NJ DEP 2-hr NJDEP WQ Rainfall=1.25" Printed 12/19/2025 ions LLC Page 39
Analysis - Proposed Conditions NJ DE Prepared by Civil Core Consulting HydroCAD® 10.20-8a s/n 13637 © 2025 HydroCAD Software Solutions LLC
Summary for Pond 36P: BIORETENTION BASIN 1A
Inflow Area = 70,567 sf, 24.69% Impervious, Inflow Depth = 0.26" for NJDEP WQ event
Inflow = 1.19 cfs @ 1.09 hrs, Volume= 1,502 cf
Outflow = 0.00 cfs @ 2.07 hrs, Volume= 1 cf, Atten= 100%, Lag= 58.9 min
Primary = 0.00 cfs @ 2.07 hrs, Volume= 1 cf
Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Peak Elev= 91.00' @ 2.27 hrs Surf.Area= 1,500 sf Storage= 1,502 cf
Plug-Flow detention time= 1,912.8 min calculated for 1 cf (0% of inflow)
Center-of-Mass det. time= 1,866.1 min ( 1,934.7 - 68.6 )
Volume Invert Avail.Storage Storage Description
#1 90.00' 8,250 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area (feet) (sq-ft) Inc.Store (cubic-feet) Cum.Store (cubic-feet)
90.00 1,500 0 0
95.50 1,500 8,250 8,250
Device Routing Invert Outlet Devices
#1 Device 3 91.00' 2.5" Vert. Orifice C= 0.600 Limited to weir flow at low heads
#2 Device 3 95.00' 48.0" x 48.0" Horiz. Grate C= 0.600
#3 Primary 87.48' 12.0" Round Culvert L= 27.0' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 87.48' / 87.00' S= 0.0178 ' / Cc= 0.900
n= 0.012 Concrete pipe, finished, Flow Area= 0.79 sf
Primary OutFlow Max=0.00 cfs @ 2.07 hrs HW=91.00' (Free Discharge)
3=Culvert (Passes 0.00 cfs of 7.87 cfs potential flow)
1=Orifice (Orifice Controls 0.00 cfs @ 0.03 fps)
2=Grate ( Controls 0.00 cfs)