J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange C_03 01 12 Prepared byTRC Engineers, Inc. NJ DEP 2-hrNJDEP Rainfall=1.25" Printed 3/14/2012 Page 69 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 7: PO-DA 7 0.034 af, Depth= 0.19" 1.04 cfs@ 1.16 hrs, Volume= Runoff = Pervious/lmperv., Time Span= 0.00-30.00 hrs, dt= 0.01 hrs Runoff by SCS TR-20 method, UH=SCS, Split NJ DEP 2-hr NJDEP Rainfall=1.25" Area (sf) CN Description * * ★ 1,868 14,410 72,265 5,406 98 Impervious, HSG D 85 Yard stone, HSG D 80 Grass , Good, HSG 73 Brush, Good, HSG D 93,949 92,081 1,868 81 Weighted Average 98.01% Pervious Area 80 1.99% Impervious Area 98 Tc (min) Length (feet) 4.5 70 Slope Velocity Capacity (ft/ft) (ft/sec) D Description (cfs) Sheet Flow, 0.1600 0.26 Grass: Dense n= 0.240 P2= 3.42" 70 0.8 1.46 0.0857 Shallow Concentrated Flow, Woodland Kv= 5.0 fps 2.4 310 0.0200 2.12 7.7 450 Total Shallow Concentrated Flow, Grassed Waterway Kv= 15.0 fps Subcatchment 7: PO-DA 7 Hydrograph 04 cfs L_ V, 7 / 0 12 3 4 5 6 8 NJ DEP 2-hr NJDEP Rainfall=1.25' Runoff Area=93,949 sf Runoff Volume=0.034 af Runoff Depth=0.19" Flow Length=450' Tc=7.7 min CN=80/98 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)