Weir (1) A barrier placed in a channel to divert fish or water. (2) A dam in a river to stop and raise the water, for the purpose of conducting it to a mill, forming a fishpond, or the like. When uncontrolled, the weir is termed a fixed-crest weir. (3) A fence of stakes, brushwood, or the like, set in a stream, tideway, or inlet of the sea, for taking fish. (4) A device for determining the quantity of water flowing over it from measurements of the depth of water over the crest or sill and known dimensions of the device. (5) A bank or levee built to hold a river in its bed, or to direct it into a new bed. (6) (Water Quality) A wall or obstruction used to control the flow from settling tanks and clarifiers to assure a uniform flow rate and avoid Short-Circuiting. Types of weirs include: 1 Broad-crested, 2 Sharp-crested, 3 Drowned, and 4 Submerged.
Source: http://www.bvsde.paho.org/bvsacg/i/fulltext/dicciona/dicciona.pdf
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Author of the Water Words Dictionary source of text: Gary A. Horton
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