20070295 Ver 6_6.04 SCM B - Rip Rap Outlet Protection_20191220

DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET
Project
Holding Village - North Lake Date 12.16.2019
Project No.
RAP-19000 Designer DJG
Outlet ID
SCM B
Flow, Q10_yr
15.9 cfs
Slope, S
1.67 %
Pipe Diameter, Do
36 inches
Pipe Diameter, Do
3.0 feet
Number of pipes
1
Pipe separation
0 feet
Manning's n
0.013
FiLmre 8.06.b.1
25
20 one
U
15
zone 5
° 10
Zen? 4
0
0 1 2 3 4 5 6 7 8 9 10
Pipe diameter (ft)
Zone from graph above =
2
Outlet pipe diameter
36 in.
Length =
18.0 ft.
Outlet flowrate
15.9 cfs
Width =
9.0 ft.
Outlet velocity
9.3 ft/sec
Stone diameter =
6 in.
Material =
Class B
Thickness =
22 in.
Zone
Material
I Diameter I Thickness I
Length I
Width
1
2
3
Class A
Class B
Class 1
3
6
13
9
22
22
4 x D(o)
6 x D(o)
8 x D(o)
3 x D(o)
3 x D(o)
3 x D(o)
4
Class 1
13
22
8 x D(o)
3 x D(o)
5
Class 11
23
27
10 x D(o)
3 x D(o)
6
7
Class 11
23
27 10 x D(o)
Special study required
3 x D(o)
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
SCM - Rip Rap Outlet Protection Design12/16/2019