Filter separators

Filter separators

Geosynthetics continue to play an increasingly important role in providing solutions to enhance the protection offered to our fragile environment.

TERRAM geotextiles are used to separate granular layers of stone in construction and civil engineering applications for railway permanent way, highways and roads, car parks and many other applications. Geotextiles are permeable to filter water, but stop particles from mixing with other layers.


Typical applications include:

• Permeable Pavements
• Wrapping Infiltration Structures
• Coastal Erosion Protection
• Scour Control
• Green Roofs
• Grass Paved Areas

It is possible to treat filtration and drainage as two entirely separate issues when using Geotextiles. A geotextile correctly specified according to its hydraulic properties will generate a filter zone preventing small particles passing through causing issues such as siltation, whatever the application.

In addition, modern, engineered geotextiles can go far beyond simply filtering fines from the system. Within the TERRAM Standard Geotextile range there are products specifically developed to filter pollutants in the fluids, preventing them from entering the underlying soils and contaminating groundwater. In specific circumstances, some of these pollutants can be degraded to safe elements by naturally occurring microbes.

TERRAM geotextiles are increasingly being employed in ever more complex drainage solutions due to the increasing knowledge of geotextile performance and the ability to manufacturer with greater accuracy.

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

TERRAM geotextile separate construction materials and filter water
TERRAM Geotextile drainage
TERRAM geotextile in railway applciations


TERRAM Highways & Roads
TERRAM Railways
TERRAM Standard geotextiles
TERRAM Robust geotextiles