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A landfill is a carefully designed structure built into or on top of the ground, where trash and solid waste is deposited. Landfills keep trash isolated from the surrounding environment by use of a liner, and a daily covering of soil or foam. The two primary types of landfills are sanitary landfills, that use clay liners, and municipal solid waste landfills, that use a synthetic liner. The main parts of a landfill include the bottom liner, the cells where trash is stored, the storm water drainage system that collects rain water, the leachate collection system that collects water than has leached through the landfill, the methane collection system which collects the gas generated during trash breakdown, and the cap that seals the top of the landfill.

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