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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 50 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=4.39" Flow Length=1,050' Tc=4.8 min CN=93 Runoff=140.14 cfs 7.035 af Subcatchment 6S: DA Uncontrolled Runoff Area=11.340 ac 86.77% Impervious Runoff Depth=4.73" Flow Length=850' Tc=6.0 min CN=96 Runoff=80.95 cfs 4.471 af Subcatchment 12S: Slade Ave Runoff Area=0.450 ac 100.00% Impervious Runoff Depth=4.96" Flow Length=90' Tc=0.9 min CN=98 Runoff=3.78 cfs 0.186 af Subcatchment 13S: Slade Ave Runoff Area=0.450 ac 100.00% Impervious Runoff Depth=4.96" Flow Length=90' Tc=0.9 min CN=98 Runoff=3.78 cfs 0.186 af Subcatchment 14S: Proposed - East Runoff Area=6.760 ac 97.78% Impervious Runoff Depth=4.96" Flow Length=890' Tc=4.8 min CN=98 Runoff=52.06 cfs 2.796 af Subcatchment 15S: PDA-3 Runoff Area=11,375 sf 36.48% Impervious Runoff Depth=3.76" Tc=5.0 min CN=87 Runoff=1.68 cfs 0.082 af Pond 16P: OUTLET PIPE Peak Elev=608.42' Inflow=141.36 cfs 22.734 af 58.0" x 94.0" Box Culvert n=0.013 L=641.0' S=0.0034 '/' Outflow=141.36 cfs 22.734 af Pond 18P: POND Peak Elev=612.22' Storage=283,293 cf Inflow=351.21 cfs 18.262 af Primary=90.10 cfs 18.262 af Secondary=0.00 cfs 0.000 af Outflow=90.10 cfs 18.262 af 100-yr LinkPrimary Outflow Imported from COSTCO HYDROCAD 2026-04-13~Link 16L.hce Inflow=154.57 cfs 7.978 af Area= 924,495 sf 78.41% Imperv. Primary=154.57 cfs 7.978 af Link 13L: TOTAL Inflow=141.36 cfs 22.734 af Primary=141.36 cfs 22.734 af Total Runoff Area = 38.471 ac Runoff Volume = 14.756 af Average Runoff Depth = 4.60" 17.87% Pervious = 6.876 ac 82.13% Impervious = 31.595 ac Page 785 of 1174