Which feature does a geotextile provide in leachate systems?

Geotextiles are specifically designed to enhance the performance of leachate systems in landfills by serving several crucial functions related to material separation and filtration. The correct choice highlights that geotextiles prevent the ingress of fine particles, which is essential for maintaining the integrity of the leachate system.

In a leachate system, the primary goal is often to manage and contain the liquid that drains from the landfill, enabling its safe transport and treatment. Fine particles, if allowed to enter the system, could clog drains and other components, leading to potential failure of the system. The geotextile acts as a filter, allowing liquids to pass through while acting as a barrier to unwanted solids. This separation helps maintain the efficiency and functionality of the leachate system.

The other options, while they may have their own relevance in different contexts, do not specifically address the primary role of geotextiles within leachate systems. For example, aesthetic improvements or thermal insulation do not directly impact the operational effectiveness of leachate management, nor does water retention apply in the same way as filtration in this context.