TM 5-820-4/AFM 885, Chap 4
Table C-5. Suggested Maximum Cover Requirements for Structural-Plate-Aluminum-Alloy Pipe, 9-Inch Spacing, 2 1/2-Inch
Corrugations
H20 Highway Loading
Suggested Maximum Cover Above Top of Pipe, ft
Circular Section
Thickness, in.
Diameter,
0.225
0.250
0.175
0.20
0.15
0.125
in.
0.10
64
61
48
55
41
24
32
72
41
47
55
20
27
52
84
35
36
41
45
18
24
50
30
96
16
21
44
32
27
37
40
108
29
33
40
14
19
24
36
120
17
26
22
30
36
13
132
33
24
27
12
16
30
33
20
144
28
22
25
14
18
30
156
20
23
26
13
17
28
168
19
22
24
16
26
180
U.S. Army Corps of Engineers
Notes:
1. Structural-plate-aluminum-alloy pipe will conform to the requirements of Federal Specification WWP402.
2. Soil conditions, trench width and bedding conditions vary widely throughout varying climatic and geographical areas.
3. Calculations to determine maximum cover should be made for all individual pipe and culvert installations underlying
roads, streets and open storage areas subject to H20 live loads. Cooper E-80 railway loadings should be independently
made.
4. Cover depths are measured from the bottom of the subbase of pavements, or the top of unsurfaced areas, to top of pipe.
5. Calculations to determine maximum cover for Cooper E80 railway loadings are measured from the bottom of the tie
to the top of the pipe.
6. The number in the class designation for asbestos-cement pipe is the minimum 3-edge test load to produce failure in
pounds per linear foot. It is independent of pipe diameter. An equivalent to the D-load can be obtained by dividing the
number in the class designation by the internal pipe diameter in feet.
7. If pipe produced by a manufacturer exceeds the strength requirements established by indicated standards then cover
depths may be adjusted accordingly.
8. See table C-9 for suggested minimum cover requirements.
C-6
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