29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

Orifice/Grate C= 0.600 Limited to weir flow at low heads #4 Primary 564.70' 5.0" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #5 Primary 566.95' 4.0' long x 1.0' breadth Broad-Crested Rectangular Weir Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00 2.50 3.00 Coef. (English) 2.69 2.72 2.75 2.85 2.98 3.08 3.20 3.28 3.31 3.30 3.31 3.32 Discarded OutFlow Max=0.02 cfs @ 2.00 hrs HW=563.65' (Free Discharge) 1=Exfiltration ( Controls 0.02 cfs) Primary OutFlow Max=0.00 cfs @ 2.00 hrs HW=563.65' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.00 cfs @ 0.16 fps) 3=Orifice/Grate ( Controls 0.00 cfs) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)

29906 15 Ridgeway West Orange Second Su NJ DEP 2-hr WQDS Rainfall=1.25", P2=3.44" Prepared by Ensurplan Inc Printed 5/26/2026 HydroCAD® 10.20-8a s/n 11646 © 2025 HydroCAD Software Solutions LLC Page 50 Pond 12P: Front Yard Basin Hydrograph 0.48 cfs Inflow Outflow Inflow Area=0.305 ac Discarded Primary 0.5 Peak Elev=563.65' 0.45 Storage=352 cf 0.4 0.35 Flow (cfs) 0.3 0.25 0.2 0.15 0.1 0.02 cfs 0.02 cfs 0.05 0.00 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 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 51 Summary for Pond 15P: Rear Yard Basin Inflow Area = 0.636 ac, 34.80% Impervious, Inflow Depth = 1.94" for 2-Year-2020 event Inflow = 0.88 cfs @ 12.09 hrs, Volume= 0.103 af Outflow = 0.19 cfs @ 13.01 hrs, Volume= 0.103 af, Atten= 79%, Lag= 55.0 min Primary = 0.19 cfs @ 13.01 hrs, Volume= 0.103 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= 563.39' @ 13.01 hrs Surf.Area= 1,526 sf Storage= 1,392 cf Plug-Flow detention time= 81.3 min calculated for 0.103 af (100% of inflow) Center-of-Mass det. time= 81.4 min ( 884.9 - 803.5 ) 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=0.19 cfs @ 13.01 hrs HW=563.39' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.19 cfs @ 5.45 fps) 2=Orifice/Grate ( Controls 0.00 cfs) 3=Orifice/Grate ( Controls 0.00 cfs)

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 52 Pond 15P: Rear Yard Basin Hydrograph Inflow 0.88 cfs Primary 0.95 0.9 0.85 Inflow Area=0.636 ac 0.8 Peak Elev=563.39' 0.75 0.7 Storage=1,392 cf 0.65 0.6 Flow (cfs) 0.55 0.5 0.45 0.4 0.35 0.3 0.25 0.19 cfs 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-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 53 Summary for Pond 15P: Rear Yard Basin Inflow Area = 0.636 ac, 34.80% Impervious, Inflow Depth = 3.56" for 10-Year-2020 event Inflow = 1.50 cfs @ 12.09 hrs, Volume= 0.189 af Outflow = 0.77 cfs @ 12.53 hrs, Volume= 0.189 af, Atten= 49%, Lag= 26.8 min Primary = 0.77 cfs @ 12.53 hrs, Volume= 0.189 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= 564.23' @ 12.53 hrs Surf.Area= 1,526 sf Storage= 2,319 cf Plug-Flow detention time= 85.1 min calculated for 0.189 af (100% of inflow) Center-of-Mass det. time= 85.1 min ( 884.4 - 799.3 ) 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=0.77 cfs @ 12.53 hrs HW=564.23' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.24 cfs @ 7.02 fps) 2=Orifice/Grate (Orifice Controls 0.53 cfs @ 2.23 fps) 3=Orifice/Grate ( Controls 0.00 cfs)

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 54 Pond 15P: Rear Yard Basin Hydrograph Inflow 1.50 cfs Primary Inflow Area=0.636 ac Peak Elev=564.23' Storage=2,319 cf 1 Flow (cfs) 0.77 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 55 Summary for Pond 15P: Rear Yard Basin Inflow Area = 0.636 ac, 34.80% Impervious, Inflow Depth = 7.06" for 100-Year-2020 event Inflow = 2.79 cfs @ 12.09 hrs, Volume= 0.374 af Outflow = 2.12 cfs @ 12.39 hrs, Volume= 0.374 af, Atten= 24%, Lag= 17.8 min Primary = 2.12 cfs @ 12.39 hrs, Volume= 0.374 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= 564.80' @ 12.39 hrs Surf.Area= 1,526 sf Storage= 2,826 cf Plug-Flow detention time= 68.3 min calculated for 0.374 af (100% of inflow) Center-of-Mass det. time= 68.3 min ( 858.6 - 790.3 ) 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=2.12 cfs @ 12.39 hrs HW=564.80' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.27 cfs @ 7.91 fps) 2=Orifice/Grate (Orifice Controls 1.38 cfs @ 3.94 fps) 3=Orifice/Grate (Orifice Controls 0.48 cfs @ 2.16 fps)

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 56 Pond 15P: Rear Yard Basin Hydrograph Inflow 2.79 cfs Primary 3 Inflow Area=0.636 ac Peak Elev=564.80' 2.12 cfs Storage=2,826 cf 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 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 57 Summary for Pond 15P: Rear Yard Basin Inflow Area = 0.636 ac, 34.80% Impervious, Inflow Depth = 2.45" for 2-Year-2050 event Inflow = 1.09 cfs @ 12.09 hrs, Volume= 0.130 af Outflow = 0.22 cfs @ 13.03 hrs, Volume= 0.130 af, Atten= 80%, Lag= 56.5 min Primary = 0.22 cfs @ 13.03 hrs, Volume= 0.130 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= 563.83' @ 13.03 hrs Surf.Area= 1,526 sf Storage= 1,901 cf Plug-Flow detention time= 94.1 min calculated for 0.130 af (100% of inflow) Center-of-Mass det. time= 94.0 min ( 895.6 - 801.5 ) 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=0.22 cfs @ 13.03 hrs HW=563.83' (Free Discharge) 1=Orifice/Grate (Orifice Controls 0.22 cfs @ 6.33 fps) 2=Orifice/Grate (Orifice Controls 0.00 cfs @ 0.62 fps) 3=Orifice/Grate ( Controls 0.00 cfs)

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 58 Pond 15P: Rear Yard Basin Hydrograph Inflow 1.09 cfs Primary Inflow Area=0.636 ac 1 Peak Elev=563.83' Storage=1,901 cf Flow (cfs) 0.22 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)