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24-4113 WEST SENECA EXCAHNGE NY-WestSeneca_NOAA14 24-hr S1 1-yr Rainfall=1.87" Prepared by Carmina Wood Design Printed 7/13/2026 HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 20 Summary for Link 12L: COSTCO Inflow Area = 21.223 ac, 78.41% Impervious, Inflow Depth = 1.30" for 1-yr event Inflow = 46.67 cfs @ 12.03 hrs, Volume= 2.301 af Primary = 46.67 cfs @ 12.03 hrs, Volume= 2.301 af, Atten= 0%, Lag= 0.0 min Routed to Pond 18P : POND Primary outflow = Inflow, Time Span= 0.00-150.00 hrs, dt= 0.01 hrs 1-yr Primary Outflow Imported from COSTCO HYDROCAD 2026-04-13~Link 16L.hce Link 12L: COSTCO Hydrograph Inflow 46.67 cfs Primary 50 46.67 cfs Inflow Area=21.223 ac 1-yr Primary Outflow 45 Imported from COSTCO HYDROCAD 2026-04-13~Link 16L.hce 40 Area= 924,495 sf 78.41% Imperv. 35 30 Flow (cfs) 25 20 15 10 5 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Time (hours) Page 755 of 1174