TERRAM Geosynthetics provides the critical properties for geosynthetics used in landfill engineering; Robustness to withstand installation and service life. Puncture resistance to protect the liner from puncture. Extensibility to adapt to point loads without failing. Chemical resistance for sustained contact with leachate. UV resistance for the period before the product is covered by waste.


TERRAM products: robust protection for impermeable liners, drainage to collect/convey gas & run-off, geocell slope stabilisation

The design of a cap can be multi faceted requiring careful consideration of factors such as size, shape and gradient to ensure performance. Over time, as the waste in the cell decomposes, settlement may well be experienced thereby modifying the original parameters. The design must therefore be capable of accommodating these changes without detriment to performance.

Capping applications for TERRAM geosynthetics
A landfill cap should include protection above and below the impermeable liner. Drainage layers, both above and below the liner, may well also be required in order to collect and convey rainwater and gas (respectively).

The rate and quantity of rain falling on the cap needs to be considered when designing the drainage requirement together with the volume of water that will be shed at the surface and the amount that will infiltrate the restoration soil layer.  The in-plane flow capacity of the drainage system must be neither too slow to cause soil saturation and destabilisation, nor too quick for the collection system into which the drainage layer flows.

TERRAM robust geotextiles possess the necessary puncture resistance required to protect the capping liner from mechanical damage.  TERRAM drainage composites, based on nets and band drains, are proven as light-weight, easy-to-install alternatives when compared with stone.  With their factory-controlled properties, they ensure a consistent level of In-plane flow.

Drainage can be incorporated within the robust geotextiles, to combine the functions of protection and drainage – one simple-to install product instead of two.

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TERRAM robust geotextiles used in landfill capping applications
TERRAM drainage geocompsites used in landfill capping