arch dam

a dam resisting the pressure of impounded water by an arch principle, especially a dam having in plan the form of a single arch abutted by natural rock formations. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arch dam
a dam that is curved in the horizontal plane and usually built of concrete, in which the horizontal thrust is taken by abutments in the sides of a valley. Arch dams must be built on solid rock, as a yielding material would cause a failure

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
It is by far the biggest of the four dams built so far that when done this year
  will be the biggest arch dam in the world.
The concrete arch dam was recorded as being the highest in the world when
Considering the multiple arch dam: theory, practice and the ethics of safety in
  a case of innovative hydraulic engineering.
Upon its completion, this project became the largest multiple arch dam in the
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