21 Stormwater Mgmt Report_082025

NOAA 24-hr D 10-Year-Future Rainfall=6.37", P2=4.09" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 22 Summary for Pond PP1: Pervious Pavement Inflow Area = 11,761 sf,100.00% Impervious, Inflow Depth = 6.13" for 10-Year-Future event Inflow = 1.43 cfs @ 12.04 hrs, Volume= 6,009 cf Outflow = 1.15 cfs @ 12.12 hrs, Volume= 4,985 cf, Atten= 19%, Lag= 4.9 min Primary = 1.15 cfs @ 12.12 hrs, Volume= 4,985 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= 367.15' @ 12.12 hrs Surf.Area= 8,538 sf Storage= 1,706 cf Plug-Flow detention time= 163.5 min calculated for 4,978 cf (83% of inflow) Center-of-Mass det. time= 87.5 min ( 827.7 - 740.2 ) 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=1.12 cfs @ 12.12 hrs HW=367.15' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 1.12 cfs of 5.64 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 1.12 cfs @ 1.45 fps)

NJA230139 - REV 0 NOAA 24-hr D 10-Year-Future Rainfall=6.37", P2=4.09" Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 23 Pond PP1: Pervious Pavement Hydrograph Inflow Primary 1.43 cfs 1.15 cfs Inflow Area=11,761 sf Peak Elev=367.15' Storage=1,706 cf 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)

NJA230139 - REV 0 NOAA 24-hr D 10-Year-Future Rainfall=6.37", P2=4.09" Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 24 Summary for Link E1: EDA 1A Inflow Area = Inflow = Primary = 59,242 sf, 98.53% Impervious, Inflow Depth = 6.05" for 10-Year-Future event 8.17 cfs @ 12.09 hrs, Volume= 29,865 cf 8.17 cfs @ 12.09 hrs, Volume= 29,865 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 9 8 8.17 cfs 8.17 cfs Inflow Primary Inflow Area=59,242 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)

NJA230139 - REV 0 NOAA 24-hr D 10-Year-Future Rainfall=6.37", P2=4.09" Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 25 Summary for Link P1: PDA 1A Inflow Area = Inflow = Primary = 59,242 sf, 93.38% Impervious, Inflow Depth = 5.56" for 10-Year-Future event 7.23 cfs @ 12.09 hrs, Volume= 27,424 cf 7.23 cfs @ 12.09 hrs, Volume= 27,424 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 8 7 7.23 cfs 7.23 cfs Inflow Primary Inflow Area=59,242 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 100-Year-Future Rainfall=11.52", P2=4.09" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 26 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=1.340 ac 100.00% Impervious Runoff Depth=11.28" Flow Length=441' Tc=3.1 min CN=0/98 Runoff=14.80 cfs 54,862 cf Subcatchment E1i: Existing Impervious Runoff Area=0.020 ac 0.00% Impervious Runoff Depth=2.93" Flow Length=526' Tc=8.2 min CN=39/0 Runoff=0.05 cfs 213 cf Subcatchment E1p: Existing Pervious Subcatchment P1i: Proposed Impervious Runoff Area=1.000 ac 100.00% Impervious Runoff Depth=11.28" Flow Length=443' Tc=3.0 min CN=0/98 Runoff=11.05 cfs 40,942 cf Runoff Area=0.270 ac 100.00% Impervious Runoff Depth=11.28" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 Runoff=2.60 cfs 11,054 cf Subcatchment P1i(pp): Proposed Subcatchment P1p: Proposed Pervious Pond PP1: Pervious Pavement Runoff Area=0.090 ac 0.00% Impervious Runoff Depth=2.93" Flow Length=528' Tc=8.1 min CN=39/0 Runoff=0.23 cfs 957 cf Peak Elev=367.26' Storage=2,077 cf Inflow=2.60 cfs 11,054 cf Outflow=2.20 cfs 10,030 cf Link E1: EDA 1A Inflow=14.84 cfs 55,074 cf Primary=14.84 cfs 55,074 cf Link P1: PDA 1A Inflow=13.41 cfs 51,929 cf Primary=13.41 cfs 51,929 cf Total Runoff Area = 118,483 sf Runoff Volume = 108,028 cf Average Runoff Depth = 10.94" 4.04% Pervious = 4,792 sf 95.96% Impervious = 113,692 sf

NOAA 24-hr D 100-Year-Future Rainfall=11.52", P2=4.09" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 27 Summary for Subcatchment E1i: Existing Impervious Runoff = 14.80 cfs @ 12.09 hrs, Volume= Routed to Link E1 : EDA 1A 54,862 cf, Depth=11.28" 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 100-Year-Future Rainfall=11.52", P2=4.09" Area (ac) 1.340 1.340 CN 98 98 Tc Length (min) (feet) 0.8 100 Description Paved parking, HSG A 100.00% Impervious Area Slope (ft/ft) 0.0400 Velocity (ft/sec) 2.05 0.1 36 0.0400 4.06 2.1 285 0.0120 2.22 0.1 20 0.6600 4.06 3.1 441 Total Capacity (cfs) Description Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Woodland Kv= 5.0 fps Subcatchment E1i: Existing Impervious Hydrograph 16 15 NOAA 24-hr D 100-Year-Future Rainfall=11.52" P2=4.09" Runoff Area=1.340 ac Runoff Volume=54,862 cf Runoff Depth=11.28" Flow Length=441' Tc=3.1 min CN=0/98 14 13 12 11 10 Flow (cfs) Runoff 14.80 cfs 9 8 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 100-Year-Future Rainfall=11.52", P2=4.09" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 28 Summary for Subcatchment E1p: Existing Pervious Runoff = 0.05 cfs @ 12.18 hrs, Volume= Routed to Link E1 : EDA 1A 213 cf, Depth= 2.93" 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 100-Year-Future Rainfall=11.52", P2=4.09" Area (ac) 0.020 0.020 CN 39 39 Tc Length (min) (feet) 5.3 85 Description >75% Grass cover, Good, HSG A 100.00% Pervious Area Slope (ft/ft) 0.0500 Velocity (ft/sec) 0.27 0.2 15 0.0400 1.40 0.5 121 0.0400 4.06 2.1 285 0.0120 2.22 0.1 20 0.6600 4.06 8.2 526 Total Capacity (cfs) Description Sheet Flow, Grass: Short n= 0.150 P2= 4.09" Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Woodland Kv= 5.0 fps Subcatchment E1p: Existing Pervious Hydrograph 0.055 0.05 0.045 0.04 Flow (cfs) 0.035 0.03 0.025 0.02 Runoff 0.05 cfs NOAA 24-hr D 100-Year-Future Rainfall=11.52" P2=4.09" Runoff Area=0.020 ac Runoff Volume=213 cf Runoff Depth=2.93" Flow Length=526' Tc=8.2 min CN=39/0 0.015 0.01 0.005 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 100-Year-Future Rainfall=11.52", P2=4.09" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 29 Summary for Subcatchment P1i: Proposed Impervious Runoff = 11.05 cfs @ 12.08 hrs, Volume= Routed to Link P1 : PDA 1A 40,942 cf, Depth=11.28" 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 100-Year-Future Rainfall=11.52", P2=4.09" Area (ac) 1.000 1.000 CN 98 98 Tc Length (min) (feet) 0.8 100 Description Paved parking, HSG A 100.00% Impervious Area Slope (ft/ft) 0.0400 Velocity (ft/sec) 2.05 0.1 36 0.0400 4.06 2.0 287 0.0140 2.40 0.1 20 0.6600 4.06 3.0 443 Total Capacity (cfs) Description Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Woodland Kv= 5.0 fps Subcatchment P1i: Proposed Impervious Hydrograph 12 NOAA 24-hr D 100-Year-Future Rainfall=11.52" P2=4.09" Runoff Area=1.000 ac Runoff Volume=40,942 cf Runoff Depth=11.28" Flow Length=443' Tc=3.0 min CN=0/98 11 10 9 8 Flow (cfs) Runoff 11.05 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 100-Year-Future Rainfall=11.52", P2=4.09" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 30 Summary for Subcatchment P1i(pp): Proposed Impervious Runoff = 2.60 cfs @ 12.04 hrs, Volume= Routed to Pond PP1 : Pervious Pavement 11,054 cf, Depth=11.28" 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 100-Year-Future Rainfall=11.52", P2=4.09" Area (ac) 0.270 0.270 CN 98 98 Tc Length (min) (feet) 0.5 30 Description Paved parking, HSG A 100.00% Impervious Area Slope (ft/ft) 0.0150 Velocity (ft/sec) 1.09 Capacity (cfs) Description Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" Subcatchment P1i(pp): Proposed Impervious Hydrograph Runoff 2.60 cfs NOAA 24-hr D 100-Year-Future Rainfall=11.52" P2=4.09" Runoff Area=0.270 ac Runoff Volume=11,054 cf Runoff Depth=11.28" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 Flow (cfs) 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 100-Year-Future Rainfall=11.52", P2=4.09" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 31 Summary for Subcatchment P1p: Proposed Pervious Runoff = 0.23 cfs @ 12.18 hrs, Volume= Routed to Link P1 : PDA 1A 957 cf, Depth= 2.93" 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 100-Year-Future Rainfall=11.52", P2=4.09" Area (ac) 0.090 0.090 CN 39 39 Tc Length (min) (feet) 5.3 85 Description >75% Grass cover, Good, HSG A 100.00% Pervious Area Slope (ft/ft) 0.0500 Velocity (ft/sec) 0.27 0.2 15 0.0400 1.40 0.5 121 0.0400 4.06 2.0 287 0.0140 2.40 0.1 20 0.6600 4.06 8.1 528 Total Capacity (cfs) Description Sheet Flow, Grass: Short n= 0.150 P2= 4.09" Sheet Flow, Smooth surfaces n= 0.011 P2= 4.09" Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps Shallow Concentrated Flow, Woodland Kv= 5.0 fps Subcatchment P1p: Proposed Pervious Flow (cfs) Hydrograph 0.26 0.25 0.24 0.23 0.22 0.21 0.2 0.19 0.18 0.17 0.16 0.15 0.14 0.13 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 0.01 0 Runoff 0.23 cfs NOAA 24-hr D 100-Year-Future Rainfall=11.52" P2=4.09" Runoff Area=0.090 ac Runoff Volume=957 cf Runoff Depth=2.93" 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)