlet Invert= 591.85', Outlet Invert= 588.49' Page 487 of 1174