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

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'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.