J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange B_03 01 12 Prepared by TRC Engineers, Inc. Printed 3/14/2012 Page 8 HvdroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 9A: PO-DA 9A Runoff = 1.49 cfs@ 12.39 hrs, Volume= 0.184 af, Depth= 2.00" 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 2 yr Rainfall=3.42" * * * Area (sf) CN Description 650 98 Impervious, HSG D 1,367 98 Gravel road, HSG D 85 Yard stone, HSG D 46,220 86 Weighted Average 48,237 85 95.82% Pervious Area 46,220 2,017 98 4.18% Impervious Area Tc (min) 21.7 Length (feet) 100 Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0070 0.08 2.5 Description Sheet Flow, Yard Stone 190 0.0060 1.25 Shallow Concentrated Flow, Yard Stone 4.3 130 0.0010 0.51 Shallow Concentrated Flow, Yard Stone 28.5 420 Total n= 0.250 P2= 3.42" Unpaved Kv= 16.1 fps Unpaved Kv= 16.1 fps Subcatchment 9A: PO-DA 9A Hydrograph :-----r rm . _ L _ . — cfs L_L„J_. ; Type III 24-hr 2 yr : Rainfall=3.42" Runoff Area=48,237 sf Runoff Volume=0.184 af Runoff Depth=2.00" Flow Length=420' j j j | j : Tc=28.5 min ! CN=85/98 rrrrrr 0 1 2 34 56 78 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours)