09 Stormwater Mgmt Report 122025

NOAA 24-hr D 25-Year-Future Rainfall=8.02", P2=3.47" 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 42 Summary for Pond PP1: Pervious Pavement Inflow Area = 11,761 sf,100.00% Impervious, Inflow Depth = 7.78" for 25-Year-Future event Inflow = 1.81 cfs @ 12.04 hrs, Volume= 7,625 cf Outflow = 1.49 cfs @ 12.12 hrs, Volume= 6,601 cf, Atten= 18%, Lag= 4.7 min Primary = 1.49 cfs @ 12.12 hrs, Volume= 6,601 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= 367.19' @ 12.12 hrs Surf.Area= 8,538 sf Storage= 1,832 cf Plug-Flow detention time= 143.6 min calculated for 6,592 cf (86% of inflow) Center-of-Mass det. time= 78.1 min ( 815.0 - 736.9 ) 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=1.45 cfs @ 12.12 hrs HW=367.18' TW=0.00' (Dynamic Tailwater) 1=RCP_Round 15" (Passes 1.45 cfs of 5.48 cfs potential flow) 2=Sharp-Crested Rectangular Weir (Weir Controls 1.45 cfs @ 1.58 fps)

NOAA 24-hr D 25-Year-Future Rainfall=8.02", P2=3.47" 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 43 Pond PP1: Pervious Pavement Hydrograph 2 1.49 cfs Flow (cfs) Inflow Primary 1.81 cfs Inflow Area=11,761 sf Peak Elev=367.19' Storage=1,832 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)

NOAA 24-hr D 25-Year-Future Rainfall=8.02", P2=3.47" 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 44 Summary for Link E1: EDA 1A Inflow Area = Inflow = Primary = 84,942 sf, 98.97% Impervious, Inflow Depth = 7.71" for 25-Year-Future event 14.83 cfs @ 12.09 hrs, Volume= 54,592 cf 14.83 cfs @ 12.09 hrs, Volume= 54,592 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 16 15 14.83 cfs 14.83 cfs Inflow Primary Inflow Area=84,942 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)

NOAA 24-hr D 25-Year-Future Rainfall=8.02", P2=3.47" 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 45 Summary for Link P1: PDA 1A Inflow Area = Inflow = Primary = 85,378 sf, 95.41% Impervious, Inflow Depth = 7.33" for 25-Year-Future event 13.79 cfs @ 12.09 hrs, Volume= 52,169 cf 13.79 cfs @ 12.09 hrs, Volume= 52,169 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 14 13.79 cfs 13.79 cfs Inflow Primary Inflow Area=85,378 sf 13 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)

NJA230139 - REV 2 NOAA 24-hr D 2-Year-Future Rainfall=4.09", P2=4.09" Printed 12/11/2025 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Primary Comparison 8 7.52 cfs 6.91 cfs 7 6 Primary (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) Link E1 Link P1

NJA230139 - REV 2 NOAA 24-hr D 10-Year-Future Rainfall=6.37", P2=4.09" Printed 12/11/2025 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Primary Comparison 13 11.76 cfs 10.89 cfs 12 11 10 9 Primary (cfs) 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) Link E1 Link P1

NJA230139 - REV 2 NOAA 24-hr D 100-Year-Future Rainfall=11.52", P2=4.09" Printed 12/11/2025 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Primary Comparison 23 21.36 cfs 20.04 cfs 22 21 20 19 18 17 16 Primary (cfs) 15 14 13 12 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) Link E1 Link P1

C. WATER QUALITY ♦ Water Quality Storm Hydrograph

E1i E1p P1i(pp) P1i P1p Existing Impervious Existing Pervious Proposed Impervious Proposed Impervious Proposed Pervious PP1 Pervious Pavement Subcat E1 P1 EDA 1A PDA 1A Reach Pond Link Routing Diagram for NJA230139 - REV 2 Prepared by Bohler Engineering, PC, Printed 12/11/2025 HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC

NJA230139 - REV 2 Printed 12/11/2025 Page 2 Prepared by Bohler Engineering, PC HydroCAD® 10.20-7a s/n 03478 © 2025 HydroCAD Software Solutions LLC Rainfall Events Listing (selected events) Event# 1 Event Name Storm Type WQ NJ DEP 2-hr Curve Mode Duration (hours) Default 2.00 B/B 1 Depth (inches) 1.25 AMC 2 P2 (inches) 4.09