Weirs are commonly used to prevent flooding, measure discharge and help render rivers navigable. ... A common distinction between dams and weirs is that water flows over the top (crest) of a weir or underneath it for at least some of its length. An Up-Stream Regulator is a structure constructed across a canal to regulate the water level in the canal upstream of itself and the discharge passing downstream of it for one or more of the following purposes: (1) To feed offtaking canals located upstream of the cross regulator. (2) To help water escape from canals in conjunction with escapes. (3) To control water surface slopes in conjunction with falls for bringing the canal to regime slope and section. (4) To control discharge at an outfall of a canal into another canal or lake.
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Weirs / Up-Stream Regulators
Hendry's Concrete & Construction, LLC.