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A weir is also called a low-head dam, so weirs are type of dam. Typically non-regulated so excess water simply flows over the top.
A dam is large (or very large), like the Hoover Dam. A weir is very much smaller and you'd be more likely to find one across a stream than a river.

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7y ago
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14y ago

A river is a flowing body of water. A dam is a obstruction in the river slowing or stoping the flow of water.

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Q: What is a difference between a river and a dam?
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