Murthy, Keshava K and Prakash, Shesha MN (1995) Alternative design of square-rooting measuring device in open channel - Closure. In: Journal of Irrigation And Drainage Engineering-Asce, 121 (6). pp. 374-377.
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This paper is concerned with the design of a practical quadratic weir of a simple geometrical shape, having an inward trapezoidal weir of crest width 2 w and vertex angle 2theta, over which a rectangular weir is fitted at an optimum depth p= 0.95 d ( d= overall depth of the inward trapezoidal weir) above the weir crest. It is shown that the flow through this weir is proportional to the square root of head h measured from the datum or reference plane situated at 0.5 d above the crest, for all flows in the range of p<=h<= 2.95 p within a maximum error deviation of ±2% from the exact theoretical discharge. A numerical optimization procedure is developed to obtain the optimum parameters of the weir yielding a maximum quadratic head-discharge relationship. Experiments with two different weirs show excellent agreement with the theory by giving a constant average coefficient of discharge. The application of the weir in the proportionate method of flow measurement using a bypass in an open channel and as a sensitive flow-measuring device in irrigation canals are highlighted.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to American Society of Civil Engineers|
|Department/Centre:||Division of Mechanical Sciences > Civil Engineering|
|Date Deposited:||20 Feb 2009 11:25|
|Last Modified:||19 Sep 2010 05:01|
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