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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 25-yr Rainfall=3.84" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 58 Primary OutFlow Max=0.04 cfs @ 12.28 hrs HW=596.11' TW=0.00' (Dynamic Tailwater) 1=Exfiltration Through Media (Exfiltration Controls 0.04 cfs) Secondary OutFlow Max=0.99 cfs @ 12.28 hrs HW=596.11' TW=0.00' (Dynamic Tailwater) 3=Culvert (Passes 0.99 cfs of 6.00 cfs potential flow) 2=Overflow Grate (Weir Controls 0.99 cfs @ 1.10 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 3.24 cfs Outflow Inflow Area=0.743 ac Primary Secondary Tertiary Peak Elev=596.11' 3 Storage=3,881 cf Flow (cfs) 2 1.03 cfs 0.99 cfs 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 525 of 1174