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24-4113 WEST SENECA EXCAHNG NY-WestSeneca_NOAA14 24-hr S1 100-yr Rainfall=5.20" Prepared by Carmina Wood Design Printed 7/13/2026 HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 62 Summary for Link 12L: COSTCO Inflow Area = 21.223 ac, 78.41% Impervious, Inflow Depth = 4.51" for 100-yr event Inflow = 154.57 cfs @ 12.03 hrs, Volume= 7.978 af Primary = 154.57 cfs @ 12.03 hrs, Volume= 7.978 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 100-yr Primary Outflow Imported from COSTCO HYDROCAD 2026-04-13~Link 16L.hce Link 12L: COSTCO Hydrograph Inflow 170 154.57 cfs Primary 154.57 cfs Inflow Area=21.223 ac 160 100-yr Primary Outflow 150 Imported from 140 COSTCO HYDROCAD 2026-04-13~Link 16L.hce Area= 924,495 sf 130 78.41% Imperv. 120 110 100 Flow (cfs) 90 80 70 60 50 40 30 20 10 0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Time (hours) Page 797 of 1174