Installation Guide

ManualsBrandsAdvanced Drainage Systems ManualsDrain Parts3 in. x 100 ft. Corex Drain Solid Pipe

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IG102 © ADS 2008

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. 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.

Backfill Selection

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

• Class I materials can be dumped around pipe. Lightly tamp or knife 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’ or less, compaction may not be necessary, provided the trench bottom is shaped in

accordance with Figure 2.

Table 1

Classes of Embedment & Backfill Materials

Soil Classification

Description

ASTM

D2321

ASTM

D2487

Min. Compaction

Required (Std.

Proctor Density

(%)

Graded or crushed stone

Crushed gravel

Class I - Dumped

Well-graded sand, gravels,

and gravel/sand mixtures;

Poorly graded sand,gravels

and gravel/sand mixtures;

little or no fines

Class II GW

85%

Silty or clayey gravels,

Gravels/sand/silt or gravels

and/clay mixtures, silty or

clayey sands, sand/clay or

sand/silt mixtures

Class III GM

90%

Inorganic silts and low

to medium plasticity clays;

gravelly, sandy, or silty

clays; some fine sands

Class

IVA

Material Not

Recommended

*Layer Heights should not exceed one-half the pipe diameter. Layer

heights may also need to be reduced to accommodate compaction

method.

INSTALLATION GUIDE

Sin

le Wall HDPE Pi

IG 1.02

January 2008

Summary of content (3 pages)

PAGE 1
INSTALLATION GUIDE Single Wall HDPE Pipe IG 1.02 January 2008 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 Backfill 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 inch (9.5mm) sieve meeting the class I, II, or III requirements of ASTM D 2321.