J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 65 Summary for Subcatchment 9A: PO-DA 9A Runoff = 0.53 cfs @ 1.43 hrs, Volume= 0.031 af, Depth= 0.33" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" * * * Area (sf) CN Description 650 98 Impervious, HSG D 1,367 98 Gravel road, HSG D 46,220 85 Yard stone, HSG D 48,237 86 Weighted Average 46,220 85 95.82% Pervious Area 2,017 98 4.18% Impervious Area Tc (min) 21.7 Length (feet) 100 2.5 Description Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0070 0.08 Sheet Flow, Yard Stone 190 0.0060 1.25 Shallow Concentrated Flow, Yard Stone 4.3 130 0.0010 0.51 Shallow Concentrated Flow, Yard Stone 28.5 420 Total n= 0.250 P2= 3.42" Unpaved Kv= 16.1 fps Un paved Kv= 16.1 fps Subcatchment 9A: PO-DA 9A Hydrograph — D.53 cfs | —i uta---- 1 0.5 0.5 NJ DEP 2-hr NJDEP 0.45- RainfalNt.25" 0.4- Runoff Area=48,237 sf 0.35- Runoff Volume=0.031 af — Runoff Depth=0.33" 0.3 Flow Length=420' “■ 0 25_ Tc=28.5 min 0.2- CN=85/98 0.15 0.1 0.05 01 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tima (hours)