J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 NJ DEP 2-hrNJDEP Rainfall=1.25" Prepared by TRC Engineers, Inc. HvdroCAD® 9.10 s/n 06401 © 2009 HvdroCAD Software Solutions LLC Printed 3/14/2012 Page 61 Summary for Subcatchment 5A: PO-DA 5A Runoff = 1.19 cfs@ 1.12 hrs, Volume= 0.036 af, Depth= 0.59" 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" * * Area (sf) CN Description 15,734 98 Impervious, HSG D 8,318 80 Grass cover, Good, HSG D 78 Meadow, non-grazed, HSG D 7.713 88 Weighted Average 31,765 79 50.47% Pervious Area 16,031 15,734 98 49.53% Impervious Area Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0730 2.59 Description Tc (min) 1.0 Length (feet) 150 0.5 135 0.0590 4.93 Shallow Concentrated Flow, 0.8 180 0.0330 3.69 Shallow Concentrated Flow, 0.2 34 0.0190 2.80 Sheet Flow, Smooth surfaces n= 0.011 P2=3.42" Paved Kv= 20.3 fps Paved Kv= 20.3 fps Shallow Concentrated Flow, Paved Kv= 20.3 fps 499 Total, Increased to minimum Tc = 6.0 min 2.5 Subcatchment 5A: PO-DA 5A Hydrograph d .19 cfs NJ DEP 2-hr NJDEP / Rainfall=1.25" Runoff Area=31,765 sf Runoff Volume=0.036 af Runoff Depth=0.59" / z Flow Length=499' £ Tc=6.0 min %% CN=79/98 i . I I I I .1 i' 0 1 2 3 4 5S7 3 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tims (hours)