The collection and transportation of rainwater, groundwater or other fluids such as leachates and gases is defined as Drainage, and Geosynthetic drainage systems are increasingly being used as a more effective and economic alternative to traditional granular based solutions.

Traditional granular drainage systems are now being replaced by TERRAM drainage geocomposites, manufactured by laminating geotextiles, geonet cores and non-permable membranes to produce a composite product.


In critical structural drainage applications such as basements, bridge abutments and retaining walls, TERRAM® geosynthetics are used extensively, replacing porous concrete blocks, no-fines concrete and other conventional materials.

Typical applications include:
• Landfill Caps
• Retaining Wall Drainage
• Basement Protection
• Highway Drainage
• Verge Toe and Batter Drains
• Bridge Abutments

TERRAM Geocomposite drains are comprised of two or three elements; a filter fabric, a free draining core and a filter fabric or impermeable membrane. They are designed specifically to replace 'traditional' drainage solutions such as low fines graded stone and are highly effective in the collection and conveyance of both liquids and gases.

TERRAM Geocomposite drains are a factory manufactured, low weight, easy to handle, environmentally friendly alternative to 'traditional' drains used in various applications including road and structural drainage, green roofs, Sustainable Drainage Systems (SuDS) and in the collection and venting of landfill leachate and gases.

Design Considerations
• Soil conditions
• Hydrology
• Hydrogeology
• Load conditions



TERRAM geocomposites
B1 Drainage Geocomposite
1BZ Drainage Geocomposite
Installing TERRAM geocomposite drains
RG4 & RG-SD19 Landfill cell side-wall drainage (Bryn Pica LFS)
1B1 - Area drainage beneath artificial playing surface (Portsmouth)
1BZ - Drainage to the rear of a retaining wall (Carluke Park & Ride)