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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 85 Primary OutFlow Max=0.04 cfs @ 12.10 hrs HW=596.25' TW=0.00' (Dynamic Tailwater) 1=Exfiltration Through Media (Exfiltration Controls 0.04 cfs) Secondary OutFlow Max=3.19 cfs @ 12.10 hrs HW=596.25' TW=0.00' (Dynamic Tailwater) 3=Culvert (Passes 3.19 cfs of 6.09 cfs potential flow) 2=Overflow Grate (Weir Controls 3.19 cfs @ 1.62 fps) Tertiary OutFlow Max=0.00 cfs @ 0.00 hrs HW=591.42' TW=0.00' (Dynamic Tailwater) 4=Emergency Overflow Weir ( Controls 0.00 cfs) Pond BIO-3: Filtration Bioretention Hydrograph Inflow 4.57 cfs Outflow Inflow Area=0.743 ac Primary Secondary Tertiary 5 Peak Elev=596.25' 3.24 cfs Storage=4,357 cf 4 3.20 cfs 3 Flow (cfs) 2 1 0.04 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 552 of 1174