Research Article
May 1978
Modified Proportional V-Notch Weirs
Publication: Journal of the Hydraulics Division
Volume 104, Issue 5
Abstract
Seven different shaped modified proportional V-notches were designed and pertinent data for their use are given in tables 1 - 4. It is shown that the indication accuracies of these weirs are more than that of the conventional V-notch. For five of the designed weirs the indication accuracies are more than that of the conventional rectangular weir at lower heads of flow. All these proportional weirs, except the parabolic based weir, have added advantages over the V-notch in regard to fixing and finding the crest level. Experiments with five weirs (four symmetrical and one unsymmetrical) having rectangular bases and one (symmetrical) with a parabolic base show very good agreement with the theory and give consistent values for the coefficient of discharge, Cd, varying between 0.588 and 0.605, within the ranges of the experiments.
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Published In
Journal of the Hydraulics Division
Volume 104 • Issue 5 • May 1978
Pages: 775 - 791
Copyright
© 1978 American Society of Civil Engineers.
History
Published in print: May 1978
Published online: Feb 3, 2021
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K. Keshava Murthy
Asst. Prof., Civ. Engrg. Dept., Indian Inst. of Sci., Bangalore, India
K. Gopalakrishna Pillai
Asst. Prof., Civ. Engrg. Dept., N.S.S. Coll. of Engrg., Palghat, Kerala, India
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