The basic parts of a landfill

Bottom liner system - separates trash and subsequent leachate from groundwater

Cells (old and new) - where the trash is stored within the landfill

Storm water drainage system - collects rain water that falls on the landfill

Leachate collection system- collects water that has percolated through the landfill itself and contains contaminating substances (leachate)

Methane collection system - collects methane gas that is formed during the breakdown of trash

Covering or cap - seals off the top of the landfill

This cross-section drawing shows the structure of a municipal solid waste landfill. The arrows indicate the flow of leachate.