J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 NJ DEP 2-hr NJDEP Rainfall=1.25" Prepared byTRC Engineers, Inc. Printed 3/14/2012 HydroCAD® 9.10 s/n 06401 © 2009 HvdroCAD Software Solutions LLC Page 71 Summary for Subcatchment 9B: PO-DA 9B Runoff = 0.85 cfs@ 1.31 hrs, Volume= Runoff by SCS TR-20 method, NJ DEP 2-hr NJDEP Rainfall=1.25" UH=SCS, 0.041 af, Depth= 0.51" Split Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description ★ * 5,504 6,361 30.963 98 Impervious, HSG D 98 Gravel road, HSG D 85 Yard stone, HSG D 42,828 30,963 11,865 89 Weighted Average 85 72.30% Pervious Area 98 27.70% Impervious Area * Tc (min) Length (feet) 19.6 100 0.0090 0.08 1.9 150 0.0066 1.31 21.5 250 Total Slope Velocity Capacity (ft/ft) (ft/sec) Description (cfs) Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Shallow Concentrated Flow, Yard Stone Unpaved Kv= 16.1 fps Subcatchment 9B: PO-DA 9B Hydrograph /I_'■ - i-„- — , ---- | -------4 - 4 - ------------- ---- t~ - + - 4 --------- ' ■ 0.85 cfs 0.85 0.8 0.750.7- -- L _ 4--- g £ 0.65- o.s 4 ------- 1 ___ ------L _ 4 _ 0.5505 0.45- 0.40.35 0.3 _L_4 NJ DEP 2-hr NJDEP Rainfall-1.25" Runoff Area-42,828 sf Runoff Volume=0,041af Runoff Depth=0.51" Flow Length=250' i Tc-21.5 min CN=85/98 . I ------ I ____ 4 . - I__l _ I 1 0.250.20.15 0.10.05 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 28 27 28 29 30 Tima (hours) dt= 0.01 hrs