20150615 Ver 1_Wetpond Exit Velocity_20160708

21 BOH LER
E N G I N E E R I N G
Rip Rap Dissapater Flow
Estimate 10 -yr Peak Runoff:
Qio Total, Qdesign 9.50 CfS
Channel Information:
Channel Bottom Width, b 4.5 ft/ft
Side Slope (x:1) 0.0
Channel Slope, S 0.010 ft/ft
Flow Depth, d 1.25 ft
Selected Channel Lining:
Selected Channel Linin 9 -inch D50 Class B
Maximum Permissible Velocity {Vmax) (fps)6
Permissible Shear Stress {tp} (psf) 3.00
Calculations:
e
0.0
ft
Side Slope Length, m
1.3
ft
Top Width, T
4.5
ft
Channel Area, A
5.64
sq ft
Wetted Perimeter, PW
7.00
ft
Hydraulic Radius, Rh
0.81
ft
Mannings "n"
0.074
Calculated Flow Rate, Qcaio
9.83
cfs
Calculated Velocity, Vcaic
1.74
fps
OK
Calculated Shear Stress, tomo
0.78
psf
Q calc >_ Q design? yes
V calc < V max? yes
t calc <_ t p? yes