09 Stormwater Mgmt Report 122025

E1i E1p P1i(pp) P1i P1p Existing Impervious Existing Pervious Proposed Impervious Proposed Impervious Proposed Pervious PP1 Pervious Pavement Subcat E1 P1 EDA 1A PDA 1A Reach Pond Link Routing Diagram for NJA230139 - REV 2 Prepared by Bohler Engineering, PC, Printed 12/11/2025 HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC

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 Event Name Storm Type Curve Mode Duration (hours) B/B 2-Year-Current 10-Year-Current 100-Year-Current NOAA 24-hr NOAA 24-hr NOAA 24-hr D D D Default Default Default 24.00 24.00 24.00 1 1 1 Depth (inches) 3.47 5.38 9.18 AMC 2 2 2 P2 (inches) 3.47 3.47 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-Current Rainfall=3.47", P2=3.47" 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=3.24" Flow Length=441' Tc=3.2 min CN=0/98 Runoff=6.36 cfs 22,675 cf Subcatchment E1i: Existing Impervious Runoff Area=0.020 ac 0.00% Impervious Runoff Depth=0.01" Flow Length=526' Tc=8.6 min CN=39/0 Runoff=0.00 cfs 1 cf Subcatchment E1p: Existing Pervious Subcatchment P1i: Proposed Impervious Runoff Area=1.600 ac 100.00% Impervious Runoff Depth=3.24" Flow Length=443' Tc=3.1 min CN=0/98 Runoff=5.27 cfs 18,798 cf Runoff Area=0.270 ac 100.00% Impervious Runoff Depth=3.24" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 Runoff=0.77 cfs 3,172 cf Subcatchment P1i(pp): Proposed Subcatchment P1p: Proposed Pervious Runoff Area=0.090 ac 0.00% Impervious Runoff Depth=0.01" Flow Length=528' Tc=8.5 min CN=39/0 Runoff=0.00 cfs 2 cf Pond PP1: Pervious Pavement Peak Elev=367.07' Storage=1,436 cf Inflow=0.77 cfs 3,172 cf Outflow=0.54 cfs 2,148 cf Link E1: EDA 1A Inflow=6.36 cfs 22,676 cf Primary=6.36 cfs 22,676 cf Link P1: PDA 1A Inflow=5.78 cfs 20,948 cf Primary=5.78 cfs 20,948 cf Total Runoff Area = 170,320 sf Runoff Volume = 44,648 cf Average Runoff Depth = 3.15" 2.81% Pervious = 4,792 sf 97.19% Impervious = 165,528 sf

NOAA 24-hr D 2-Year-Current Rainfall=3.47", P2=3.47" 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 = 6.36 cfs @ 12.09 hrs, Volume= Routed to Link E1 : EDA 1A 22,675 cf, Depth= 3.24" 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-Current Rainfall=3.47", P2=3.47" 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) 0.9 100 0.0400 1.89 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 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 3.2 441 Total Subcatchment E1i: Existing Impervious Hydrograph 7 NOAA 24-hr D 2-Year-Current Rainfall=3.47" P2=3.47" Runoff Area=1.930 ac Runoff Volume=22,675 cf Runoff Depth=3.24" Flow Length=441' Tc=3.2 min CN=0/98 6 5 Flow (cfs) Runoff 6.36 cfs 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-Current Rainfall=3.47", P2=3.47" 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 @ 24.00 hrs, Volume= Routed to Link E1 : EDA 1A 1 cf, Depth= 0.01" 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-Current Rainfall=3.47", P2=3.47" 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) 5.7 85 0.0500 0.25 Sheet Flow, Grass: Short n= 0.150 P2= 3.47" 0.2 15 0.0400 1.29 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 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 8.6 526 Total Subcatchment E1p: Existing Pervious Hydrograph NOAA 24-hr D 2-Year-Current Rainfall=3.47" P2=3.47" Runoff Area=0.020 ac Runoff Volume=1 cf Runoff Depth=0.01" Flow Length=526' Tc=8.6 min CN=39/0 0 0 0 0 0 0 Flow (cfs) Runoff 0.00 cfs 0 0 0 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-Current Rainfall=3.47", P2=3.47" 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 = 5.27 cfs @ 12.09 hrs, Volume= Routed to Link P1 : PDA 1A 18,798 cf, Depth= 3.24" 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-Current Rainfall=3.47", P2=3.47" 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) 0.9 100 0.0400 1.89 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 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 3.1 443 Total Subcatchment P1i: Proposed Impervious Hydrograph Runoff 5.27 cfs NOAA 24-hr D 2-Year-Current Rainfall=3.47" P2=3.47" Runoff Area=1.600 ac Runoff Volume=18,798 cf Runoff Depth=3.24" Flow Length=443' Tc=3.1 min CN=0/98 5 Flow (cfs) 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-Current Rainfall=3.47", P2=3.47" 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 = 0.77 cfs @ 12.04 hrs, Volume= Routed to Pond PP1 : Pervious Pavement 3,172 cf, Depth= 3.24" 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-Current Rainfall=3.47", P2=3.47" 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 1.00 Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" Subcatchment P1i(pp): Proposed Impervious Hydrograph 0.85 NOAA 24-hr D 2-Year-Current Rainfall=3.47" P2=3.47" Runoff Area=0.270 ac Runoff Volume=3,172 cf Runoff Depth=3.24" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 0.75 0.7 0.65 0.6 0.55 Flow (cfs) Runoff 0.77 cfs 0.8 0.5 0.45 0.4 0.35 0.3 0.25 0.2 0.15 0.1 0.05 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)