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E_App E_Post-Development Model NY-West Seneca 24-hr S1 100-yr Rainfall=5.22" Prepared by Labella Associates Printed 4/20/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 43 Time span=0.00-72.00 hrs, dt=0.01 hrs, 7201 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 PS-1: Runoff Area=27,596 sf 33.98% Impervious Runoff Depth=3.67" Tc=6.0 min CN=86 Runoff=3.44 cfs 0.194 af Subcatchment PS-2: Runoff Area=72,316 sf 88.61% Impervious Runoff Depth=4.75" Tc=6.0 min CN=96 Runoff=10.80 cfs 0.657 af Subcatchment PS-3: Runoff Area=28,267 sf 33.49% Impervious Runoff Depth=3.67" Tc=6.0 min CN=86 Runoff=3.52 cfs 0.199 af Subcatchment PS-4: Runoff Area=29,485 sf 70.98% Impervious Runoff Depth=4.41" Tc=6.0 min CN=93 Runoff=4.23 cfs 0.249 af Subcatchment PS-5: Runoff Area=18,756 sf 100.00% Impervious Runoff Depth=4.98" Tc=6.0 min CN=98 Runoff=2.85 cfs 0.179 af Subcatchment PS-6: Runoff Area=6,622 sf 100.00% Impervious Runoff Depth=4.98" Tc=6.0 min CN=98 Runoff=1.01 cfs 0.063 af Subcatchment PS-7: Runoff Area=245,856 sf 0.00% Impervious Runoff Depth=3.09" Flow Length=391' Tc=14.0 min CN=80 Runoff=18.94 cfs 1.451 af Subcatchment PS-8: Runoff Area=53,474 sf 0.00% Impervious Runoff Depth=3.09" Flow Length=821' Slope=0.0100 '/' Tc=25.7 min CN=80 Runoff=3.15 cfs 0.316 af Reach DP-1: Design Point Inflow=31.66 cfs 3.307 af Outflow=31.66 cfs 3.307 af Pond BIO-1: Filtration Bioretention Peak Elev=599.25' Storage=1,462 cf Inflow=3.44 cfs 0.194 af Primary=0.02 cfs 0.048 af Secondary=3.18 cfs 0.146 af Tertiary=0.00 cfs 0.000 af Outflow=3.21 cfs 0.194 af Pond BIO-2: Filtration Bioretention Peak Elev=597.25' Storage=1,582 cf Inflow=3.52 cfs 0.199 af Primary=0.02 cfs 0.052 af Secondary=3.23 cfs 0.147 af Tertiary=0.00 cfs 0.000 af Outflow=3.26 cfs 0.199 af Pond BIO-3: Filtration Bioretention Peak Elev=596.27' Storage=2,865 cf Inflow=4.23 cfs 0.249 af Primary=0.04 cfs 0.094 af Secondary=3.57 cfs 0.155 af Tertiary=0.00 cfs 0.000 af Outflow=3.61 cfs 0.249 af Pond CH-1: Chambers Peak Elev=594.85' Storage=0.322 af Inflow=13.65 cfs 0.836 af 8.0" Round Culvert n=0.013 L=25.0' S=0.0100 '/' Outflow=2.40 cfs 0.836 af Total Runoff Area = 11.074 ac Runoff Volume = 3.308 af Average Runoff Depth = 3.58" 73.21% Pervious = 8.107 ac 26.79% Impervious = 2.967 ac Page 240 of 359