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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 25-yr Rainfall=3.84" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 35 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=18,210 sf 38.59% Impervious Runoff Depth=2.49" Tc=6.0 min CN=87 Runoff=1.57 cfs 0.087 af Subcatchment PS-1A: Runoff Area=10,120 sf 38.46% Impervious Runoff Depth=2.49" Tc=6.0 min CN=87 Runoff=0.87 cfs 0.048 af Subcatchment PS-2: Runoff Area=74,205 sf 86.99% Impervious Runoff Depth=3.38" Tc=6.0 min CN=96 Runoff=8.11 cfs 0.480 af Subcatchment PS-3: Runoff Area=28,267 sf 33.49% Impervious Runoff Depth=2.40" Tc=6.0 min CN=86 Runoff=2.35 cfs 0.130 af Subcatchment PS-4: Runoff Area=32,374 sf 64.64% Impervious Runoff Depth=2.96" Tc=6.0 min CN=92 Runoff=3.24 cfs 0.184 af Subcatchment PS-5: Runoff Area=18,756 sf 100.00% Impervious Runoff Depth=3.61" Tc=6.0 min CN=98 Runoff=2.11 cfs 0.129 af Subcatchment PS-6: Runoff Area=6,622 sf 100.00% Impervious Runoff Depth=3.61" Tc=6.0 min CN=98 Runoff=0.74 cfs 0.046 af Subcatchment PS-7: Runoff Area=242,510 sf 0.00% Impervious Runoff Depth=1.91" Flow Length=391' Tc=14.0 min CN=80 Runoff=11.45 cfs 0.886 af Subcatchment PS-8: Runoff Area=53,474 sf 0.00% Impervious Runoff Depth=1.91" Flow Length=821' Slope=0.0100 '/' Tc=25.7 min CN=80 Runoff=1.91 cfs 0.195 af Subcatchment PS-9: OFF-SITE DRAINAGE Runoff Area=217,757 sf 0.78% Impervious Runoff Depth=1.83" Flow Length=857' Slope=0.0100 '/' Tc=59.4 min CN=79 Runoff=4.77 cfs 0.764 af Reach 8R: 15" Pipe Avg. Flow Depth=0.93' Max Vel=5.84 fps Inflow=5.71 cfs 0.960 af 0" Round Pipe n=0.013 L=350.0' S=0.0096 '/' Capacity=6.33 cfs Outflow=5.70 cfs 0.960 af Overflow=0.00 cfs 0.000 af Reach 9R: East Swale Avg. Flow Depth=0.50' Max Vel=3.29 fps Inflow=5.72 cfs 0.960 af n=0.022 L=460.0' S=0.0101 '/' Capacity=303.17 cfs Outflow=5.71 cfs 0.960 af Reach DP-1: Design Point Inflow=16.38 cfs 2.887 af Outflow=16.38 cfs 2.887 af Pond BIO-1: Filtration Bioretention Peak Elev=599.09' Storage=1,543 cf Inflow=1.57 cfs 0.087 af Primary=0.02 cfs 0.048 af Secondary=0.69 cfs 0.036 af Tertiary=0.00 cfs 0.000 af Outflow=0.71 cfs 0.083 af Pond BIO-1A: Filtration Bioretention Peak Elev=599.01' Storage=1,417 cf Inflow=0.87 cfs 0.048 af Primary=0.02 cfs 0.044 af Secondary=0.01 cfs 0.001 af Tertiary=0.00 cfs 0.000 af Outflow=0.03 cfs 0.046 af Pond BIO-2: Filtration Bioretention Peak Elev=597.11' Storage=2,288 cf Inflow=2.35 cfs 0.130 af Primary=0.03 cfs 0.072 af Secondary=0.99 cfs 0.055 af Tertiary=0.00 cfs 0.000 af Outflow=1.01 cfs 0.126 af Page 502 of 1174