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Capping

Once a landfill cell has been filled with waste it needs to be capped with a final cover system that keeps out liquid infiltration and provides effective management of gasses.

Final Cover Systems in Landfill

The standard components within a final cover system
  • An erosion control layer (top soil)
  • A protection layer
  • A drainage layer
  • A barrier layer
  • A gas venting layer
  • A foundation layer

 

Design practices vary from site to site and as a result of national regulation and local conditions. State of the art design in landfill engineering has evolved from the use of natural soils to factory manufactured geosynthetics which allow for improvements in safety, reduced environmental impact and economic savings.

Combined protection and drainage can be achieved using GEOfabrics GPT composites, manufactured from 100% prime grade virgin polymer offering proven durability. GPT composites can also be used below a capping membrane to provide an effective pathway for control and extraction of landfill gasses.

GPT composites have been designed to provide a combination of membrane protection and drainage, offering a robust passage for both liquids and gasses.

Manufactured from GEOfabrics HPS geotextiles, with proven performance in the protection of geomembranes and synthetic prefabricated strip drains at 0.5 or 1m. The strip drains are manufactured from 100% prime grade virgin polypropylene with run channels along the whole length on both the upper and lower surface.

The drainage core is surrounded by a strong durable filter that combines high permeability with an excellent impassable soil barrier (only 100% virgin polymer is a guarantee of product durability).

Benefits:

  • Guaranteed drainage performance – even with large deformation and soil pressure
  • Excellent durability – guaranteed as 100% prime grade virgin polymer
  • Meets all Environment Agency requirements for drainage composites
  • Tested to 100 years durability to all EN standards
  • Manufactured from HPS Geotextiles with prove performance in membrane protection
  • Excellent interface friction properties

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