POLYETHYLENE DOUBLE WALL CORRUGATED PIPE CULVERT
DIAMETER (IN) AREA
(SQ FT)
ALLOWABLE
MAXIMUM COVER (FT)
12 08 21
15 12 21
18 18 20
24 31 20

NOTE: For details of bedding for Polyethylene Pipe Culvert see Standard PB-1.

POLYVINYLCHLORIDE RIBBED PIPE CULVERT
DIAMETER (IN) AREA
(SQ FT)
ALLOWABLE
MAXIMUM COVER (FT)
18 17 20
21 23 19
24 30 19
30 47 18
36 69 18
48 123 18

NOTES: Cover heights indicated in tables are for finished construction. To protect pipe during construction, minimum height of cover to be as follows prior to allowing construction traffic to cross installation:

Pipe Diameter Minimum Fill height During Construction**
12" to 30" 1"-6"
36" and above Diam
2

Minimum finished height of cover to be 1/8 Diam. or 1'-0", whichever is greater, except pipe under entrances, median crossovers, street and secondary connections where a 9" minimum will be permitted for pipe up to 24" diameter.

** The cover shall extend the full length of the pipe. The approach fill is to extend a minimum of (10 x Dia + Dia) on each side of the structure, or to the intersection with a cut.

The allowable fill tables shown are based on a soil modulus of 700 psi. All other design criteria are in accordance with the 1983 AASHTO Specifications and VDOT Modifications for Soil Thermoplastic Pipe Interaction Systems.

PLASTIC PIPE
(compare to Vitrified Clay)

 

Source: Virginia Department of Transportation


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