Question

What is the primary function of a geocomposite in a landfill liner system?

Accepted Answer

The primary function of a geocomposite in a landfill liner system is to provide drainage, filtration, and protection to other components of the liner system, most commonly the geomembrane. A geocomposite is a manufactured material combining a geotextile with a geonet, geogrid, or geomembrane. The geotextile acts as a filter, preventing soil particles from clogging the drainage core. The drainage core, often a geonet, provides a path for liquids, such as leachate or infiltrated rainwater, to flow laterally within the liner system. This drainage capacity reduces hydrostatic pressure on the geomembrane, a critical element as excessive pressure can compromise the geomembrane&#x27;s integrity and increase the risk of leaks. By efficiently removing liquids, the geocomposite enhances the overall performance and longevity of the landfill liner system. An example is a geocomposite placed directly above a geomembrane liner; the geotextile layer filters fine soil particles preventing them from entering the geonet drainage core, thus ensuring long-term drainage capacity and protecting the geomembrane from puncture by larger particles within the soil.

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What is the primary function of a geocomposite in a landfill liner system?