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WEST SENECA - POST DEVELOPMENT E_App E_Post-Development Model_REV 2 NY-West Seneca 24-hr S1 100-yr Rainfall=5.22" Prepared by Labella Associates Printed 7/26/2026 HydroCAD® 10.20-6a s/n 09581 © 2024 HydroCAD Software Solutions LLC Page 62 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=3.77" Tc=6.0 min CN=87 Runoff=2.32 cfs 0.132 af Subcatchment PS-1A: Runoff Area=10,120 sf 38.46% Impervious Runoff Depth=3.77" Tc=6.0 min CN=87 Runoff=1.29 cfs 0.073 af Subcatchment PS-2: Runoff Area=74,205 sf 86.99% Impervious Runoff Depth=4.75" Tc=6.0 min CN=96 Runoff=11.08 cfs 0.674 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=32,374 sf 64.64% Impervious Runoff Depth=4.30" Tc=6.0 min CN=92 Runoff=4.57 cfs 0.267 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=242,510 sf 0.00% Impervious Runoff Depth=3.09" Flow Length=391' Tc=14.0 min CN=80 Runoff=18.68 cfs 1.432 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 Subcatchment PS-9: OFF-SITE DRAINAGE Runoff Area=217,757 sf 0.78% Impervious Runoff Depth=2.99" Flow Length=857' Slope=0.0100 '/' Tc=59.4 min CN=79 Runoff=8.05 cfs 1.246 af Reach 8R: 15" Pipe Avg. Flow Depth=1.02' Max Vel=5.88 fps Inflow=9.63 cfs 1.562 af 0" Round Pipe n=0.013 L=350.0' S=0.0096 '/' Capacity=6.33 cfs Outflow=6.33 cfs 1.405 af Overflow=3.30 cfs 0.157 af Reach 9R: East Swale Avg. Flow Depth=0.64' Max Vel=3.79 fps Inflow=9.64 cfs 1.562 af n=0.022 L=460.0' S=0.0101 '/' Capacity=303.17 cfs Outflow=9.63 cfs 1.562 af Reach DP-1: Design Point Inflow=31.21 cfs 4.516 af Outflow=31.21 cfs 4.516 af Pond BIO-1: Filtration Bioretention Peak Elev=599.18' Storage=1,692 cf Inflow=2.32 cfs 0.132 af Primary=0.02 cfs 0.049 af Secondary=2.06 cfs 0.080 af Tertiary=0.00 cfs 0.000 af Outflow=2.08 cfs 0.128 af Pond BIO-1A: Filtration Bioretention Peak Elev=599.07' Storage=1,508 cf Inflow=1.29 cfs 0.073 af Primary=0.02 cfs 0.047 af Secondary=0.45 cfs 0.023 af Tertiary=0.00 cfs 0.000 af Outflow=0.46 cfs 0.070 af Pond BIO-2: Filtration Bioretention Peak Elev=597.23' Storage=2,585 cf Inflow=3.52 cfs 0.199 af Primary=0.03 cfs 0.073 af Secondary=2.92 cfs 0.122 af Tertiary=0.00 cfs 0.000 af Outflow=2.95 cfs 0.195 af Page 529 of 1174