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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 100-yr Rainfall=5.22" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 74 Summary for Reach 8R: 15" Pipe [52] Hint: Inlet/Outlet conditions not evaluated Inflow Area = 6.227 ac, 0.63% Impervious, Inflow Depth = 3.01" for 100-yr event Inflow = 9.63 cfs @ 12.74 hrs, Volume= 1.562 af Outflow = 6.33 cfs @ 12.83 hrs, Volume= 1.405 af, Atten= 34%, Lag= 5.6 min Routed to Reach DP-1 : Design Point Overflow = 3.30 cfs @ 12.74 hrs, Volume= 0.157 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= 5.88 fps, Min. Travel Time= 1.0 min Avg. Velocity = 2.74 fps, Avg. Travel Time= 2.1 min Peak Storage= 377 cf @ 12.83 hrs Average Depth at Peak Storage= 1.02' , Surface Width= 0.96' 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 541 of 1174