J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange C_03 01 12 Prepared by TRC Engineers, Inc. Printed 3/14/2012 HvdroCAD® 9.10 s/n 06401 ©2009 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 9B: PO-DA 9B 0.188 af, Depth= 2.29" 1.66 cfs @ 12.30 hrs, Volume= Runoff = Runoff by SCS TR-20 method, UH=SCS, Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Type III 24-hr 2 yr Rainfall=3.42" Area (sf) CN Description 5,504 98 Impervious, HSG D 98 Gravel road, HSG D 6,361 85 Yard stone, HSG D 30,963 42,828 89 Weighted Average 30,963 72.30% Pervious Area 85 11,865 27.70% Impervious Area 98 * * * Tc (min) 19.6 Length (feet) 100 1.9 150 0.0066 21.5 250 Total Slope Velocity Capacity (cfs) (ft/ft) (ft/sec) 0.08 0.0090 Description Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Shallow Concentrated Flow, Yard Stone 1.31 Unpaved Kv= 16.1 fps Subcatchment 9B: PO-DA 9B 1.C o> Hydrograph i 1 1 i Type III 24-hr 2 yr I i Rainfall=3.42" lunoff Area=42,828 sf Sunoff; Volume=0.188; af •a u Runoff Depth=2.29" 5 2 Flow Length^SO' Tc=21L5 min ; CN=85/98 0- <$$$$$%* |l ll l| i l l i |l n || n u || n U n n |iu i| n u |l i i i | ' i m |l u i | .................................................. 11 0 1 2 34 56 78 ' . I n n I ' nifu n |i 1 1 1 pi n .............................. ............................ m I p m 1 111 11 11 111 11 11 | l 1 1 1| 1 11 11 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)