J_2024 05 09_West Orange Stormwater Management Plan

Post Development West Orange B_03 01 12 Type III 24-hr 100 yr Rainfall=8.72" Prepared by TRC Engineers, Inc. HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Printed 3/14/2012 Page 46 Summary for Subcatchment 9A: PO-DA 9A Runoff = 5.05 cfs @ 12.38 hrs, Volume= 0.644 af, Depth= 6.98" 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 100 yr Rainfall=8.72" Area (sf) CN Description 650 98 Impervious, HSG D 1,367 98 Gravel road, HSG D 85 Yard stone, HSG D 46.220 48,237 86 Weighted Average 46,220 85 95.82% Pervious Area 2,017 98 4.18% Impervious Area ★ * * Tc (min) 21.7 Length (feet) 100 2.5 190 0.0060 1.25 4.3 130 0.0010 0.51 28.5 420 Total Slope Velocity (ft/ft) (ft/sec) 0.0070 0.08 Capacity (cfs) Description Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Shallow Concentrated Flow, Yard Stone Unpaved Kv= 16.1 fps Shallow Concentrated Flow, Yard Stone Unpaved Kv= 16.1 fps Subcatchment 9A: PO-DA 9A Hydrograph 5.05 cfs L _ i___ I__ I__ I____ 1__ I.__I__ I____ I___I__ I__ 1 _ :l . Urn W ii ii ii 1 o. 3 01 2 3 4 5 6 7 8 . I I . . I [ Type III 24-hr 100 yr RainfalN8.72" Runoff Area=48,237 sf » i i i it Runoff Volume=0.644 af Runoff Depth=6.98" Flow Length=420' i r Tc=28.5 mm ! CN=85/98 I* 1 1 ......................................11 11rrrrn I'p I'H pllll‘1 rrrt 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) (