29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 59 Summary for Pond 15P: Rear Yard Basin Inflow Area = 0.636 ac, 34.80% Impervious, Inflow Depth = 4.45" for 10-Year-2050 event Inflow = 1.87 cfs @ 12.09 hrs, Volume= 0.236 af Outflow = 1.19 cfs @ 12.44 hrs, Volume= 0.236 af, Atten= 36%, Lag= 21.2 min Primary = 1.19 cfs @ 12.44 hrs, Volume= 0.236 af Routed to Reach 12R : Study Point At Inlet Routing by Stor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Peak Elev= 564.44' @ 12.44 hrs Surf.Area= 1,526 sf Storage= 2,523 cf Plug-Flow detention time= 78.5 min calculated for 0.236 af (100% of inflow) Center-of-Mass det. time= 78.5 min ( 874.3 - 795.8 ) Volume Invert Avail.Storage Storage Description #1A 562.00' 1,388 cf 20.50'W x 74.43'L x 3.50'H Field A 5,341 cf Overall - 1,871 cf Embedded = 3,470 cf x 40.0% Voids #2A 562.50' 1,871 cf Cultec R-300HD x 40 Inside #1 Effective Size= 45.6"W x 30.0"H => 6.53 sf x 7.08'L = 46.2 cf Overall Size= 51.0"W x 30.0"H x 7.54'L with 0.46' Overlap 40 Chambers in 4 Rows Cap Storage= 2.7 cf x 2 x 4 rows = 21.2 cf 3,259 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 562.00' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 563.80' 8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 564.40' 8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=1.19 cfs @ 12.44 hrs HW=564.44' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.25 cfs @ 7.36 fps) 2=Orifice/Grate (Orifice Controls 0.94 cfs @ 2.72 fps) 3=Orifice/Grate (Orifice Controls 0.01 cfs @ 0.68 fps)

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 60 Pond 15P: Rear Yard Basin Hydrograph Inflow 1.87 cfs Primary 2 Inflow Area=0.636 ac Peak Elev=564.44' Storage=2,523 cf 1.19 cfs Flow (cfs) 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

29906 15 Ridgeway West Orange S NOAA 24-hr D 100-Year-2050 Rainfall=11.52", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 61 Summary for Pond 15P: Rear Yard Basin Inflow Area = 0.636 ac, 34.80% Impervious, Inflow Depth = 9.30" for 100-Year-2050 event Inflow = 3.70 cfs @ 12.09 hrs, Volume= 0.493 af Outflow = 3.15 cfs @ 12.10 hrs, Volume= 0.493 af, Atten= 15%, Lag= 0.8 min Primary = 3.15 cfs @ 12.10 hrs, Volume= 0.493 af Routed to Reach 12R : Study Point At Inlet Routing by Stor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Peak Elev= 565.19' @ 12.10 hrs Surf.Area= 1,526 sf Storage= 3,070 cf Plug-Flow detention time= 63.6 min calculated for 0.493 af (100% of inflow) Center-of-Mass det. time= 63.6 min ( 848.4 - 784.8 ) Volume Invert Avail.Storage Storage Description #1A 562.00' 1,388 cf 20.50'W x 74.43'L x 3.50'H Field A 5,341 cf Overall - 1,871 cf Embedded = 3,470 cf x 40.0% Voids #2A 562.50' 1,871 cf Cultec R-300HD x 40 Inside #1 Effective Size= 45.6"W x 30.0"H => 6.53 sf x 7.08'L = 46.2 cf Overall Size= 51.0"W x 30.0"H x 7.54'L with 0.46' Overlap 40 Chambers in 4 Rows Cap Storage= 2.7 cf x 2 x 4 rows = 21.2 cf 3,259 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Primary 562.00' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #2 Primary 563.80' 8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 564.40' 8.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads Primary OutFlow Max=3.14 cfs @ 12.10 hrs HW=565.19' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.29 cfs @ 8.45 fps) 2=Orifice/Grate (Orifice Controls 1.72 cfs @ 4.94 fps) 3=Orifice/Grate (Orifice Controls 1.13 cfs @ 3.24 fps)

29906 15 Ridgeway West Orange S NOAA 24-hr D 100-Year-2050 Rainfall=11.52", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 62 Pond 15P: Rear Yard Basin Hydrograph Inflow 3.70 cfs Primary 4 Inflow Area=0.636 ac 3.15 cfs Peak Elev=565.19' 3 Storage=3,070 cf Flow (cfs) 2 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

29906 15 Ridgeway West Orange Seco NOAA 24-hr D 2-Year-2020 Rainfall=3.47", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 63 Summary for Reach 12R: Study Point At Inlet Inflow Area = 1.108 ac, 34.01% Impervious, Inflow Depth = 1.60" for 2-Year-2020 event Inflow = 0.42 cfs @ 12.40 hrs, Volume= 0.147 af Outflow = 0.42 cfs @ 12.40 hrs, Volume= 0.147 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Reach 12R: Study Point At Inlet Hydrograph Inflow 0.42 cfs Outflow 0.46 0.42 cfs 0.44 0.42 Inflow Area=1.108 ac 0.4 0.38 0.36 0.34 0.32 0.3 0.28 Flow (cfs) 0.26 0.24 0.22 0.2 0.18 0.16 0.14 0.12 0.1 0.08 0.06 0.04 0.02 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2020 Rainfall=5.38", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 64 Summary for Reach 12R: Study Point At Inlet Inflow Area = 1.108 ac, 34.01% Impervious, Inflow Depth = 3.18" for 10-Year-2020 event Inflow = 1.35 cfs @ 12.49 hrs, Volume= 0.294 af Outflow = 1.35 cfs @ 12.49 hrs, Volume= 0.294 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Reach 12R: Study Point At Inlet Hydrograph Inflow 1.35 cfs Outflow 1.35 cfs Inflow Area=1.108 ac 1 Flow (cfs) 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

29906 15 Ridgeway West Orange Se NOAA 24-hr D 100-Year-2020 Rainfall=9.18", P2=3.47" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 65 Summary for Reach 12R: Study Point At Inlet Inflow Area = 1.108 ac, 34.01% Impervious, Inflow Depth = 6.65" for 100-Year-2020 event Inflow = 4.18 cfs @ 12.11 hrs, Volume= 0.614 af Outflow = 4.18 cfs @ 12.11 hrs, Volume= 0.614 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Reach 12R: Study Point At Inlet Hydrograph Inflow 4.18 cfs Outflow 4.18 cfs Inflow Area=1.108 ac 4 3 Flow (cfs) 2 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

29906 15 Ridgeway West Orange Seco NOAA 24-hr D 2-Year-2050 Rainfall=4.09", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 66 Summary for Reach 12R: Study Point At Inlet Inflow Area = 1.108 ac, 34.01% Impervious, Inflow Depth = 2.09" for 2-Year-2050 event Inflow = 0.64 cfs @ 12.31 hrs, Volume= 0.193 af Outflow = 0.64 cfs @ 12.31 hrs, Volume= 0.193 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Reach 12R: Study Point At Inlet Hydrograph Inflow 0.7 0.64 cfs Outflow 0.64 cfs 0.65 Inflow Area=1.108 ac 0.6 0.55 0.5 0.45 Flow (cfs) 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

29906 15 Ridgeway West Orange Sec NOAA 24-hr D 10-Year-2050 Rainfall=6.37", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 67 Summary for Reach 12R: Study Point At Inlet Inflow Area = 1.108 ac, 34.01% Impervious, Inflow Depth = 4.06" for 10-Year-2050 event Inflow = 2.12 cfs @ 12.33 hrs, Volume= 0.375 af Outflow = 2.12 cfs @ 12.33 hrs, Volume= 0.375 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Reach 12R: Study Point At Inlet Hydrograph Inflow 2.12 cfs Outflow 2.12 cfs Inflow Area=1.108 ac 2 Flow (cfs) 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)

29906 15 Ridgeway West Orange S NOAA 24-hr D 100-Year-2050 Rainfall=11.52", P2=4.09" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 68 Summary for Reach 12R: Study Point At Inlet Inflow Area = 1.108 ac, 34.01% Impervious, Inflow Depth = 8.87" for 100-Year-2050 event Inflow = 5.85 cfs @ 12.11 hrs, Volume= 0.820 af Outflow = 5.85 cfs @ 12.11 hrs, Volume= 0.820 af, Atten= 0%, Lag= 0.0 min Routing by Stor-Ind+Trans method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Reach 12R: Study Point At Inlet Hydrograph Inflow 5.85 cfs Outflow 5.85 cfs 6 Inflow Area=1.108 ac 5 4 Flow (cfs) 3 2 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 Time (hours)