A weir /ˈwɪer/ is a barrier across a river designed to alter its flow characteristics.

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Photo credit: © Paul Rookes / Alamy / Afripics
License: Royalty Free
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Keywords: cascade, clean, conserve, construction, cool, dam, dam., environment, fall, flood, flow, flowing, landscape, nature, overflow, overfull, rapid, river, spillway, spray, stream, water, waterfall, weir