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Liner Protection & Drainage Composites

GEOfabrics LFX composite replaces half of the granular blanket with a multi-layer factory manufactured geosynthetic that combines the drainage and membrane protection functions into one easy to install product.

Combined Basal Drainage & Membrane Protection

Modern landfill design requires a leachate drainage layer up to 500mm thick at the base of the cell. This fills hard won void space with equally hard won primary drainage aggregate.

GEOfabrics LFX is a composite drainage layer to be used in conjunction with only half the depth of aggregate whilst maintaining the same leachate extraction performance.

LFX provides numerous benefits to landfill engineering:

  • Reduces use of expensive and scarce primary aggregate
  • Void saving to allow more efficient and productive use of space
  • Reduced haulage of construction materials to site – a single truck of LFX can replace up to 90 trucks of aggregate, delivering benefits to both client and contractor
  • Using the composite means much lower material, transport and installation costs
  • The CQA inspection can be carried out in a factory environment
  • The drainage core has a proven flow rate and has been tested up to 1000kPa allowing for use in the deepest landfills.

GEOfabrics LFX composites provides two functions: protection of the underlying geomembrane and replacement of half of the drainage blanket. To assess the suitability of LFX for a specific site it is recommended that a Cylinder test should be conducted to simulate site conditions and thereby select an appropriate grade for membrane protection. Our LFX stone grading table can be used for a preliminary assessment.

The design should consider the long-term performance of the drainage blanket. The LFX grade selected should have drainage characteristics equivalent to those of the stone drainage blanket it replaces. It should also be demonstrated that the leachate system is appropriate for its management within the site by calculating a Factor of Safety (FS) for the LFX grade’s flow capacity for the application, using this formula:

Factor of Safety (FS) = QLFX / Qreqd

where QLFX is the residual flow rate in the LFX after applying reduction factors and Qreqd is the flow rate required from the LFX.

For detailed guidance on this please download our LFX design documents or contact us for assistance.

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Design Information

LFX Stone Selector Guidance

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Wardell Armstrong Pilsworth Report – LFX

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LFX Design Guidance for EA Submission

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LFX Background to Development

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