21 Stormwater Mgmt Report_082025

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 32 Summary for Pond PP1: Pervious Pavement Inflow Area = 11,761 sf,100.00% Impervious, Inflow Depth = 11.28" for 100-Year-Future event Inflow = 2.60 cfs @ 12.04 hrs, Volume= 11,054 cf Outflow = 2.20 cfs @ 12.11 hrs, Volume= 10,030 cf, Atten= 15%, Lag= 4.4 min Primary = 2.20 cfs @ 12.11 hrs, Volume= 10,030 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= 367.26' @ 12.11 hrs Surf.Area= 8,538 sf Storage= 2,077 cf Plug-Flow detention time= 116.8 min calculated for 10,030 cf (91% of inflow) Center-of-Mass det. time= 63.9 min ( 796.6 - 732.7 ) 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=2.16 cfs @ 12.11 hrs HW=367.25' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 2.16 cfs of 5.59 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 2.16 cfs @ 1.80 fps)

NJA230139 - REV 0 NOAA 24-hr D 100-Year-Future Rainfall=11.52", P2=4.09" Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 33 Pond PP1: Pervious Pavement Hydrograph Inflow Primary 2.60 cfs 2.20 cfs Flow (cfs) 2 Inflow Area=11,761 sf Peak Elev=367.26' Storage=2,077 cf 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 100-Year-Future Rainfall=11.52", P2=4.09" Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 34 Summary for Link E1: EDA 1A Inflow Area = Inflow = Primary = 59,242 sf, 98.53% Impervious, Inflow Depth = 11.16" for 100-Year-Future event 14.84 cfs @ 12.09 hrs, Volume= 55,074 cf 14.84 cfs @ 12.09 hrs, Volume= 55,074 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 14.84 cfs 14.84 cfs 16 15 Inflow Primary Inflow Area=59,242 sf 14 13 12 Flow (cfs) 11 10 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)

NJA230139 - REV 0 NOAA 24-hr D 100-Year-Future Rainfall=11.52", P2=4.09" Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 35 Summary for Link P1: PDA 1A Inflow Area = Inflow = Primary = 59,242 sf, 93.38% Impervious, Inflow Depth = 10.52" for 100-Year-Future event 13.41 cfs @ 12.09 hrs, Volume= 51,929 cf 13.41 cfs @ 12.09 hrs, Volume= 51,929 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 15 13.41 cfs 13.41 cfs 14 13 Inflow Primary Inflow Area=59,242 sf 12 11 Flow (cfs) 10 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 25-Year-Future Rainfall=8.02", P2=3.47" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 36 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=7.78" Flow Length=441' Tc=3.2 min CN=0/98 Runoff=10.29 cfs 37,844 cf Subcatchment E1i: Existing Impervious Subcatchment E1p: Existing Pervious Runoff Area=0.020 ac 0.00% Impervious Runoff Depth=1.17" Flow Length=526' Tc=8.6 min CN=39/0 Runoff=0.02 cfs 85 cf Subcatchment P1i: Proposed Impervious Runoff Area=1.000 ac 100.00% Impervious Runoff Depth=7.78" Flow Length=443' Tc=3.1 min CN=0/98 Runoff=7.68 cfs 28,242 cf Runoff Area=0.270 ac 100.00% Impervious Runoff Depth=7.78" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 Runoff=1.81 cfs 7,625 cf Subcatchment P1i(pp): Proposed Subcatchment P1p: Proposed Pervious Pond PP1: Pervious Pavement Runoff Area=0.090 ac 0.00% Impervious Runoff Depth=1.17" Flow Length=528' Tc=8.5 min CN=39/0 Runoff=0.07 cfs 381 cf Peak Elev=367.19' Storage=1,832 cf Inflow=1.81 cfs 7,625 cf Outflow=1.49 cfs 6,601 cf Link E1: EDA 1A Inflow=10.30 cfs 37,929 cf Primary=10.30 cfs 37,929 cf Link P1: PDA 1A Inflow=9.18 cfs 35,224 cf Primary=9.18 cfs 35,224 cf Total Runoff Area = 118,483 sf Runoff Volume = 74,177 cf Average Runoff Depth = 7.51" 4.04% Pervious = 4,792 sf 95.96% Impervious = 113,692 sf

NOAA 24-hr D 25-Year-Future Rainfall=8.02", P2=3.47" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 37 Summary for Subcatchment E1i: Existing Impervious Runoff = 10.29 cfs @ 12.09 hrs, Volume= Routed to Link E1 : EDA 1A 37,844 cf, Depth= 7.78" 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 25-Year-Future Rainfall=8.02", P2=3.47" Area (ac) 1.340 1.340 CN 98 98 Tc Length (min) (feet) 0.9 100 Description Paved parking, HSG A 100.00% Impervious Area Slope (ft/ft) 0.0400 Velocity (ft/sec) 1.89 0.1 36 0.0400 4.06 2.1 285 0.0120 2.22 0.1 20 0.6600 4.06 3.2 441 Total Capacity (cfs) Description Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 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 11 NOAA 24-hr D 25-Year-Future Rainfall=8.02" P2=3.47" Runoff Area=1.340 ac Runoff Volume=37,844 cf Runoff Depth=7.78" Flow Length=441' Tc=3.2 min CN=0/98 10 9 8 7 Flow (cfs) Runoff 10.29 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 25-Year-Future Rainfall=8.02", P2=3.47" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 38 Summary for Subcatchment E1p: Existing Pervious Runoff = 0.02 cfs @ 12.21 hrs, Volume= Routed to Link E1 : EDA 1A 85 cf, Depth= 1.17" 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 25-Year-Future Rainfall=8.02", P2=3.47" Area (ac) 0.020 0.020 CN 39 39 Tc Length (min) (feet) 5.7 85 Description >75% Grass cover, Good, HSG A 100.00% Pervious Area Slope (ft/ft) 0.0500 Velocity (ft/sec) 0.25 0.2 15 0.0400 1.29 0.5 121 0.0400 4.06 2.1 285 0.0120 2.22 0.1 20 0.6600 4.06 8.6 526 Total Capacity (cfs) Description Sheet Flow, Grass: Short n= 0.150 P2= 3.47" Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 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 0.018 0.017 0.016 0.015 0.014 0.013 0.012 Flow (cfs) 0.011 0.01 0.009 0.008 0.007 0.006 Runoff 0.02 cfs NOAA 24-hr D 25-Year-Future Rainfall=8.02" P2=3.47" Runoff Area=0.020 ac Runoff Volume=85 cf Runoff Depth=1.17" Flow Length=526' Tc=8.6 min CN=39/0 0.005 0.004 0.003 0.002 0.001 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 25-Year-Future Rainfall=8.02", P2=3.47" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 39 Summary for Subcatchment P1i: Proposed Impervious Runoff = 7.68 cfs @ 12.09 hrs, Volume= Routed to Link P1 : PDA 1A 28,242 cf, Depth= 7.78" 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 25-Year-Future Rainfall=8.02", P2=3.47" Area (ac) 1.000 1.000 CN 98 98 Tc Length (min) (feet) 0.9 100 Description Paved parking, HSG A 100.00% Impervious Area Slope (ft/ft) 0.0400 Velocity (ft/sec) 1.89 0.1 36 0.0400 4.06 2.0 287 0.0140 2.40 0.1 20 0.6600 4.06 3.1 443 Total Capacity (cfs) Description Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 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 NOAA 24-hr D 25-Year-Future Rainfall=8.02" P2=3.47" Runoff Area=1.000 ac Runoff Volume=28,242 cf Runoff Depth=7.78" Flow Length=443' Tc=3.1 min CN=0/98 7 6 Flow (cfs) Runoff 7.68 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 25-Year-Future Rainfall=8.02", P2=3.47" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 40 Summary for Subcatchment P1i(pp): Proposed Impervious Runoff = 1.81 cfs @ 12.04 hrs, Volume= Routed to Pond PP1 : Pervious Pavement 7,625 cf, Depth= 7.78" 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 25-Year-Future Rainfall=8.02", P2=3.47" 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) 1.00 Capacity (cfs) Description Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" Subcatchment P1i(pp): Proposed Impervious Hydrograph 2 Runoff Flow (cfs) 1.81 cfs NOAA 24-hr D 25-Year-Future Rainfall=8.02" P2=3.47" Runoff Area=0.270 ac Runoff Volume=7,625 cf Runoff Depth=7.78" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 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 25-Year-Future Rainfall=8.02", P2=3.47" NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 41 Summary for Subcatchment P1p: Proposed Pervious Runoff = 0.07 cfs @ 12.21 hrs, Volume= Routed to Link P1 : PDA 1A 381 cf, Depth= 1.17" 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 25-Year-Future Rainfall=8.02", P2=3.47" Area (ac) 0.090 0.090 CN 39 39 Tc Length (min) (feet) 5.7 85 Description >75% Grass cover, Good, HSG A 100.00% Pervious Area Slope (ft/ft) 0.0500 Velocity (ft/sec) 0.25 0.2 15 0.0400 1.29 0.5 121 0.0400 4.06 2.0 287 0.0140 2.40 0.1 20 0.6600 4.06 8.5 528 Total Capacity (cfs) Description Sheet Flow, Grass: Short n= 0.150 P2= 3.47" Sheet Flow, Smooth surfaces n= 0.011 P2= 3.47" 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 Hydrograph 0.08 0.075 0.07 0.065 0.06 0.055 Flow (cfs) 0.05 0.045 0.04 0.035 0.03 Runoff 0.07 cfs NOAA 24-hr D 25-Year-Future Rainfall=8.02" P2=3.47" Runoff Area=0.090 ac Runoff Volume=381 cf Runoff Depth=1.17" Flow Length=528' Tc=8.5 min CN=39/0 0.025 0.02 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)