2026 05 Storm Water Management Report rcd 5 6 2026

2026-04 Proposed & Existing Conditions NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" 2026-04 Proposed & Existing Conditions NJ DEP 2-hr WQ Rainfall=1.25", P2=4.09" Prepared by Dynamic Engineering Printed 5/5/2026 Prepared by Dynamic Engineering Printed 5/5/2026 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 7 HydroCAD® 10.20-7a s/n 08640 © 2025 HydroCAD Software Solutions LLC Page 8 Summary for Pond 1P: UG BASIN Pond 1P: UG BASIN Hydrograph Inflow Area = 0.142 ac,100.00% Impervious, Inflow Depth = 1.03" for WQ event Inflow = 0.44 cfs @ 1.08 hrs, Volume= 0.012 af 0.44 cfs Inflow Primary Outflow = 0.22 cfs @ 1.10 hrs, Volume= 0.012 af, Atten= 49%, Lag= 1.2 min 0.48 0.46 Primary = 0.22 cfs @ 1.10 hrs, Volume= 0.012 af 0.44 Inflow Area=0.142 ac Routed to Link 4L : POI #1 0.42

0.42 0.4 0.38 Peak Elev=618.77' Routing by Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.001 hrs Peak Elev= 618.77' @ 1.10 hrs Surf.Area= 0.006 ac Storage= 0.004 af 0.36 0.34 Storage=0.004 af 0.32 0.3 Plug-Flow detention time= 8.6 min calculated for 0.012 af (100% of inflow) Flow (cfs) 0.28 Center-of-Mass det. time= 8.6 min ( 74.3 - 65.6 ) 0.260.22 cfs 0.24 0.22 Volume Invert Avail.Storage Storage Description 0.2 0.18 #1 617.75'

0.2 0.18 #1 617.75' 0.020 af 48.0" Round Pipe Storage 0.16 L= 70.0' 0.14 0.12 0.1 Device Routing Invert Outlet Devices 0.08 #1 Primary 617.75' 15.0" Round RCP_Round 15" 0.06 0.04 L= 15.0' RCP, rounded edge headwall, Ke= 0.100 0.02 Inlet / Outlet Invert= 617.75' / 617.55' S= 0.0133 '/' Cc= 0.900 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 n= 0.012 Concrete pipe, finished, Flow Area= 1.23 sf Time (hours) #2 Device 1 617.75' 3.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #3 Device 1 620.25' 6.0" Vert. Orifice C= 0.600 Limited to weir flow at low heads #4 Device 1 621.45' 4.0' long Sharp-Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max=0.22 cfs @ 1.10 hrs HW=618.77' (Free Discharge) 1=RCP_Round 15" (Passes 0.22 cfs of 3.65 cfs potential flow) 2=Orifice (Orifice Controls 0.22 cfs @ 4.55 fps) 3=Orifice ( Controls 0.00 cfs) 4=Sharp-Crested Rectangular Weir ( Controls 0.00 cfs)