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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 22 Summary for Reach 9R: East Swale Inflow Area = 6.227 ac, 0.63% Impervious, Inflow Depth = 0.43" for 1-yr event Inflow = 1.11 cfs @ 12.75 hrs, Volume= 0.222 af Outflow = 1.10 cfs @ 12.82 hrs, Volume= 0.222 af, Atten= 0%, Lag= 4.3 min Routed to Reach 8R : 15" Pipe Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs Max. Velocity= 2.04 fps, Min. Travel Time= 3.8 min Avg. Velocity = 0.99 fps, Avg. Travel Time= 7.8 min Peak Storage= 249 cf @ 12.82 hrs Average Depth at Peak Storage= 0.21' , Surface Width= 3.24' Bank-Full Depth= 3.00' Flow Area= 33.0 sf, Capacity= 303.17 cfs 2.00' x 3.00' deep channel, n= 0.022 Earth, clean & straight Side Slope Z-value= 3.0 '/' Top Width= 20.00' Length= 460.0' Slope= 0.0101 '/' Inlet Invert= 599.00', Outlet Invert= 594.35' Reach 9R: East Swale Hydrograph Inflow 1.11 cfs Outflow 1.10 cfs Inflow Area=6.227 ac 1 Avg. Flow Depth=0.21' Max Vel=2.04 fps n=0.022 Flow (cfs) L=460.0' S=0.0101 '/' Capacity=303.17 cfs 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 489 of 1174