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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 25 Primary OutFlow Max=0.01 cfs @ 17.73 hrs HW=598.47' TW=0.00' (Dynamic Tailwater) 1=Exfiltration Through Media (Exfiltration Controls 0.01 cfs) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=594.42' TW=0.00' (Dynamic Tailwater) 3=Culvert ( Controls 0.00 cfs) 2=Overflow Grate ( Controls 0.00 cfs) 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 0.52 cfs Outflow Inflow Area=0.418 ac Primary Secondary Tertiary 0.55 Peak Elev=598.47' 0.5 Storage=780 cf 0.45 0.4 0.35 Flow (cfs) 0.3 0.25 0.2 0.15 0.01 cfs 0.1 0.01 cfs 0.05 0.00 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 492 of 1174