Question

what is low gravity dam

Answer 1

A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by primarily utilizing the weight of the material alone to resist the horizontal pressure of water pushing against it. ... Gravity dams provide some advantages over embankment dams.

Answer 2

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A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by primarily utilizing the weight of the material alone to resist the horizontal pressure of water pushing against it.

According to your question Low gravity dam definition is:
it has a structural height of up to 100 feet.

It depend on their structural height, the gravity dams are classified as low, medium and high dams.
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