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 53 Summary for Subcatchment 1C: 1C Runoff = 0.33 cfs @ 1.12 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall*! .25“ UH=SCS, Split 0.010 af, Depth= 0.53" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * 4,402 5.534 98 Impervious, HSG D 78 Meadow, non-qrazed. 9,936 5,534 4,402 87 Weighted Average 78 55.70% Pervious Area 98 44.30% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity (ft/ft) (ft/sec) 0.6 50 0.0300 1.46 0.4 92 0.0666 3.87 HSG D Description (cfs) Sheet Flow, Smooth surfaces n= 0.011 P2= 3.42" Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps 1.0 142 Total, Increased to minimum Tc = 6.0 min Subcatchment 1C: 1C Hydrograph .33 cfs 0.32 0.3 ' ,L-1-J_ __L-L U-.tr 0.23 __L'_2.. 0.26 0 24 0.22 ---- 1 —» 0.2 5 0.18 u. 0.16 .-. 3.14 0.12 0.1 9 33 9.06 3 04 0.02 rTi NJ DEP 2-hr NJDEP Rainfall=1.25" Runoff Area=9,936 sf Runoff Volume=0.010 af Runoff Depth=0.53" Flow Length=142' Tc=6.0 min CN=78/98 - 1 ■w ■ -U-L I 56 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) dt= 0.01 hrs