TERRAM Geocomposite Drains

Application Function

Drainage | Ground Stabilisation

Market Sectors

Highways | Landfill


1A1, 1B, 1B1, 1BH1, 1BZ, 1C1, 1D1, 1DL1 & 1E1

TERRAM Geocomposite drains are manufactured by bonding together textiles, membranes and nets in site specific combinations to create easier-to-install replacements for conventional granular layers. 

The textile layer provides the filter function which allows liquids and gases to pass into the net core but prevents soil particles from washing into and clogging the core. The net layer collects the liquids and gases which can then be conveyed to collection points. Membrane layers are used to provide the barrier function and prevent the passage of liquids and the majority of gases.

A composite must be:
• robust to survive installation and service life
• stable under load to resist deformation that could ultimately restrict flow
• chemical resistant

The filter layer must:
• possess an apparent pore size to suit the soil and prevent
the ingress of fines
• provide sustained performance without blocking

TERRAM geocomposite drains are proven to satisfy these criteria and stand the test of time. The products have established an impressive track record in building and construction projects across the world for over forty years.

The benefits of using Terram composite drains include:
• high-volume flow paths for liquids and gases
• lightweight and easy to handle
• quick and easy to install
• cost-effective replacement for primary natural resources
• manufactured in the UK to high standards using state-of-the-art lines
• reduced environmental impact by avoiding the use of natural-occurring minerals
• lower haulage costs, lower material costs and lower installation costs

Typical applications for Terram Geo-composite drains include:
• Highways: vertical edge-of-carriageway drains to intercept the lateral flow of ground water. Modern fin drains reduce excavation, reduce backfill quantities and reduce installation time. In-slope drainage increases geotechnical stability.

• Retaining walls and bridge abutments: to reduce pore water pressure and avoid backfill saturation.

• Engineered landfills: with the additional requirement of long-term chemical resistance and high compressive strength.

• Tunnels: ground-water-seepage interception between rock face and the tunnel lining.

• Buried structures: vertical and horizontal drains for basements, culverts, car parks, reservoirs, etc.

• Roof gardens: this growing application requires lightweight components capable of high in-plane flow, good resistance to creep and high flow rates.

B1A1A1B11BZ1C11D11D1 light1E1
Roll Width (m)2.0/3.8*/4.02.0/3.8*/4.02.0/3.8*/4.02.0/3.8*/4.02.0/3.8*/4.02.0/3.8*/4.02.0/3.8*/4.02.0/3.8*/4.0
Roll Length (m)25/50/10025/10025/50/10025/50/10025/50/10025/5025/50/10025/50


TERRAM Highways & Roads
TERRAM geocomposites
Standard Geocomposites
B1 Drainage Geocomposite
1BZ Drainage Geocomposite
TERRAM SD Robust geocomposite drains
Installing TERRAM geocomposite drains
BODPAVE 85 Porous car parking (SparkOne Bristol)
1B1 - Area drainage beneath artificial playing surface (Portsmouth)
1BZ - Drainage to the rear of a retaining wall (Carluke Park & Ride)