The diagram shows the design of a modern landfill for household waste.

The diagram shows the life cycle of a modern

landfill

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used for the disposal of household

waste

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. There are three main stages in the life of a

landfill

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; the construction, the use of, and the closure.

Firstly

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, a giant hole is dug in the earth above a bed of natural rock. Once the hole has been dug, it is

then

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lined with a thick layer of clay, followed by a layer of synthetic material which helps to stop toxic

waste

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substances from leaching into the surrounding earth.

Drainage

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pipes and a

drainage

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tank are

also

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installed in order to remove the toxic

waste

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liquids from the bottom of the

landfill

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. Once the

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landfill

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land

has been built, it is ready to be filled with household

waste

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. During the usage stage of the

landfill

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,

waste

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liquids will sink to the bottom where they will be held in the

drainage

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tank and removed via the

drainage

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pipes in order to minimise a build-up of gas. Once the

landfill

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is full, it is covered with a thick layer of clay. As the

waste

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degrades over time,

waste

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gases are emitted from the

landfill

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.