J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange A_03 01 12 Prepared by TRC Engineers, Inc. NJ DEP 2-hr NJDEP Rainfall= 1.25" Printed 3/14/2012 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Page 55 Summary for Subcatchment 3B: 3B Runoff = 0.49 cfs @ Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" 1.11 hrs, Volume= UH=SCS, Split 0.015 af, Depth= 0.72" Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Area (sf) CN Description * 5,785 1,111 3.792 98 98 78 Impervious, HSG D Gravel Road, HSG D Meadow, non-qrazed, HSG D 10,688 3,792 6,896 91 78 98 Weighted Average 35.48% Pervious Area 64.52% Impervious Area * Tc (min) Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 1.3 100 0.0150 1.27 0.8 150 0.0400 3.00 2.1 250 Total, Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Increased to minimum Tc = 6.0 min Subcatchment 3B: 3B Hydrograph / 49 cfs 0.45--4 0.4- 0.35 ■S 0.3- NJ DEP 2-hr NJDEP Rainfall=1.25" Runoff Area=10,688 sf Runoff Volume=0.015 af Runoff Depth=0.72" r — Flow Length=250' Tc=6.0 min CN=78/98 "i— t “ i —i— r - T - t —»— i— 2 0.25- 0.2- 0.15 . l i •* . i _ 01■ 0.05- 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tima (hours) j ________i __________ l _ i. . j _