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24-4113 WEST SENECA EXCAHNGENY-WestSeneca_NOAA14 24-hr S1 25-yr Rainfall=4.10" Prepared by Carmina Wood Design Printed 7/13/2026 HydroCAD® 10.20-7a s/n 05019 © 2025 HydroCAD Software Solutions LLC Page 36 Time span=0.00-150.00 hrs, dt=0.01 hrs, 15001 points Runoff by SCS TR-20 method, UH=SCS, Weighted-CN Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Subcatchment 1S: Proposed - West Runoff Area=19.210 ac 73.66% Impervious Runoff Depth=3.32" Flow Length=1,050' Tc=4.8 min CN=93 Runoff=107.55 cfs 5.310 af Subcatchment 6S: DA Uncontrolled Runoff Area=11.340 ac 86.77% Impervious Runoff Depth=3.64" Flow Length=850' Tc=6.0 min CN=96 Runoff=63.19 cfs 3.439 af Subcatchment 12S: Slade Ave Runoff Area=0.450 ac 100.00% Impervious Runoff Depth=3.86" Flow Length=90' Tc=0.9 min CN=98 Runoff=2.98 cfs 0.145 af Subcatchment 13S: Slade Ave Runoff Area=0.450 ac 100.00% Impervious Runoff Depth=3.86" Flow Length=90' Tc=0.9 min CN=98 Runoff=2.98 cfs 0.145 af Subcatchment 14S: Proposed - East Runoff Area=6.760 ac 97.78% Impervious Runoff Depth=3.86" Flow Length=890' Tc=4.8 min CN=98 Runoff=40.97 cfs 2.177 af Subcatchment 15S: PDA-3 Runoff Area=11,375 sf 36.48% Impervious Runoff Depth=2.73" Tc=5.0 min CN=87 Runoff=1.24 cfs 0.059 af Pond 16P: OUTLET PIPE Peak Elev=607.58' Inflow=109.83 cfs 17.346 af 58.0" x 94.0" Box Culvert n=0.013 L=641.0' S=0.0034 '/' Outflow=109.83 cfs 17.346 af Pond 18P: POND Peak Elev=611.43' Storage=223,774 cf Inflow=271.07 cfs 13.907 af Primary=69.28 cfs 13.907 af Secondary=0.00 cfs 0.000 af Outflow=69.28 cfs 13.907 af 25-yr LinkPrimary Outflow Imported from COSTCO HYDROCAD 2026-04-13~Link 16L.hce Inflow=119.16 cfs 6.071 af Area= 924,495 sf 78.41% Imperv. Primary=119.16 cfs 6.071 af Link 13L: TOTAL Inflow=109.83 cfs 17.346 af Primary=109.83 cfs 17.346 af Total Runoff Area = 38.471 ac Runoff Volume = 11.276 af Average Runoff Depth = 3.52" 17.87% Pervious = 6.876 ac 82.13% Impervious = 31.595 ac Page 771 of 1174