20181535 Ver 1_P222 Airfield Security Upgrades Drawings_20181108

Outlet Pipe
Diameter
(D)
(Inches)
Maximum
Pipe
Discharge
(Q, cfs)

Velocity
(V, fps)
Minimum
Apron
Length
(La)
(Ft.)
Minimum
Apron
Width (W)
(Ft.)
Minimum
Apron
Thickness
(d)
(Ft.)
Median
Stone Size
d50
Ft.)
Maximum
Tailwater
Depth
(ft)
NCDOT
Rip Rap

15 6.1 5 8 9.25 1 0.5 1.1 Class A
18 8.8 5 9 10.5 1 0.5 1.4 Class A
24 15.7 5 13 15 1 0.5 1.7 Class A
30 24.5 5 16 18.5 1 0.5 2.1 Class A

UNDEFINED DISCHARGE CHANNEL

Outlet Pipe
Diameter
(d
(Inches)
Maximum
Pipe
Discharge
(Q, cfs)

Velocity
(V, fps)
Minimum
Apron
Length
(La)
(Ft.)
Minimum
Apron
Width (W)
(Ft.)
Minimum
Apron
Thickness
(d)
(Ft.)
Median
Stone Size
d50
Ft.)
Maximum
Tailwater
Depth
(ft)
NCDOT
Rip Rap

15 6.1 5 7 4 1 0.5 1.1 Class A
18 8.8 5 7 4.5 1 0.5 1.4 Class A
24 15.7 5 9 6 1 0.5 1.7 Class A
30 24.5 5 11 7 1 0.5 2.1 Class A

WELL DEFINED DISCHARGE CHANNEL