J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Pre-Development West Orange with ponds 2 Prepared by TRC Engineers, Inc. Printed 3/4/2012 Page 13 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 9B: EX-DA 9B Runoff = 1.68 cfs@ 12.43 hrs, Volume= Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.229 af, Depth= 2.62" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * * * 24,703 670 20,336 98 Impervious, HSG D 91 Gravel, HSG D 85 Yard stone, HSG D 45,709 21,006 24,703 92 Weighted Average 85 45.96% Pervious Area 98 54.04% Impervious Area Tc (min) Length (feet) Slope Velocity Capacity (ft/ft) (ft/sec) 30.0 150 0.0070 0.08 Sheet Flow, Yard Stone 1.0 160 0.0190 2.80 Shallow Concentrated Flow, Description (cfs) n= 0.250 P2= 3.42" Paved Kv= 20.3 fps 31.0 310 Total Subcatchment 9B: EX-DA 9B Hydrograph 68 cfs Type III 24-hr 2 yr i Rainfallf3.42V Runoff Area=45,709 sf Runoff; Volume=0.229 af : Runoff Depfh=2.6i2* i Flow Length=310’ | i Tc=3i;o min CN=85/98 I 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Time (hours) ' M u p dt= 0.01 hrs