The crest of an overflow spillway on a large dam is often called a weir. Ī weir may be used to maintain the vertical profile of a stream or channel, and is then commonly referred to as a grade stabilizer such as the weir in Duffield, Derbyshire, England, UK. Air must also freely circulate under the nappe as discharge errors of as much as 25% may occur if the nappe is not adequately ventilated. Roughness of any form will cause the weir to discharge more water than indicated by the standard discharge equations or tables. #Vibert simmonds weirs rapidshare free#When used for flow measurement it is important that the weir crest be kept free of rust or nicks. 3/2 for horizontal weir, 5/2 for v-notch weir) H is the height of head of water over the crest.If water is not carried away from the weir, it can make flow measurement complicated or even impossible. The calculation relies on the fact that fluid will pass through the critical depth of the flow regime in the vicinity of the crest of the weir. Since the geometry of the top of the weir is known and all water flows over the weir, the depth of water behind the weir can be converted to a rate of flow. Weirs allow hydrologists and engineers a simple method of measuring the volumetric flow rate in small to medium-sized streams or in industrial discharge locations. A weir at the Thorp grist mill in Thorp, Washington, USA
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