A weir, also known as a low-head dam, is a small overflow-type dam typically used to raise the level of a river or stream. Wires have traditionally been used to construct mill ponds in such places. Water flows over the weir, although some weirs have slide gates, which release water from the top of the weir to the surface below. The crest of an overflow spillway on a large dam is often called a weir.
31.13 Functions of a weir
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