21 Stormwater Mgmt Report_082025

NJA230139 - REV 0 Printed 8/6/2025 Page 2 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# 1 2 3 4 Event Name Storm Type Curve Mode Duration (hours) B/B Depth (inches) 2-Year-Future 10-Year-Future 100-Year-Future 25-Year-Future NOAA 24-hr NOAA 24-hr NOAA 24-hr NOAA 24-hr D D D D Default Default Default Default 24.00 24.00 24.00 24.00 1 1 1 1 4.09 6.37 11.52 8.02 AMC 2 2 2 2 P2 (inches) 4.09 4.09 4.09 3.47

NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Area Listing (all nodes) Area (sq-ft) CN Description (subcatchment-numbers) 4,792 113,692 118,483 39 98 96 >75% Grass cover, Good, HSG A (E1p, P1p) Paved parking, HSG A (E1i, P1i, P1i(pp)) TOTAL AREA Printed 8/6/2025 Page 3

NJA230139 - REV 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Soil Listing (all nodes) Area (sq-ft) Soil Group Subcatchment Numbers 118,483 0 0 0 0 118,483 HSG A HSG B HSG C HSG D Other E1i, E1p, P1i, P1i(pp), P1p TOTAL AREA Printed 8/6/2025 Page 4

NJA230139 - REV 0 Printed 8/6/2025 Page 5 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 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 4,792 113,692 118,483 0 0 0 0 0 0 0 0 113,692 118,483 >75% Grass cover, Good Paved parking TOTAL AREA Sub Num

NOAA 24-hr D 2-Year-Future Rainfall=4.09", 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 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=1.340 ac 100.00% Impervious Runoff Depth=3.85" Flow Length=441' Tc=3.1 min CN=0/98 Runoff=5.22 cfs 18,751 cf Subcatchment E1i: Existing Impervious Subcatchment E1p: Existing Pervious Runoff Area=0.020 ac 0.00% Impervious Runoff Depth=0.06" Flow Length=526' Tc=8.2 min CN=39/0 Runoff=0.00 cfs 4 cf Subcatchment P1i: Proposed Impervious Runoff Area=1.000 ac 100.00% Impervious Runoff Depth=3.85" Flow Length=443' Tc=3.0 min CN=0/98 Runoff=3.90 cfs 13,993 cf Runoff Area=0.270 ac 100.00% Impervious Runoff Depth=3.85" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 Runoff=0.92 cfs 3,778 cf Subcatchment P1i(pp): Proposed Subcatchment P1p: Proposed Pervious Pond PP1: Pervious Pavement Runoff Area=0.090 ac 0.00% Impervious Runoff Depth=0.06" Flow Length=528' Tc=8.1 min CN=39/0 Runoff=0.00 cfs 18 cf Peak Elev=367.09' Storage=1,510 cf Inflow=0.92 cfs 3,778 cf Outflow=0.70 cfs 2,754 cf Link E1: EDA 1A Inflow=5.22 cfs 18,755 cf Primary=5.22 cfs 18,755 cf Link P1: PDA 1A Inflow=4.57 cfs 16,765 cf Primary=4.57 cfs 16,765 cf Total Runoff Area = 118,483 sf Runoff Volume = 36,545 cf Average Runoff Depth = 3.70" 4.04% Pervious = 4,792 sf 95.96% Impervious = 113,692 sf

NOAA 24-hr D 2-Year-Future Rainfall=4.09", 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 7 Summary for Subcatchment E1i: Existing Impervious Runoff = 5.22 cfs @ 12.09 hrs, Volume= Routed to Link E1 : EDA 1A 18,751 cf, Depth= 3.85" 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-Future Rainfall=4.09", 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 Runoff 5.22 cfs NOAA 24-hr D 2-Year-Future Rainfall=4.09" P2=4.09" Runoff Area=1.340 ac Runoff Volume=18,751 cf Runoff Depth=3.85" Flow Length=441' 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-Future Rainfall=4.09", 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 8 Summary for Subcatchment E1p: Existing Pervious Runoff = 0.00 cfs @ 16.78 hrs, Volume= Routed to Link E1 : EDA 1A 4 cf, Depth= 0.06" 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-Future Rainfall=4.09", 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 0.000 0.000 0.000 0.000 Flow (cfs) 0 0 0 0 0 0 Runoff 0.00 cfs NOAA 24-hr D 2-Year-Future Rainfall=4.09" P2=4.09" Runoff Area=0.020 ac Runoff Volume=4 cf Runoff Depth=0.06" Flow Length=526' Tc=8.2 min CN=39/0 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-Future Rainfall=4.09", 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 9 Summary for Subcatchment P1i: Proposed Impervious Runoff = 3.90 cfs @ 12.09 hrs, Volume= Routed to Link P1 : PDA 1A 13,993 cf, Depth= 3.85" 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-Future Rainfall=4.09", 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 NOAA 24-hr D 2-Year-Future Rainfall=4.09" P2=4.09" Runoff Area=1.000 ac Runoff Volume=13,993 cf Runoff Depth=3.85" Flow Length=443' Tc=3.0 min CN=0/98 3 Flow (cfs) Runoff 3.90 cfs 4 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 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 10 Summary for Subcatchment P1i(pp): Proposed Impervious Runoff = 0.92 cfs @ 12.04 hrs, Volume= Routed to Pond PP1 : Pervious Pavement 3,778 cf, Depth= 3.85" 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-Future Rainfall=4.09", 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 1 Runoff 0.92 cfs Flow (cfs) NOAA 24-hr D 2-Year-Future Rainfall=4.09" P2=4.09" Runoff Area=0.270 ac Runoff Volume=3,778 cf Runoff Depth=3.85" Flow Length=30' Slope=0.0150 '/' Tc=0.5 min CN=0/98 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 0 Prepared by Bohler HydroCAD® 10.20-5c s/n 03478 © 2023 HydroCAD Software Solutions LLC Printed 8/6/2025 Page 11 Summary for Subcatchment P1p: Proposed Pervious Runoff = 0.00 cfs @ 16.78 hrs, Volume= Routed to Link P1 : PDA 1A 18 cf, Depth= 0.06" 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-Future Rainfall=4.09", 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 Hydrograph 0.001 0.001 0.001 0.000 Flow (cfs) 0.000 0.000 0.000 0.000 0.000 Runoff 0.00 cfs NOAA 24-hr D 2-Year-Future Rainfall=4.09" P2=4.09" Runoff Area=0.090 ac Runoff Volume=18 cf Runoff Depth=0.06" Flow Length=528' Tc=8.1 min CN=39/0 0.000 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)