A weir ( /ˈwɪər/) is a small overflow dam used to alter the flow characteristics of a river or stream.

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A weir ( /ˈwɪər/) is a small overflow dam used to alter the flow characteristics of a river or stream. In most cases weirs take the form of a barrier across the river that causes water to pool behind the structure (not unlike a dam), but allows water to flow over the top. Weirs are commonly used to alter the flow regime of the river, prevent flooding, measure discharge and to help render a river navigable.

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Location: workman creek, Arizona.
Photo credit: © Morey Milbradt / Alamy / Afripics
License: Licensed
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