NJ DEP 2-hr NJDEP WQ Rainfall=1.25" Printed 12/19/2025 tions LLC Page 33
Analysis - Proposed Conditions NJ DEP 2-hr Prepared by Civil Core Consulting HydroCAD® 10.20-8a s/n 13637 © 2025 HydroCAD Software Solutions LLC
Summary for Pond 14P: PERVIOUS PAVEMENT 3B
Inflow Area =8,712 sf,100.00% Impervious, Inflow Depth = 1.03" for NJDEP WQ event
Inflow =0.53 cfs @ 1.10 hrs, Volume= 751 cf
Outflow =0.09 cfs @ 1.45 hrs, Volume= 748 cf, Atten= 83%, Lag= 20.5 min
Primary =0.09 cfs @ 1.45 hrs, Volume= 748 cf
Routing by Dyn-Stor-Ind method, Time Span= 0.00-72.00 hrs, dt= 0.01 hrs
Peak Elev= 94.22' @ 1.45 hrs Surf.Area= 2,963 sf Storage= 503 cf
Plug-Flow detention time= 116.9 min calculated for 748 cf (100% of inflow) Center-of-Mass det. time= 117.2 min (188.5 - 71.3)
VolumeInvertAvail.StorageStorage Description
#193.80'593 cfStone Storage Bed (Prismatic)Listed below (Recalc) 1,482 cf Overall × 40.0% Voids
#294.30'222 cfSurface and Base Course (Prismatic)Listed below (Recalc) 1,482 cf Overall × 15.0% Voids
#394.80'1,482 cfSurface (Prismatic)Listed below (Recalc)
2,296 cfTotal Available Storage
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
93.802,96300
94.302,9631,4821,482
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
94.302,96300
94.802,9631,4821,482
Elevation (feet)Surf.Area (sq-ft)Inc.Store (cubic-feet)Cum.Store (cubic-feet)
94.802,96300
95.302,9631,4821,482
DeviceRoutingInvertOutlet Devices
#1Device 393.80'2.5" Vert. Orifice C = 0.600
#2Device 394.80'48.0" x 48.0" Horiz. Grate C = 0.600
#3Primary92.00'12.0" Round Culvert L = 52.0' RCP, groove end projecting, Ke = 0.200Inlet / Outlet Invert= $ 92.00'/90.75' $ S = 0.0240'/ Cc = 0.900n= 0.011, Flow Area= 0.79 sf
Primary OutFlow Max=0.09 cfs @ 1.45 hrs HW=94.22' (Free Discharge) 3=Culvert (Passes 0.09 cfs of 6.21 cfs potential flow) 1=Orifice (Orifice Controls 0.09 cfs @ 2.72 fps) 2=Grate (Controls 0.00 cfs)