Installation Guide

ManualsBrandsAdvanced Drainage Systems ManualsDrains3 in. x 10 ft. Corex Drain Pipe Solid

Single Wall HDPE Pipe

Installation Guide

The recommendations presented here detail how to install a dependable subsurface drainage or

groundwater control system. Installation with proper backll materials, compaction levels, and placement

procedures are essential to achieve long term system performance. These recommendations assume

that the drainage designer used design criteria available from ASTM F449 and ADS. The designer should

discuss installations involving conditions not covered by these documents (poor soils, high loads,

or other factors that may affect the performance of the system) with an ADS representative.

Backll Selection

Description

Soil Classicaton Min.

Compaction Required

(Std. Proctor Density

(%)

ASTM D2321 ASTM D2487

Graded or crushed stone

Crushed Gravel

Class I

- Dumped

Well-graded sand, gravels,

and gravelsand mixtures:

Poorly graded sand, gravels, and

gravel/sand mixtures; Little or no

nes

Class II

85%

Silty or clayey gravels, Gravels/

sand/silt or gravels and clay mix-

tures, silty or clayey sands, sand/

clay or sand/silt mixtures

Class III

90%

Inorganic silts and low to medium

plasticity clays; gravelly, sandy, or

silty clays; some ne sands

Class IVA

Material

Not Recommended

• Only native soil meeting class I, II, or III, as described in Table 1, are acceptable backll materials.

• Class I materials can be dumped around pipe. Lightly tamp or knifed to ensure voids are eliminated.

• Non-cohesive sand, sand/gravel mixes and other Class II or III materials must be compacted to remove voids.

• For pipe with burial depths 8’ (2.4 m) or less, compaction may not be necessary, provided the trench bottom

is shaped in accordance with Figure 2.

Table 1: Classes of Embedment & Backll Materials

*Layer Heights should not exceed one-half the pipe diameter. Layer heights may also need to be reduced to accommodate

compaction method.

Summary of content (3 pages)

PAGE 1
Single Wall HDPE Pipe Installation Guide The recommendations presented here detail how to install a dependable subsurface drainage or groundwater control system. Installation with proper backfill materials, compaction levels, and placement procedures are essential to achieve long term system performance. These recommendations assume that the drainage designer used design criteria available from ASTM F449 and ADS.
PAGE 2
Trench Construction • Trench or ditch should be just wide enough to place and compact backfill around the entire pipe. Increasing the trench width increases the soil load on the pipe. Where trench walls are stable or supported, provide a width sufficient, but no greater than necessary, to ensure working room to properly and safely place and compact embedment materials. The space between the pipe and trench wall must be enough for the compaction equipment used in the pipe zone.
PAGE 3
Figure 1 Typical Backfill Structure Alternate Back Fill Methods: Shaped Trench Bottoms Shaped trench bottoms may be used in lieu of the standard trench detail shown in Figure 1, provided a free flowing pea gravel or small rock chips are used to fill in the resultant void areas. Pea gravel or small chips shall be clean material passing a 3/8” (9.5mm) sieve meeting the class I, II, or III requirements of ASTM D 2321.