29906 15 Ridgeway West Orange 5 26 26 HydroCAD Report

Runoff Depth=8.17" Flow Length=231' Slope=0.0260 '/' Tc=22.2 min CN=74 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 37 Summary for Pond 12P: Front Yard Basin Inflow Area = 0.305 ac, 50.99% Impervious, Inflow Depth = 2.16" for 2-Year-2020 event Inflow = 0.87 cfs @ 12.09 hrs, Volume= 0.055 af Outflow = 0.14 cfs @ 12.50 hrs, Volume= 0.055 af, Atten= 84%, Lag= 24.9 min Discarded = 0.02 cfs @ 12.50 hrs, Volume= 0.027 af Primary = 0.12 cfs @ 12.50 hrs, Volume= 0.027 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= 564.31' @ 12.50 hrs Surf.Area= 1,086 sf Storage= 921 cf Plug-Flow detention time= 173.8 min calculated for 0.055 af (100% of inflow) Center-of-Mass det. time= 173.8 min ( 992.4 - 818.6 ) 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 @ 12.50 hrs HW=564.31' (Free Discharge) 1=Exfiltration ( Controls 0.02 cfs) Primary OutFlow Max=0.12 cfs @ 12.50 hrs HW=564.31' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.12 cfs @ 3.59 fps) 3=Orifice/Grate (Orifice Controls 0.00 cfs @ 0.32 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-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 38 Pond 12P: Front Yard Basin Hydrograph 0.87 cfs Inflow Outflow 0.95 Inflow Area=0.305 ac Discarded Primary 0.9 0.85 Peak Elev=564.31' 0.8 0.75 Storage=921 cf 0.7 0.65 0.6 Flow (cfs) 0.55 0.5 0.45 0.4 0.35 0.3 0.14 cfs 0.25 0.2 0.12 cfs 0.15 0.02 cfs 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 39 Summary for Pond 12P: Front Yard Basin Inflow Area = 0.305 ac, 50.99% Impervious, Inflow Depth = 3.93" for 10-Year-2020 event Inflow = 1.51 cfs @ 12.09 hrs, Volume= 0.100 af Outflow = 0.83 cfs @ 12.11 hrs, Volume= 0.100 af, Atten= 45%, Lag= 1.2 min Discarded = 0.02 cfs @ 12.11 hrs, Volume= 0.032 af Primary = 0.80 cfs @ 12.11 hrs, Volume= 0.068 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= 564.88' @ 12.11 hrs Surf.Area= 1,086 sf Storage= 1,399 cf Plug-Flow detention time= 123.8 min calculated for 0.100 af (100% of inflow) Center-of-Mass det. time= 123.8 min ( 923.6 - 799.8 ) 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=564.88' (Free Discharge) 1=Exfiltration ( Controls 0.02 cfs) Primary OutFlow Max=0.80 cfs @ 12.11 hrs HW=564.88' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.17 cfs @ 5.11 fps) 3=Orifice/Grate (Orifice Controls 0.55 cfs @ 2.78 fps) 4=Orifice/Grate (Orifice Controls 0.08 cfs @ 1.45 fps) 5=Broad-Crested Rectangular Weir ( 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 40 Pond 12P: Front Yard Basin Hydrograph 1.51 cfs Inflow Outflow Inflow Area=0.305 ac Discarded Primary Peak Elev=564.88' Storage=1,399 cf 0.83 cfs 1 Flow (cfs) 0.80 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 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 41 Summary for Pond 12P: Front Yard Basin Inflow Area = 0.305 ac, 50.99% Impervious, Inflow Depth = 7.60" for 100-Year-2020 event Inflow = 2.79 cfs @ 12.09 hrs, Volume= 0.193 af Outflow = 1.81 cfs @ 12.11 hrs, Volume= 0.193 af, Atten= 35%, Lag= 1.0 min Discarded = 0.02 cfs @ 12.11 hrs, Volume= 0.037 af Primary = 1.78 cfs @ 12.11 hrs, Volume= 0.157 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= 565.65' @ 12.11 hrs Surf.Area= 1,086 sf Storage= 1,988 cf Plug-Flow detention time= 86.4 min calculated for 0.193 af (100% of inflow) Center-of-Mass det. time= 86.5 min ( 866.4 - 779.9 ) 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=0.02 cfs @ 12.11 hrs HW=565.64' (Free Discharge) 1=Exfiltration ( Controls 0.02 cfs) Primary OutFlow Max=1.78 cfs @ 12.11 hrs HW=565.64' (Free Discharge) 2=Orifice/Grate (Orifice Controls 0.23 cfs @ 6.62 fps) 3=Orifice/Grate (Orifice Controls 0.99 cfs @ 5.04 fps) 4=Orifice/Grate (Orifice Controls 0.56 cfs @ 4.13 fps) 5=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)

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 42 Pond 12P: Front Yard Basin Hydrograph 2.79 cfs Inflow Outflow Inflow Area=0.305 ac Discarded Primary 3 Peak Elev=565.65' Storage=1,988 cf 1.81 cfs 2 1.78 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)