Which of the following characteristics of geomembranes makes them suitable for landfill applications?

The high impermeability of geomembranes is a critical characteristic that makes them suitable for landfill applications. In the context of landfills, these materials are primarily used as liners to prevent the leachate, which is the liquid that percolates through solid waste, from contaminating groundwater and surrounding soil. The impermeable nature of geomembranes helps to ensure that harmful substances do not migrate out of the landfill, thus protecting the environment and public health.

Additionally, the quality of high impermeability contributes to the overall stability and efficiency of a landfill by managing the containment of liquids, optimizing waste decomposition, and minimizing environmental impact. While other characteristics, such as flexibility, recyclability, or cost, may have their advantages, it is the impermeability that fundamentally addresses the primary functional requirement for landfill liners.