TM 5820-4/AFM 885, Chap 4
Table C6. Suggested Maximum Cover Requirements for Corrugated Steel Pipe, 125-mm
Span, 25-mm Deep Corrugations
H20 Highway Loading
Maximum cover above top of pipe, feet
Helical--thickness,
inches
Diameter,
.138
.168
.109
.079
.064
inches
122
132
95
68
54
48
117
109
84
60
48
54
107
76
98
43
54
60
101
89
69
49
39
66
96
81
63
45
36
72
75
92
58
41
33
78
85
54
70
38
31
84
65
80
50
36
29
90
75
47
61
34
96
57
70
44
32
102
66
42
54
108
63
51
40
114
49
60
38
120
U.S. Army Corps of Engineers
Notes:
1. Corrugated steel pipe will conform to the requirements of Federal Specification
WW-P-405.
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 vary-
ing 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 E80 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.
C7
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