Experiments on Discharge Equations of Compound Broad-Crested Weirs
Publication: Journal of Irrigation and Drainage Engineering
Volume 135, Issue 4
Abstract
A linear combination of traditional discharge equations for simple rectangular and/or triangular weirs is proposed to describe the discharge equations of compound broad-crested (CBC) weirs. The CBC weirs are composed of rectangular, triangular, and/or truncated triangular weirs. Dimensionless discharge equations have been also derived. Laboratory experiments on discharge relations for flows over four CBC weirs were conducted in this study in order to calibrate the proposed discharge equations. The experiments were carried out under the conditions of the -ratio of water heads above upper and lower crests less than 0.54, and a dimensionless discharge less than 2.174. The result shows that the differences between the calculated discharges by the proposed equations and the measured ones are less than 3% for flows over these CBC weirs under the present experimental conditions.
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Acknowledgments
Experiments were conducted at the Institute of Planning and Hydraulic Research, Water Resources Agency, Ministry of Economic Affairs in Taiwan. The partial support from the National Science Council in Taiwan (No. UNSPECIFIED96-2625-Z-006-014) to C.-D. J. is also acknowledged.
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Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 135 • Issue 4 • August 2009
Pages: 511 - 515
Copyright
© 2009 ASCE.
History
Received: Jan 2, 2008
Accepted: Nov 8, 2008
Published online: Jan 26, 2009
Published in print: Aug 2009
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