Pipe Diameter
|
Gauge
|
---|---|
15 to 24 inch
|
16
|
30 to 36 inch
|
14
|
42 to 54 inch
|
12
|
60 to 72 inch
|
10
|
78 to 84 inch
|
8
|
Height of Cover
(in feet)
|
Class of Pipe
|
---|---|
0 to 2
|
IV
|
2 to 3
|
III
|
3 to 6
|
II
|