What are geocomposites typically used for in leachate collection systems?

Geocomposites are engineered materials that combine different components to provide enhanced performance in leachate collection systems. They are particularly valuable because they can serve as a drainage layer and filtration medium. When used in leachate collection systems, geocomposites effectively manage the flow of leachate while preventing the clogging of drainage systems.

The correct answer highlights the versatility of geocomposites, as they can be used in place of or alongside traditional materials such as sand and gravel. This flexibility allows for improved design and operational efficiency, as geocomposites can optimize leachate management processes while reducing the volume of natural materials needed. They can offer enhanced hydraulic performance, better filtration, and reduced weight compared to conventional systems, making them suitable for various site conditions and engineering requirements.

The other options do not accurately represent the role of geocomposites. For instance, geocomposites are not limited to being used only with gravel; they have broader applications. They do not replace the need for any drainage but instead augment existing drainage systems to improve functionality. Lastly, geocomposites are widely used across different scales, not just limited to small-scale applications, demonstrating their adaptability in landfill operations.