Weir 1
Weir 1 : (1) A low dam or wall built across a stream to raise the upstream water level, termed fixed-crest weir when uncontrolled. (2) A structure built across a stream or channel for the purpose of measuring flow, sometimes called a measuring weir or gauging weir. Types of weirs include broad-crested, sharp-crested, drowned, and submerged
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