GEOSYNTHETICS IN LANDFILL CLOSURES DESIGN CONSIDERATIONS

Geomembranes can provide an effective low permeability cover at many sites. Maintenance of overall stability is essential to design performance. The beneficial effects of textured geomembrane, drainage terraces and tensile geogrids are discussed. The use of both vegetative and non-vegetative covers to resist erosion is presented. The effects of construction equipment traffic, freezing, root growth and vermin on the geomembrane are also discussed. Finally, geomembrane penetrations and a closure concept which does not physically join the closure geomembrane to the bottom geomembrane are discussed.