gravity dam

a dam resisting the pressure of impounded water through its own weight.

1935–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gravity dam
a dam whose weight alone is great enough to prevent it from tipping over

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The original design called for a gravity dam, but the design was changed and the dam built before the change was approved.
Similarly, a gravity dam with longitudinal joints must have a monolithic section in an upstream-downstream direction.
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