J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 NJ DEP 2-hr NJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 60 Summary for Subcatchment 4: PO-DA 4 Runoff = 0.75 cfs @ 1.18 hrs, Volume= 0.028 af, Depth= 0.37" Runoff by SCS TR-20 method, UH=SCS, Split Pervious/Imperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs NJ DEP 2-hr NJDEP Rainfall=1.25" •k k * Area (sf) CN Description Impervious, HSG D 4,334 98 Gravel road, HSG D 5,398 98 80 Grass cover, Good, HSG D 14,366 Meadow, non-qrazed, HSG D 15.808 78 39,906 84 Weighted Average 30,174 75.61% Pervious Area 79 24.39% Impervious Area 9,732 98 Length (feet) 100 Tc (min) 9.6 Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0500 0.17 Description Sheet Flow, Grass: Dense n= 0.240 P2= 3.42" 0.5 120 0.0830 Shallow Concentrated Flow, 4.32 Grassed Waterway Kv=15.0fps 145 0.7 0.0480 Shallow Concentrated Flow, 3.29 Grassed Waterway Kv= 15.0 fps 10.8 365 Total Subcatchment 4: PO-DA 4 Hydrograph in 0 -M oC 0.75-: 0.70.65• 0.6/ 0.55_ 0.5o. 0.45* | 0.4“■ 0.350.30.250.20.150.10.050- — -- - rr - — . r- r-■ 1 i 1 1 “ _ *1 —r ~ r _ i i “ i— i r- — -- -■ ~— J __ _ _l_ _ — -- _ _ — _ _ L _ — R l i Rur —i—i—i—i—i—i—i—i—i—r—i— 1 1 1 1 l 1 1 1 1 1 1 ~ -1 t - i i-r — t — i “ “i“ ~ r ■■ T ~ n — i i i i i i i i i i i NJ DEP 2-hr NJDEP r i i RainfalN1.25'r unoff Area=39,906 sf i.i i #i ii i toff Volume=0.028 af riii i 1 i l l r* i i _ i_ _ _ -- _ _ — _ , _ L _ J Lt 1i L . _ -- 1 1 234 Runoff bepth=d.37" 5 6 7 1 l 1 1 t I \ III 1 l I 1 1 1 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) i i i i^iow Lengin-^bo i i“ i i i i Tc=10;8 rriiri 1 1 1 ! i i lit ! 1 1 : 1 1 CN=79/98 1 t 1 1 1 i i : III ( 1 1 1 ! 1 1 I 1 1 1