J_2024 05 09_West Orange Stormwater Management Plan

Type III 24-hr 2 yr Rainfall=3.42" Post Development West Orange A_03 01 12 Prepared by TRC Engineers, Inc. Printed 3/14/2012 Page 3 HydroCAD® 9.10 s/n 06401 © 2009 HydroCAD Software Solutions LLC Summary for Subcatchment 1A: 1A 0.56 cfs @ 12.09 hrs, Volume= Runoff = Runoff by SCS TR-20 method, Type III 24-hr 2 yr Rainfall=3.42" UH=SCS, Split 0.041 af, Depth= 1.73" Pervious/lmperv., Time Span= 0.00-30.00 hrs, Area (sf) CN Description * Tc (min) 4.3 2,107 10,364 98 78 Impervious, HSG D Meadow, non-qrazed, HSG D 12,471 10,364 2,107 81 78 98 Weighted Average 83.10% Pervious Area 16.90% Impervious Area Length (feet) Slope Velocity Capacity Description (ft/ft) (ft/sec) (cfs) 70 0.1860 0.27 Sheet Flow, 3.11 Shallow Concentrated Flow, Grass: Dense n= 0.240 P2= 3.42' 0.4 70 0.0429 Grassed Waterway Kv=15.0fps 4.7 140 Total, Increased to minimum Tc = 6.0 min Subcatchment 1A: 1A Hydrograph 0.6 0.56 cfs 0.5 .-L-1_. 3.45 0.4«• 0.350.30.25- 0.2 0.150.1- .x . . u . i . -j . .i. _ i . i _ j . L - Jl - J L_1 0.05 rr-q 3 4 5 67 _ Type III 24-hr 2 yr Rainfall=3.42" Runoff Area=12,471 sf Runoff Volume=0.041 af Runoff Depth=1.73" Flow Length=140' r- - t Tc=6.0 min CN=78/98 0.55- 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Tims (hours) dt= 0.01 hrs