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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 21 Reach 8R: 15" Pipe Hydrograph Inflow 1.10 cfs Outflow Overflow 1.10 cfs Inflow Area=6.227 ac Avg. Flow Depth=0.35' 1 Max Vel=3.87 fps 15.0" Round Pipe Flow (cfs) n=0.013 L=350.0' S=0.0096 '/' Capacity=6.33 cfs 0.00 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 488 of 1174