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E_App E_Post-Development Model NY-West Seneca 24-hr S1 10-yr Rainfall=3.14" Prepared by Labella Associates Printed 4/20/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 24 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=1.78" Tc=6.0 min CN=86 Runoff=1.71 cfs 0.094 af Subcatchment PS-2: Runoff Area=72,316 sf 88.61% Impervious Runoff Depth=2.69" Tc=6.0 min CN=96 Runoff=6.39 cfs 0.372 af Subcatchment PS-3: Runoff Area=28,267 sf 33.49% Impervious Runoff Depth=1.78" Tc=6.0 min CN=86 Runoff=1.75 cfs 0.096 af Subcatchment PS-4: Runoff Area=29,485 sf 70.98% Impervious Runoff Depth=2.39" Tc=6.0 min CN=93 Runoff=2.39 cfs 0.135 af Subcatchment PS-5: Runoff Area=18,756 sf 100.00% Impervious Runoff Depth=2.91" Tc=6.0 min CN=98 Runoff=1.72 cfs 0.104 af Subcatchment PS-6: Runoff Area=6,622 sf 100.00% Impervious Runoff Depth=2.91" Tc=6.0 min CN=98 Runoff=0.61 cfs 0.037 af Subcatchment PS-7: Runoff Area=245,856 sf 0.00% Impervious Runoff Depth=1.36" Flow Length=391' Tc=14.0 min CN=80 Runoff=8.08 cfs 0.638 af Subcatchment PS-8: Runoff Area=53,474 sf 0.00% Impervious Runoff Depth=1.36" Flow Length=821' Slope=0.0100 '/' Tc=25.7 min CN=80 Runoff=1.32 cfs 0.139 af Reach DP-1: Design Point Inflow=13.96 cfs 1.615 af Outflow=13.96 cfs 1.615 af Pond BIO-1: Filtration Bioretention Peak Elev=599.12' Storage=1,232 cf Inflow=1.71 cfs 0.094 af Primary=0.02 cfs 0.045 af Secondary=1.10 cfs 0.049 af Tertiary=0.00 cfs 0.000 af Outflow=1.12 cfs 0.094 af Pond BIO-2: Filtration Bioretention Peak Elev=597.12' Storage=1,319 cf Inflow=1.75 cfs 0.096 af Primary=0.02 cfs 0.048 af Secondary=1.04 cfs 0.048 af Tertiary=0.00 cfs 0.000 af Outflow=1.06 cfs 0.096 af Pond BIO-3: Filtration Bioretention Peak Elev=596.12' Storage=2,359 cf Inflow=2.39 cfs 0.135 af Primary=0.04 cfs 0.084 af Secondary=1.03 cfs 0.050 af Tertiary=0.00 cfs 0.000 af Outflow=1.07 cfs 0.135 af Pond CH-1: Chambers Peak Elev=593.15' Storage=0.161 af Inflow=8.11 cfs 0.476 af 8.0" Round Culvert n=0.013 L=25.0' S=0.0100 '/' Outflow=1.66 cfs 0.476 af Total Runoff Area = 11.074 ac Runoff Volume = 1.615 af Average Runoff Depth = 1.75" 73.21% Pervious = 8.107 ac 26.79% Impervious = 2.967 ac Page 221 of 359