Terram Geosynthetics are extensively used in civil engineering in the construction of highways - from preventing intermixing of sub-base and subgrade layers, control erosion on cut slopes, for roadside drainage, as part of SUDS projects for infrastructure access and in the construction of retaining walls, bridge abutments and steep slopes.


Terram geocomposite drains are manufactured by bonding a compression-resistant net core between two geotextile filters or between a geotextile and a geomembrane. The grade of net dictates the composite’s flow capacity.

The filter/net/filter composites are used for general area drainage and are easy-to-install, factory-assured replacements for tradition stone installations. The filter/net/membrane composites are used to drain from one side only and provide a barrier to the other – a cut-off drain. Both types can be deployed vertically or horizontally.

Geocomposite drains are preferred to stone as they are less expensive, and much easier to install; particularly against vertical faces such a bridge abutment. They are also lighter and more compact which means lower transportation costs and minimum traffic disruption.

Terram drains have factory-assured properties so there’s no issue of stone grading and consistency. As most stone drains rely on a geotextile to prevent the ingress of fines, it’s simpler to replace the stone with a drainage core such as a net.

Typical drainage applications include:

• Alongside roads
• Within slopes
• Around culverts, basements, reservoirs and other buried structures
• At the rear of retaining walls and abutments
• In the construction of tunnels

Sustainable Urban Drainage Systems (SUDS)

Paved areas and roof gardens require a light and versatile drainage system capable of a high in-plane flow. Terram geocomposite drains offer high flow rates, high compressive strength and good resistance to creep. Their use reduces manpower and minimizes the need for heavy materials making them ideal solutions for these applications.

Back to Highways Overview

Terram geocomposite used for lateral highway drainage
Terram Geotextiles and composites used in SUDs, French and Box drains
Terram geocomposite lateral highway drainage system
Terram drainage composites for retaining structures