TM 5820-4/AFM 88-5, Chap 4
1. Corrugated steel pipe will conform to the requirements of Federal Specification WP405.
2. The suggested maximum heights of cover shown in the table are calculated on the basis of the current AASHTO
Standard Specifications for Highway Bridges and are based on circular pipe.
3. Soil conditions, trench width and bedding conditions vary widely throughout varying climatic and geographical areas. --
4. 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 E80 railway loadings should be independently
made.
5. Cover depths are measured from the bottom of the subbase of pavements, or the top of unsurfaced areas, to top of pipe.
6. Calculations to determine maximum cover for Cooper E-80 railway loadings are measured from the bottom of the tie
to the top of the pipe.
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 C9 for suggested minimum cover requirements.
Table C8. Suggested Maximum Cover Requirements for Corrugated Steel Pipe, 3-Inch Span, 1-Inch Corrugations
H-20 HIGHWAY
LOADING
MAXIMUM COVER ABOVE TOP OF PIPE, FEET
DIAMETER,
INCHES
36
53
66
201
98
117
130
101
142
178
56
87
45
84
101
42
112
142
157
122
39
49
76
132
73
88
48
107
122
98
35
78
117
44
65
87
67
110
54
95
31
39
70
78
61
107
58
85
102
60
77
28
36
53
64
71
55
97
101
66
26
33
49
72
58
71
92
96
65
50
78
30
24
45
54
47
84
93
60
65
28
84
78
91
22
42
50
56
43
61
73
90
21
26
47
40
89
39
52
57
96
24
36
44
38
84
49
53
69
102
23
34
79
41
35
64
46
50
108
32
39
75
61
43
47
114
30
37
71
41
58
45
120
29
35
39
55
67
42
U . S. Army Corps of Engineers
C-14
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