29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

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 43 Summary for Pond 12P: Front Yard Basin Inflow Area = 0.305 ac, 50.99% Impervious, Inflow Depth = 2.72" for 2-Year-2050 event Inflow = 1.08 cfs @ 12.09 hrs, Volume= 0.069 af Outflow = 0.28 cfs @ 12.22 hrs, Volume= 0.069 af, Atten= 74%, Lag= 7.7 min Discarded = 0.02 cfs @ 12.22 hrs, Volume= 0.029 af Primary = 0.26 cfs @ 12.22 hrs, Volume= 0.040 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 / 2 Peak Elev= 564.51' @ 12.22 hrs Surf.Area= 1,086 sf Storage= 1,089 cf Plug-Flow detention time= 154.4 min calculated for 0.069 af (100% of inflow) Center-of-Mass det. time= 154.5 min ( 965.8 - 811.3 ) Volume Invert Avail.Storage Storage Description #1A 563.00' 1,082 cf 12.75'W x 85.17'L x 4.00'H Field A 4,343 cf Overall - 1,638 cf Embedded = 2,705 cf x 40.0% Voids #2A 563.50' 1,638 cf Cultec R-360HD x 44 Inside #1 Effective Size= 54.9"W x 36.0"H => 9.99 sf x 3.67'L = 36.6 cf Overall Size= 60.0"W x 36.0"H x 4.17'L with 0.50' Overlap 44 Chambers in 2 Rows Cap Storage= 6.5 cf x 2 x 2 rows = 25.8 cf 2,720 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 563.00' 0.500 in/hr Exfiltration over Horizontal area below 563.50' Conductivity to Groundwater Elevation = 560.30' #2 Primary 563.65' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 564.30' 6.0" Vert. 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

0' 6.0" Vert. 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 @ 12.22 hrs HW=564.51' (Free Discharge) 1=Exfiltration ( Controls 0.02 cfs) Primary OutFlow Max=0.26 cfs @ 12.22 hrs HW=564.51' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.14 cfs @ 4.18 fps) 3=Orifice/Grate (Orifice Controls 0.12 cfs @ 1.55 fps) 4=Orifice/Grate ( Controls 0.00 cfs) 5=Broad-Crested Rectangular Weir ( 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 44 Pond 12P: Front Yard Basin Hydrograph 1.08 cfs Inflow Outflow Inflow Area=0.305 ac Discarded Primary Peak Elev=564.51' 1 Storage=1,089 cf Flow (cfs) 0.28 cfs 0.26 cfs 0.02 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 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 45 Summary for Pond 12P: Front Yard Basin Inflow Area = 0.305 ac, 50.99% Impervious, Inflow Depth = 4.87" for 10-Year-2050 event Inflow = 1.85 cfs @ 12.09 hrs, Volume= 0.124 af Outflow = 1.21 cfs @ 12.11 hrs, Volume= 0.124 af, Atten= 35%, Lag= 1.0 min Discarded = 0.02 cfs @ 12.11 hrs, Volume= 0.033 af Primary = 1.19 cfs @ 12.11 hrs, Volume= 0.091 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 / 2 Peak Elev= 565.11' @ 12.11 hrs Surf.Area= 1,086 sf Storage= 1,577 cf Plug-Flow detention time= 109.3 min calculated for 0.124 af (100% of inflow) Center-of-Mass det. time= 109.4 min ( 902.6 - 793.1 ) Volume Invert Avail.Storage Storage Description #1A 563.00' 1,082 cf 12.75'W x 85.17'L x 4.00'H Field A 4,343 cf Overall - 1,638 cf Embedded = 2,705 cf x 40.0% Voids #2A 563.50' 1,638 cf Cultec R-360HD x 44 Inside #1 Effective Size= 54.9"W x 36.0"H => 9.99 sf x 3.67'L = 36.6 cf Overall Size= 60.0"W x 36.0"H x 4.17'L with 0.50' Overlap 44 Chambers in 2 Rows Cap Storage= 6.5 cf x 2 x 2 rows = 25.8 cf 2,720 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 563.00' 0.500 in/hr Exfiltration over Horizontal area below 563.50' Conductivity to Groundwater Elevation = 560.30' #2 Primary 563.65' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 564.30' 6.0" Vert. 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

0' 6.0" Vert. 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 @ 12.11 hrs HW=565.10' (Free Discharge) 1=Exfiltration ( Controls 0.02 cfs) Primary OutFlow Max=1.19 cfs @ 12.11 hrs HW=565.10' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.19 cfs @ 5.59 fps) 3=Orifice/Grate (Orifice Controls 0.70 cfs @ 3.58 fps) 4=Orifice/Grate (Orifice Controls 0.29 cfs @ 2.16 fps) 5=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)

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 46 Pond 12P: Front Yard Basin Hydrograph 1.85 cfs Inflow Outflow 2 Inflow Area=0.305 ac Discarded Primary Peak Elev=565.11' Storage=1,577 cf 1.21 cfs 1.19 cfs Flow (cfs) 1 0.02 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 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 47 Summary for Pond 12P: Front Yard Basin Inflow Area = 0.305 ac, 50.99% Impervious, Inflow Depth = 9.90" for 100-Year-2050 event Inflow = 3.56 cfs @ 12.09 hrs, Volume= 0.252 af Outflow = 2.21 cfs @ 12.11 hrs, Volume= 0.252 af, Atten= 38%, Lag= 1.1 min Discarded = 0.03 cfs @ 12.11 hrs, Volume= 0.039 af Primary = 2.18 cfs @ 12.11 hrs, Volume= 0.213 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 / 2 Peak Elev= 566.15' @ 12.11 hrs Surf.Area= 1,086 sf Storage= 2,325 cf Plug-Flow detention time= 76.0 min calculated for 0.252 af (100% of inflow) Center-of-Mass det. time= 76.2 min ( 848.6 - 772.4 ) Volume Invert Avail.Storage Storage Description #1A 563.00' 1,082 cf 12.75'W x 85.17'L x 4.00'H Field A 4,343 cf Overall - 1,638 cf Embedded = 2,705 cf x 40.0% Voids #2A 563.50' 1,638 cf Cultec R-360HD x 44 Inside #1 Effective Size= 54.9"W x 36.0"H => 9.99 sf x 3.67'L = 36.6 cf Overall Size= 60.0"W x 36.0"H x 4.17'L with 0.50' Overlap 44 Chambers in 2 Rows Cap Storage= 6.5 cf x 2 x 2 rows = 25.8 cf 2,720 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 563.00' 0.500 in/hr Exfiltration over Horizontal area below 563.50' Conductivity to Groundwater Elevation = 560.30' #2 Primary 563.65' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 564.30' 6.0" Vert. 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

564.30' 6.0" Vert. 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=0.03 cfs @ 12.11 hrs HW=566.15' (Free Discharge) 1=Exfiltration ( Controls 0.03 cfs) Primary OutFlow Max=2.18 cfs @ 12.11 hrs HW=566.15' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.25 cfs @ 7.45 fps) 3=Orifice/Grate (Orifice Controls 1.20 cfs @ 6.09 fps) 4=Orifice/Grate (Orifice Controls 0.73 cfs @ 5.36 fps) 5=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)

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 48 Pond 12P: Front Yard Basin Hydrograph 3.56 cfs Inflow Outflow Inflow Area=0.305 ac Discarded Primary Peak Elev=566.15' Storage=2,325 cf 3 2.21 cfs 2.18 cfs Flow (cfs) 2 1 0.03 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 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 49 Summary for Pond 12P: Front Yard Basin Inflow Area = 0.305 ac, 50.99% Impervious, Inflow Depth = 0.37" for WQDS event Inflow = 0.48 cfs @ 1.08 hrs, Volume= 0.009 af Outflow = 0.02 cfs @ 2.00 hrs, Volume= 0.009 af, Atten= 97%, Lag= 55.4 min Discarded = 0.02 cfs @ 2.00 hrs, Volume= 0.009 af Primary = 0.00 cfs @ 2.00 hrs, Volume= 0.000 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 / 2 Peak Elev= 563.65' @ 2.00 hrs Surf.Area= 1,086 sf Storage= 352 cf Plug-Flow detention time= 213.1 min calculated for 0.009 af (100% of inflow) Center-of-Mass det. time= 213.0 min ( 286.3 - 73.3 ) Volume Invert Avail.Storage Storage Description #1A 563.00' 1,082 cf 12.75'W x 85.17'L x 4.00'H Field A 4,343 cf Overall - 1,638 cf Embedded = 2,705 cf x 40.0% Voids #2A 563.50' 1,638 cf Cultec R-360HD x 44 Inside #1 Effective Size= 54.9"W x 36.0"H => 9.99 sf x 3.67'L = 36.6 cf Overall Size= 60.0"W x 36.0"H x 4.17'L with 0.50' Overlap 44 Chambers in 2 Rows Cap Storage= 6.5 cf x 2 x 2 rows = 25.8 cf 2,720 cf Total Available Storage Storage Group A created with Chamber Wizard Device Routing Invert Outlet Devices #1 Discarded 563.00' 0.500 in/hr Exfiltration over Horizontal area below 563.50' Conductivity to Groundwater Elevation = 560.30' #2 Primary 563.65' 2.5" Vert. Orifice/Grate C= 0.600 Limited to weir flow at low heads #3 Primary 564.30' 6.0" Vert. 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'