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E_App E_Post-Development Model NY-West Seneca 24-hr S1 1-yr Rainfall=1.82" Prepared by Labella Associates Printed 4/20/2026 HydroCAD® 10.20-7a s/n 09581 © 2025 HydroCAD Software Solutions LLC Page 5 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=0.72" Tc=6.0 min CN=86 Runoff=0.72 cfs 0.038 af Subcatchment PS-2: Runoff Area=72,316 sf 88.61% Impervious Runoff Depth=1.40" Tc=6.0 min CN=96 Runoff=3.74 cfs 0.194 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=29,485 sf 70.98% Impervious Runoff Depth=1.15" Tc=6.0 min CN=93 Runoff=1.28 cfs 0.065 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=245,856 sf 0.00% Impervious Runoff Depth=0.46" Flow Length=391' Tc=14.0 min CN=80 Runoff=2.49 cfs 0.215 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 Reach DP-1: Design Point Inflow=4.12 cfs 0.674 af Outflow=4.12 cfs 0.674 af Pond BIO-1: Filtration Bioretention Peak Elev=598.98' Storage=994 cf Inflow=0.72 cfs 0.038 af Primary=0.02 cfs 0.038 af Secondary=0.00 cfs 0.000 af Tertiary=0.00 cfs 0.000 af Outflow=0.02 cfs 0.038 af Pond BIO-2: Filtration Bioretention Peak Elev=596.95' Storage=1,010 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 Pond BIO-3: Filtration Bioretention Peak Elev=595.92' Storage=1,729 cf Inflow=1.28 cfs 0.065 af Primary=0.04 cfs 0.065 af Secondary=0.00 cfs 0.000 af Tertiary=0.00 cfs 0.000 af Outflow=0.04 cfs 0.065 af Pond CH-1: Chambers Peak Elev=592.38' Storage=0.079 af Inflow=4.80 cfs 0.251 af 8.0" Round Culvert n=0.013 L=25.0' S=0.0100 '/' Outflow=1.18 cfs 0.251 af Total Runoff Area = 11.074 ac Runoff Volume = 0.674 af Average Runoff Depth = 0.73" 73.21% Pervious = 8.107 ac 26.79% Impervious = 2.967 ac Page 202 of 359