21 Stormwater Mgmt Report_082025

NOAA 24-hr D 10-Year-Current Rainfall=5.38", 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 21 Summary for Subcatchment P1p: Proposed Pervious Runoff = 0.01 cfs @ 12.60 hrs, Volume= Routed to Link P1 : PDA 1A 93 cf, Depth= 0.28" 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 10-Year-Current Rainfall=5.38", 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 0.005 0.005 0.004 0.004 Flow (cfs) 0.003 0.003 0.002 0.002 Runoff 0.01 cfs NOAA 24-hr D 10-Year-Current Rainfall=5.38" P2=3.47" Runoff Area=0.090 ac Runoff Volume=93 cf Runoff Depth=0.28" Flow Length=528' Tc=8.5 min CN=39/0 0.001 0.001 0.000 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-Current Rainfall=5.38", 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 22 Summary for Pond PP1: Pervious Pavement Inflow Area = 11,761 sf,100.00% Impervious, Inflow Depth = 5.14" for 10-Year-Current event Inflow = 1.21 cfs @ 12.04 hrs, Volume= 5,040 cf Outflow = 0.96 cfs @ 12.12 hrs, Volume= 4,016 cf, Atten= 21%, Lag= 5.1 min Primary = 0.96 cfs @ 12.12 hrs, Volume= 4,016 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= 367.13' @ 12.12 hrs Surf.Area= 8,538 sf Storage= 1,626 cf Plug-Flow detention time= 178.7 min calculated for 4,010 cf (80% of inflow) Center-of-Mass det. time= 94.7 min ( 837.6 - 742.9 ) 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=0.93 cfs @ 12.12 hrs HW=367.12' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 0.93 cfs of 5.69 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 0.93 cfs @ 1.36 fps)

NJA230139 - REV 0 NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" 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 1.21 cfs 0.96 cfs Flow (cfs) 1 Inflow Area=11,761 sf Peak Elev=367.13' Storage=1,626 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)

NJA230139 - REV 0 NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" 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 = 5.07" for 10-Year-Current event 6.89 cfs @ 12.09 hrs, Volume= 25,035 cf 6.89 cfs @ 12.09 hrs, Volume= 25,035 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 7 6.89 cfs 6.89 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)

NJA230139 - REV 0 NOAA 24-hr D 10-Year-Current Rainfall=5.38", P2=3.47" 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 = 4.61" for 10-Year-Current event 6.07 cfs @ 12.09 hrs, Volume= 22,776 cf 6.07 cfs @ 12.09 hrs, Volume= 22,776 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 6.07 cfs 6.07 cfs 6 Inflow Primary Inflow Area=59,242 sf 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-Current Rainfall=9.18", 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 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=8.94" Flow Length=441' Tc=3.2 min CN=0/98 Runoff=11.78 cfs 43,484 cf Subcatchment E1i: Existing Impervious Subcatchment E1p: Existing Pervious Runoff Area=0.020 ac 0.00% Impervious Runoff Depth=1.69" Flow Length=526' Tc=8.6 min CN=39/0 Runoff=0.03 cfs 123 cf Subcatchment P1i: Proposed Impervious Runoff Area=1.000 ac 100.00% Impervious Runoff Depth=8.94" Flow Length=443' Tc=3.1 min CN=0/98 Runoff=8.80 cfs 32,451 cf Runoff Area=0.270 ac 100.00% Impervious Runoff Depth=8.94" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 Runoff=2.07 cfs 8,762 cf Subcatchment P1i(pp): Proposed Subcatchment P1p: Proposed Pervious Pond PP1: Pervious Pavement Runoff Area=0.090 ac 0.00% Impervious Runoff Depth=1.69" Flow Length=528' Tc=8.5 min CN=39/0 Runoff=0.12 cfs 552 cf Peak Elev=367.21' Storage=1,916 cf Inflow=2.07 cfs 8,762 cf Outflow=1.72 cfs 7,737 cf Link E1: EDA 1A Inflow=11.80 cfs 43,606 cf Primary=11.80 cfs 43,606 cf Link P1: PDA 1A Inflow=10.58 cfs 40,739 cf Primary=10.58 cfs 40,739 cf Total Runoff Area = 118,483 sf Runoff Volume = 85,370 cf Average Runoff Depth = 8.65" 4.04% Pervious = 4,792 sf 95.96% Impervious = 113,692 sf

NOAA 24-hr D 100-Year-Current Rainfall=9.18", 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 27 Summary for Subcatchment E1i: Existing Impervious Runoff = 11.78 cfs @ 12.09 hrs, Volume= Routed to Link E1 : EDA 1A 43,484 cf, Depth= 8.94" 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-Current Rainfall=9.18", 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 13 12 NOAA 24-hr D 100-Year-Current Rainfall=9.18" P2=3.47" Runoff Area=1.340 ac Runoff Volume=43,484 cf Runoff Depth=8.94" Flow Length=441' Tc=3.2 min CN=0/98 11 10 9 8 Flow (cfs) Runoff 11.78 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-Current Rainfall=9.18", 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 28 Summary for Subcatchment E1p: Existing Pervious Runoff = 0.03 cfs @ 12.20 hrs, Volume= Routed to Link E1 : EDA 1A 123 cf, Depth= 1.69" 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-Current Rainfall=9.18", 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 0.03 0.028 0.026 0.024 0.022 Flow (cfs) 0.02 0.018 0.016 0.014 0.012 0.01 Runoff 0.03 cfs NOAA 24-hr D 100-Year-Current Rainfall=9.18" P2=3.47" Runoff Area=0.020 ac Runoff Volume=123 cf Runoff Depth=1.69" Flow Length=526' Tc=8.6 min CN=39/0 0.008 0.006 0.004 0.002 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-Current Rainfall=9.18", 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 29 Summary for Subcatchment P1i: Proposed Impervious Runoff = 8.80 cfs @ 12.09 hrs, Volume= Routed to Link P1 : PDA 1A 32,451 cf, Depth= 8.94" 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-Current Rainfall=9.18", 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 100-Year-Current Rainfall=9.18" P2=3.47" Runoff Area=1.000 ac Runoff Volume=32,451 cf Runoff Depth=8.94" Flow Length=443' Tc=3.1 min CN=0/98 8 7 6 Flow (cfs) Runoff 8.80 cfs 9 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-Current Rainfall=9.18", 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 30 Summary for Subcatchment P1i(pp): Proposed Impervious Runoff = 2.07 cfs @ 12.04 hrs, Volume= Routed to Pond PP1 : Pervious Pavement 8,762 cf, Depth= 8.94" 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-Current Rainfall=9.18", 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 Runoff 2.07 cfs NOAA 24-hr D 100-Year-Current Rainfall=9.18" P2=3.47" Runoff Area=0.270 ac Runoff Volume=8,762 cf Runoff Depth=8.94" 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)