09 Stormwater Mgmt Report 122025

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 12 Summary for Pond PP1: Pervious Pavement Inflow Area = 11,761 sf,100.00% Impervious, Inflow Depth = 3.85" for 2-Year-Future event Inflow = 0.92 cfs @ 12.04 hrs, Volume= 3,778 cf Outflow = 0.70 cfs @ 12.13 hrs, Volume= 2,754 cf, Atten= 24%, Lag= 5.5 min Primary = 0.70 cfs @ 12.13 hrs, Volume= 2,754 cf Routed to Link P1 : PDA 1A Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.10 hrs / 9 Peak Elev= 367.09' @ 12.13 hrs Surf.Area= 8,538 sf Storage= 1,510 cf Plug-Flow detention time= 208.0 min calculated for 2,754 cf (73% of inflow) Center-of-Mass det. time= 108.1 min ( 856.1 - 748.0 ) Volume #1 Invert 366.65' Elevation (feet) 366.65 367.65 Avail.Storage 3,415 cf Surf.Area (sq-ft) 8,538 8,538 Device #1 Routing Primary Invert 365.50' #2 Device 1 366.95' Storage Description Custom Stage Data (Prismatic)Listed below (Recalc) 8,538 cf Overall x 40.0% Voids Inc.Store (cubic-feet) 0 8,538 Cum.Store (cubic-feet) 0 8,538 Outlet Devices 15.0" Round RCP_Round 15" L= 273.0' RCP, groove end projecting, Ke= 0.200 Inlet / Outlet Invert= 365.50' / 364.15' S= 0.0049 '/' Cc= 0.900 n= 0.011 Concrete pipe, straight & clean, Flow Area= 1.23 sf 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.67 cfs @ 12.13 hrs HW=367.09' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 0.67 cfs of 5.71 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 0.67 cfs @ 1.22 fps)

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 13 Pond PP1: Pervious Pavement Hydrograph 1 Inflow Primary 0.92 cfs Flow (cfs) 0.70 cfs Inflow Area=11,761 sf Peak Elev=367.09' Storage=1,510 cf 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 14 Summary for Link E1: EDA 1A Inflow Area = Inflow = Primary = 84,942 sf, 98.97% Impervious, Inflow Depth = 3.82" for 2-Year-Future event 7.52 cfs @ 12.09 hrs, Volume= 27,011 cf 7.52 cfs @ 12.09 hrs, Volume= 27,011 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.10 hrs Link E1: EDA 1A Hydrograph 8 7.52 cfs 7.52 cfs Inflow Primary Inflow Area=84,942 sf 7 Flow (cfs) 6 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 15 Summary for Link P1: PDA 1A Inflow Area = Inflow = Primary = 85,378 sf, 95.41% Impervious, Inflow Depth = 3.54" for 2-Year-Future event 6.91 cfs @ 12.09 hrs, Volume= 25,161 cf 6.91 cfs @ 12.09 hrs, Volume= 25,161 cf, Atten= 0%, Lag= 0.0 min Primary outflow = Inflow, Time Span= 0.00-72.00 hrs, dt= 0.10 hrs Link P1: PDA 1A Hydrograph 6.91 cfs 6.91 cfs 7 Inflow Primary Inflow Area=85,378 sf 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 10-Year-Future Rainfall=6.37", 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 16 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=6.13" Flow Length=441' Tc=3.1 min CN=0/98 Runoff=11.76 cfs 42,957 cf Subcatchment E1i: Existing Impervious Runoff Area=0.020 ac 0.00% Impervious Runoff Depth=0.56" Flow Length=526' Tc=8.2 min CN=39/0 Runoff=0.00 cfs 40 cf Subcatchment E1p: Existing Pervious Subcatchment P1i: Proposed Impervious Runoff Area=1.600 ac 100.00% Impervious Runoff Depth=6.13" Flow Length=443' Tc=3.0 min CN=0/98 Runoff=9.76 cfs 35,612 cf Runoff Area=0.270 ac 100.00% Impervious Runoff Depth=6.13" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 Runoff=1.43 cfs 6,009 cf Subcatchment P1i(pp): Proposed Subcatchment P1p: Proposed Pervious Pond PP1: Pervious Pavement Runoff Area=0.090 ac 0.00% Impervious Runoff Depth=0.56" Flow Length=528' Tc=8.1 min CN=39/0 Runoff=0.02 cfs 182 cf Peak Elev=367.15' Storage=1,706 cf Inflow=1.43 cfs 6,009 cf Outflow=1.15 cfs 4,985 cf Link E1: EDA 1A Inflow=11.76 cfs 42,997 cf Primary=11.76 cfs 42,997 cf Link P1: PDA 1A Inflow=10.89 cfs 40,778 cf Primary=10.89 cfs 40,778 cf Total Runoff Area = 170,320 sf Runoff Volume = 84,800 cf Average Runoff Depth = 5.97" 2.81% Pervious = 4,792 sf 97.19% Impervious = 165,528 sf

NOAA 24-hr D 10-Year-Future Rainfall=6.37", 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 17 Summary for Subcatchment E1i: Existing Impervious Runoff = 11.76 cfs @ 12.09 hrs, Volume= Routed to Link E1 : EDA 1A 42,957 cf, Depth= 6.13" 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 10-Year-Future Rainfall=6.37", 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 13 12 NOAA 24-hr D 10-Year-Future Rainfall=6.37" P2=4.09" Runoff Area=1.930 ac Runoff Volume=42,957 cf Runoff Depth=6.13" Flow Length=441' Tc=3.1 min CN=0/98 11 10 9 8 Flow (cfs) Runoff 11.76 cfs 7 6 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 10-Year-Future Rainfall=6.37", 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 18 Summary for Subcatchment E1p: Existing Pervious Runoff = 0.00 cfs @ 12.25 hrs, Volume= Routed to Link E1 : EDA 1A 40 cf, Depth= 0.56" 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 10-Year-Future Rainfall=6.37", 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 Flow (cfs) Hydrograph 0.005 0.005 0.004 0.004 0.004 0.004 0.004 0.003 0.003 0.003 0.003 0.003 0.002 0.002 0.002 0.002 0.002 0.001 0.001 0.001 0.001 0.001 0.000 0.000 0 Runoff 0.00 cfs NOAA 24-hr D 10-Year-Future Rainfall=6.37" P2=4.09" Runoff Area=0.020 ac Runoff Volume=40 cf Runoff Depth=0.56" Flow Length=526' Tc=8.2 min CN=39/0 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 10-Year-Future Rainfall=6.37", 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 19 Summary for Subcatchment P1i: Proposed Impervious Runoff = 9.76 cfs @ 12.08 hrs, Volume= Routed to Link P1 : PDA 1A 35,612 cf, Depth= 6.13" 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 10-Year-Future Rainfall=6.37", 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 9.76 cfs 10 NOAA 24-hr D 10-Year-Future Rainfall=6.37" P2=4.09" Runoff Area=1.600 ac Runoff Volume=35,612 cf Runoff Depth=6.13" Flow Length=443' Tc=3.0 min CN=0/98 9 8 Flow (cfs) 7 6 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 10-Year-Future Rainfall=6.37", 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 20 Summary for Subcatchment P1i(pp): Proposed Impervious Runoff = 1.43 cfs @ 12.04 hrs, Volume= Routed to Pond PP1 : Pervious Pavement 6,009 cf, Depth= 6.13" 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 10-Year-Future Rainfall=6.37", 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 Runoff 1.43 cfs NOAA 24-hr D 10-Year-Future Rainfall=6.37" P2=4.09" Runoff Area=0.270 ac Runoff Volume=6,009 cf Runoff Depth=6.13" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 Flow (cfs) 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 10-Year-Future Rainfall=6.37", 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 21 Summary for Subcatchment P1p: Proposed Pervious Runoff = 0.02 cfs @ 12.25 hrs, Volume= Routed to Link P1 : PDA 1A 182 cf, Depth= 0.56" 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 10-Year-Future Rainfall=6.37", 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 Flow (cfs) Hydrograph Runoff 0.02 cfs 0.021 0.02 0.019 0.018 0.017 0.016 0.015 0.014 0.013 0.012 0.011 0.01 0.009 0.008 0.007 0.006 0.005 0.004 0.003 0.002 0.001 0 NOAA 24-hr D 10-Year-Future Rainfall=6.37" P2=4.09" Runoff Area=0.090 ac Runoff Volume=182 cf Runoff Depth=0.56" Flow Length=528' Tc=8.1 min CN=39/0 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)