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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 8 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=0.77" Tc=6.0 min CN=87 Runoff=0.52 cfs 0.027 af Subcatchment PS-1A: Runoff Area=10,120 sf 38.46% Impervious Runoff Depth=0.77" Tc=6.0 min CN=87 Runoff=0.29 cfs 0.015 af Subcatchment PS-2: Runoff Area=74,205 sf 86.99% Impervious Runoff Depth=1.40" Tc=6.0 min CN=96 Runoff=3.84 cfs 0.199 af Subcatchment PS-3: Runoff Area=28,267 sf 33.49% Impervious Runoff Depth=0.72" Tc=6.0 min CN=86 Runoff=0.74 cfs 0.039 af Subcatchment PS-4: Runoff Area=32,374 sf 64.64% Impervious Runoff Depth=1.08" Tc=6.0 min CN=92 Runoff=1.32 cfs 0.067 af Subcatchment PS-5: Runoff Area=18,756 sf 100.00% Impervious Runoff Depth=1.60" Tc=6.0 min CN=98 Runoff=1.06 cfs 0.057 af Subcatchment PS-6: Runoff Area=6,622 sf 100.00% Impervious Runoff Depth=1.60" Tc=6.0 min CN=98 Runoff=0.37 cfs 0.020 af Subcatchment PS-7: Runoff Area=242,510 sf 0.00% Impervious Runoff Depth=0.46" Flow Length=391' Tc=14.0 min CN=80 Runoff=2.46 cfs 0.212 af Subcatchment PS-8: Runoff Area=53,474 sf 0.00% Impervious Runoff Depth=0.46" Flow Length=821' Slope=0.0100 '/' Tc=25.7 min CN=80 Runoff=0.40 cfs 0.047 af Subcatchment PS-9: OFF-SITE DRAINAGE Runoff Area=217,757 sf 0.78% Impervious Runoff Depth=0.42" Flow Length=857' Slope=0.0100 '/' Tc=59.4 min CN=79 Runoff=0.92 cfs 0.175 af Reach 8R: 15" Pipe Avg. Flow Depth=0.35' Max Vel=3.87 fps Inflow=1.10 cfs 0.222 af 0" Round Pipe n=0.013 L=350.0' S=0.0096 '/' Capacity=6.33 cfs Outflow=1.10 cfs 0.222 af Overflow=0.00 cfs 0.000 af Reach 9R: East Swale Avg. Flow Depth=0.21' Max Vel=2.04 fps Inflow=1.11 cfs 0.222 af n=0.022 L=460.0' S=0.0101 '/' Capacity=303.17 cfs Outflow=1.10 cfs 0.222 af Reach DP-1: Design Point Inflow=2.94 cfs 0.810 af Outflow=2.94 cfs 0.810 af Pond BIO-1: Filtration Bioretention Peak Elev=598.47' Storage=780 cf Inflow=0.52 cfs 0.027 af Primary=0.01 cfs 0.027 af Secondary=0.00 cfs 0.000 af Tertiary=0.00 cfs 0.000 af Outflow=0.01 cfs 0.027 af Pond BIO-1A: Filtration Bioretention Peak Elev=597.88' Storage=454 cf Inflow=0.29 cfs 0.015 af Primary=0.00 cfs 0.015 af Secondary=0.00 cfs 0.000 af Tertiary=0.00 cfs 0.000 af Outflow=0.00 cfs 0.015 af Pond BIO-2: Filtration Bioretention Peak Elev=596.51' Storage=1,048 cf Inflow=0.74 cfs 0.039 af Primary=0.02 cfs 0.039 af Secondary=0.00 cfs 0.000 af Tertiary=0.00 cfs 0.000 af Outflow=0.02 cfs 0.039 af Page 475 of 1174