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An adit is a horizontal tunnel used in mining. They're not directly related to dams but in the construction of Hoover Dam a number of adits were used to facilitate the construction of the various tunnels associated with the dam. For example, adits were cut into the center of the canyon for the diversion tunnels allowing the tunnels to be cut faster; instead of just two work faces (upstream and downstream) an adit was cut and work started in the middle. That allowed four working faces on each tunnel: upstream portal, adit to upstream portal, adit to downstream portal, downstream portal.

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Q: What is adit in dam?
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