09 Stormwater Mgmt Report 122025

NJA230139 - REV 2 Printed 12/11/2025 Page 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# 1 2 3 4 Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) 2-Year-Future 10-Year-Future 100-Year-Future 25-Year-Future NOAA 24-hr NOAA 24-hr NOAA 24-hr NOAA 24-hr D D D D Default Default Default Default 24.00 24.00 24.00 24.00 1 1 1 1 4.09 6.37 11.52 8.02 AMC 2 2 2 2 P2 (inches) 4.09 4.09 4.09 3.47

NJA230139 - REV 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 4,792 165,528 170,320 39 98 96 >75% Grass cover, Good, HSG A (E1p, P1p) Paved parking, HSG A (E1i, P1i, P1i(pp)) TOTAL AREA Printed 12/11/2025 Page 3

NJA230139 - REV 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 170,320 0 0 0 0 170,320 HSG A HSG B HSG C HSG D Other E1i, E1p, P1i, P1i(pp), P1p TOTAL AREA Printed 12/11/2025 Page 4

NJA230139 - REV 2 Printed 12/11/2025 Page 5 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Ground Covers (all nodes) HSG-A (sq-ft) HSG-B (sq-ft) HSG-C (sq-ft) HSG-D (sq-ft) Other (sq-ft) Total (sq-ft) Ground Cover 4,792 0 0 0 0 4,792 165,528 170,320 0 0 0 0 0 0 0 0 165,528 170,320 >75% Grass cover, Good Paved parking TOTAL AREA Su Nu

NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" NJA230139 - REV 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Printed 12/11/2025 Page 6 Time span=0.00-72.00 hrs, dt=0.10 hrs, 721 points x 9 Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv. Reach routing by Dyn-Stor-Ind method - Pond routing by Dyn-Stor-Ind method Runoff Area=1.930 ac 100.00% Impervious Runoff Depth=3.85" Flow Length=441' Tc=3.1 min CN=0/98 Runoff=7.52 cfs 27,007 cf Subcatchment E1i: Existing Impervious Runoff Area=0.020 ac 0.00% Impervious Runoff Depth=0.06" Flow Length=526' Tc=8.2 min CN=39/0 Runoff=0.00 cfs 4 cf Subcatchment E1p: Existing Pervious Subcatchment P1i: Proposed Impervious Runoff Area=1.600 ac 100.00% Impervious Runoff Depth=3.85" Flow Length=443' Tc=3.0 min CN=0/98 Runoff=6.24 cfs 22,389 cf Runoff Area=0.270 ac 100.00% Impervious Runoff Depth=3.85" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 Runoff=0.92 cfs 3,778 cf Subcatchment P1i(pp): Proposed Subcatchment P1p: Proposed Pervious Pond PP1: Pervious Pavement Runoff Area=0.090 ac 0.00% Impervious Runoff Depth=0.06" Flow Length=528' Tc=8.1 min CN=39/0 Runoff=0.00 cfs 18 cf Peak Elev=367.09' Storage=1,510 cf Inflow=0.92 cfs 3,778 cf Outflow=0.70 cfs 2,754 cf Link E1: EDA 1A Inflow=7.52 cfs 27,011 cf Primary=7.52 cfs 27,011 cf Link P1: PDA 1A Inflow=6.91 cfs 25,161 cf Primary=6.91 cfs 25,161 cf Total Runoff Area = 170,320 sf Runoff Volume = 53,197 cf Average Runoff Depth = 3.75" 2.81% Pervious = 4,792 sf 97.19% Impervious = 165,528 sf

NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" NJA230139 - REV 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Printed 12/11/2025 Page 7 Summary for Subcatchment E1i: Existing Impervious Runoff = 7.52 cfs @ 12.09 hrs, Volume= Routed to Link E1 : EDA 1A 27,007 cf, Depth= 3.85" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.10 hrs NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" Area (ac) 1.930 1.930 CN 98 98 Description Paved parking, HSG A 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 100 0.0400 2.05 Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" 0.1 36 0.0400 4.06 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.1 285 0.0120 2.22 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.1 20 0.6600 4.06 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 3.1 441 Total Subcatchment E1i: Existing Impervious Hydrograph NOAA 24-hr D 2-Year-Future Rainfall=4.09" P2=4.09" Runoff Area=1.930 ac Runoff Volume=27,007 cf Runoff Depth=3.85" Flow Length=441' Tc=3.1 min CN=0/98 7 6 Flow (cfs) Runoff 7.52 cfs 8 5 4 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" NJA230139 - REV 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Printed 12/11/2025 Page 8 Summary for Subcatchment E1p: Existing Pervious Runoff = 0.00 cfs @ 16.78 hrs, Volume= Routed to Link E1 : EDA 1A 4 cf, Depth= 0.06" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.10 hrs NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" Area (ac) 0.020 0.020 CN 39 39 Description >75% Grass cover, Good, HSG A 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.3 85 0.0500 0.27 Sheet Flow, Grass: Short n= 0.150 P2= 4.09" 0.2 15 0.0400 1.40 Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" 0.5 121 0.0400 4.06 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.1 285 0.0120 2.22 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.1 20 0.6600 4.06 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 8.2 526 Total Subcatchment E1p: Existing Pervious Hydrograph 0.000 0.000 NOAA 24-hr D 2-Year-Future Rainfall=4.09" P2=4.09" Runoff Area=0.020 ac Runoff Volume=4 cf Runoff Depth=0.06" Flow Length=526' Tc=8.2 min CN=39/0 0.000 0.000 0 Flow (cfs) Runoff 0.00 cfs 0 0 0 0 0 0 0 0 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" NJA230139 - REV 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Printed 12/11/2025 Page 9 Summary for Subcatchment P1i: Proposed Impervious Runoff = 6.24 cfs @ 12.09 hrs, Volume= Routed to Link P1 : PDA 1A 22,389 cf, Depth= 3.85" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.10 hrs NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" Area (ac) 1.600 1.600 CN 98 98 Description Paved parking, HSG A 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.8 100 0.0400 2.05 Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" 0.1 36 0.0400 4.06 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.0 287 0.0140 2.40 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.1 20 0.6600 4.06 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 3.0 443 Total Subcatchment P1i: Proposed Impervious Hydrograph Runoff 6.24 cfs NOAA 24-hr D 2-Year-Future Rainfall=4.09" P2=4.09" Runoff Area=1.600 ac Runoff Volume=22,389 cf Runoff Depth=3.85" Flow Length=443' Tc=3.0 min CN=0/98 6 Flow (cfs) 5 4 3 2 1 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" NJA230139 - REV 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Printed 12/11/2025 Page 10 Summary for Subcatchment P1i(pp): Proposed Impervious Runoff = 0.92 cfs @ 12.04 hrs, Volume= Routed to Pond PP1 : Pervious Pavement 3,778 cf, Depth= 3.85" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.10 hrs NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" Area (ac) 0.270 0.270 CN 98 98 Description Paved parking, HSG A 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 0.5 30 0.0150 1.09 Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" Subcatchment P1i(pp): Proposed Impervious Hydrograph 1 Runoff 0.92 cfs Flow (cfs) NOAA 24-hr D 2-Year-Future Rainfall=4.09" P2=4.09" Runoff Area=0.270 ac Runoff Volume=3,778 cf Runoff Depth=3.85" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)

NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" NJA230139 - REV 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Printed 12/11/2025 Page 11 Summary for Subcatchment P1p: Proposed Pervious Runoff = 0.00 cfs @ 16.78 hrs, Volume= Routed to Link P1 : PDA 1A 18 cf, Depth= 0.06" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-72.00 hrs, dt= 0.10 hrs NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" Area (ac) 0.090 0.090 CN 39 39 Description >75% Grass cover, Good, HSG A 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 5.3 85 0.0500 0.27 Sheet Flow, Grass: Short n= 0.150 P2= 4.09" 0.2 15 0.0400 1.40 Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" 0.5 121 0.0400 4.06 Shallow Concentrated Flow, Paved Kv= 20.3 fps 2.0 287 0.0140 2.40 Shallow Concentrated Flow, Paved Kv= 20.3 fps 0.1 20 0.6600 4.06 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 8.1 528 Total Subcatchment P1p: Proposed Pervious Hydrograph 0.001 Runoff 0.00 cfs 0.001 NOAA 24-hr D 2-Year-Future Rainfall=4.09" P2=4.09" Runoff Area=0.090 ac Runoff Volume=18 cf Runoff Depth=0.06" Flow Length=528' Tc=8.1 min CN=39/0 0.001 0.000 Flow (cfs) 0.000 0.000 0.000 0.000 0.000 0.000 0 0 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 Time (hours)