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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 52 Primary OutFlow Max=0.02 cfs @ 12.19 hrs HW=599.09' TW=0.00' (Dynamic Tailwater) 1=Exfiltration Through Media (Exfiltration Controls 0.02 cfs) Secondary OutFlow Max=0.69 cfs @ 12.19 hrs HW=599.09' TW=0.00' (Dynamic Tailwater) 3=Culvert (Passes 0.69 cfs of 5.98 cfs potential flow) 2=Overflow Grate (Weir Controls 0.69 cfs @ 0.98 fps) Tertiary OutFlow Max=0.00 cfs @ 0.00 hrs HW=594.42' TW=0.00' (Dynamic Tailwater) 4=Emergency Overflow Weir ( Controls 0.00 cfs) Pond BIO-1: Filtration Bioretention Hydrograph Inflow 1.57 cfs Outflow Inflow Area=0.418 ac Primary Secondary Tertiary Peak Elev=599.09' Storage=1,543 cf 0.71 cfs Flow (cfs) 1 0.69 cfs 0.02 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 519 of 1174