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Alternative design of square-rooting measuring device in open channel - Closure

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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Abstract

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
URI: http://eprints.iisc.ernet.in/id/eprint/18274

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