J_2024 05 09_West Orange Stormwater Management Plan

Pre-Development West Orange with ponds 2 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/4/2012 Page 54 Summary for Subcatchment 9A: EX-DA 9A Runoff 2.20 cfs@ 12.42 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 100 yr Rainfall=8.72" UH=SCS, Split 0.294 af, Depth= 7.01" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description 1,344 98 85 21,924 20,580 1,344 86 Weighted Average 85 93.87% Pervious Area 98 6.13% Impervious Area Length (feet) Tc (min) 31.4 Paved road, HSG D Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 120 0.0040 Sheet Flow, Yard stone 0.06 n= 0.250 P2= 3.42" Subcatchment 9A: EX-DA 9A Hydrograph 2.20 Cfs Type l|l 24-hr lOOlyr i Rainfall=8.72" % E i i i il i 1i wk 1 i i i 0 1 2 34 5 6 l i i i i i i i i i i i i i i i i lunoff Area=21,924 sf i off; Volume=0.;294; af ftunoff bepthFtdr;' | Flow Length=120' j Slope=0.0040 T i t i i i i i i :=3l4;min 1 iii i i i i i i i «,i i i ;CN=85/98 i i i i i i i i i i i ! ' TfrrTTpTrTfmift fiifnii|1 u ifnu |‘n n fi n ifnn p ht|*h rifrinfn 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