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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 25-yr Rainfall=3.84" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 47 Summary for Reach 8R: 15" Pipe [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 6.227 ac, 0.63% Impervious, Inflow Depth = 1.85" for 25-yr event Inflow = 5.71 cfs @ 12.75 hrs, Volume= 0.960 af Outflow = 5.70 cfs @ 12.76 hrs, Volume= 0.960 af, Atten= 0%, Lag= 0.7 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= 5.84 fps, Min. Travel Time= 1.0 min Avg. Velocity = 2.52 fps, Avg. Travel Time= 2.3 min Peak Storage= 342 cf @ 12.76 hrs Average Depth at Peak Storage= 0.93' , Surface Width= 1.09' 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 514 of 1174