SW5180301_Outlet Pipe Protection_20180424

Project Date 11/10/2017
Project No. Designer
Outlet ID
Outlet flowrate 12.15 cfs
Pipe diameter 15 inches
Number of pipes 1
Pipe separation feet
Outlet pipe slope 1.67 percent
Zone from graph above =2
Outlet pipe diameter 15 in.Length =7.5 ft.
Outlet flowrate 12.2 cfs Width =3.75 ft.
Outlet velocity 9.9 ft/sec Stone diameter =6 in.
Material =Class B Thickness =22 in.
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o) 3 x D(o)
2 Class B 6 22 6 x D(o) 3 x D(o)
3 Class I 13 22 8 x D(o) 3 x D(o)
4 Class I 13 22 8 x D(o) 3 x D(o)
5 Class II 23 27 10 x D(o) 3 x D(o)
6 Class II 23 27 10 x D(o) 3 x D(o)
7
1. Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
2. Outlet velocity based on full-flow velocity
Special study required
DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET
Crawford Townes
17022 TCM
Wetland
9.9 ft/sec
0
5
10
15
20
25
0246810Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Crawford Townes_RipRap Outlet Pipe Protection.xlsx
4/24/2018