J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange C_03 01 12 Prepared by TRC Engineers, Inc. Printed 3/14/2012 Page 7 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 8: PO-DA 8 Runoff = 0.62 cfs @ 12.43 hrs, Volume= 0.086 af, Depth= 2.79" 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 98 Impervious, HSG D 10,980 85 Yard stone, HSG D 5,243 94 Weighted Average 16,223 85 32.32% Pervious Area 5,243 98 67.68% Impervious Area 10,980 Tc (min) 30.5 Length (feet) 100 1.2 80 0.0030 31.7 180 Total Slope Velocity Capacity (ft/ft) (ft/sec) (cfs) 0.0030 0.05 1.11 Description Sheet Flow, Yard Stone n= 0.250 P2= 3.42" Shallow Concentrated Flow, Paved Kv= 20.3 fps Subcatchment 8: PO-DA 8 Hydrograph 0.62 0 65 0.6 Type III 24-hr 2 yr 0 55 Rainfa!l=342' 0.5 Runoff Area=16,223 sf 0.45 Runoff Volume=0.086 af 04 Runoff Depth=2.79" 0.35 0.3 Flow Length=180’ 0 25 Slope=0.0030 V 02 Tc=31.7 min -4- 0.15 ; — 0.1 0.05 rjrr 0 1 2 34 56 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) i i CN=85/98