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E_App E_Post-Development Model NY-West Seneca 24-hr S1 100-yr Rainfall=5.22" Prepared by Labella Associates Printed 4/20/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 61 Pond CH-1: Chambers Hydrograph Inflow 15 13.65 cfs Primary 14 Inflow Area=2.091 ac 13 12 Peak Elev=594.85' 11 Storage=0.322 af 10 9 8.0" Flow (cfs) 8 Round Culvert 7 n=0.013 6 5 L=25.0' 4 2.40 cfs S=0.0100 '/' 3 2 1 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 261 of 1493