Weir

A weir at the Thorp grist mill in Thorp, Washington, USA

19th century weir of porphyry stone on a creek in the Alps

A weir /ˈwɪər/ is a barrier across a river designed to alter its flow characteristics. In most cases, weirs take the form of obstructions smaller than most conventional dams, pooling water behind them while also allowing it to flow steadily over their tops. Weirs are commonly used to alter the flow of rivers to prevent flooding, measure discharge, and help render rivers navigable. Weirs are also used in the study of returning salmonids.

单词	Diversion weir
释义	Diversion weir 英语百科 Weir A weir /ˈwɪər/ is a barrier across a river designed to alter its flow characteristics. In most cases, weirs take the form of obstructions smaller than most conventional dams, pooling water behind them while also allowing it to flow steadily over their tops. Weirs are commonly used to alter the flow of rivers to prevent flooding, measure discharge, and help render rivers navigable. Weirs are also used in the study of returning salmonids.
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Diversion weir

Weir