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Generalised design of single profile (self basing) weirs

Rangaraj, C and Murthy, KK (1998) Generalised design of single profile (self basing) weirs. In: Journal of Hydraulic Research, 36 (04). pp. 695-706.

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This paper presents a generalised theory and design of a new class of self basing weirs of constant indication accuracy giving a discharge alpha(head)(n) for 1/2 less than or equal to n less than or equal to 3/2. Unlike in the earlier designed compound weirs for n < 3/2, leg., Sutro weir) the weir is defined by a single profile throughout and a portion of the weir above the crest acts as a base. Single profile weirs eliminate the source of error associated with compound weirs arising from the assumption of single value of coefficient of discharge (C-d) for both the base weir and the complementary weir above whereas two separate C(d)s' should be used. The depth of the base weir can be reduced by altering certain parameters to suit the practical considerations. The discharge through this weir for all Bows above a threshold depth "d" and depth of flow "h", is proportional to h(n); 1/2 less than or equal to n less than or equal to 3/2; within a prefixed allow allowable error of +/-1%. The problem is approached by using a hyperbolic function as the discharge generating function. The generalised design presented in this paper allows balancing between the contradictory requirements of accuracy and reduction of afflux in the field. Experiments with three weirs for n = 2/3, n = 3/4 & n = 5/4 confirm the theory by giving a constant average coefficient of discharge for each weir.

Item Type: Journal Article
Publication: Journal of Hydraulic Research
Publisher: International Association of Hydraulic Engineering and Research
Additional Information: Copyright of this article belongs to International Association of Hydraulic Engineering and Research.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 22 Jul 2009 12:19
Last Modified: 22 Jul 2009 12:19
URI: http://eprints.iisc.ac.in/id/eprint/18669

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