Type of dam
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The Itaipu main dam is a concrete dam, of the hollow gravity type. During the initial conception of the project options were studied: solid gravity, hollow gravity, rockfill and in an arc.

After technical and geological evaluation, it was chosen the concrete dam of hollow gravity type for the main dam. The other dam types built at Itaipu, auxiliary dams, such as rockfill and earthfill used rocks and substrate(earth) from local excavations.


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