Best Hydraulic Section of a Composite Channel
Publication: Journal of Hydraulic Engineering
Volume 133, Issue 6
Abstract
The half-circle is the ideal shape of the best hydraulic section of open channels, but semicircular channels are not practical to construct. The semicircular section is approximated by a composite section that is composed of a trapezoidal section at the bottom and a rectangular section at the top. Such a composite channel can be easily constructed in rocks. This technical note presents an analysis for determining the channel proportions that yield a minimum wetted perimeter for a given flow area of the composite channel. The results of the analysis show that the best hydraulic section has the shape of a half-octagon for composite channel and a composite section is more efficient than a trapezoidal section.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
The writer gratefully acknowledges Professor Subhash C. Jain, University of Iowa, for his valuable comments and help in the preparation of this paper. The writer is also grateful to the reviewers for their useful comments and suggestions.
References
Douglas, E. J. F., Gasiorek, J. M., and Swaffield, J. A. (2001). Fluid mechanics, 4th Ed., Pearson, Edinburgh Gate, U.K.
Fox, R. W., and McDonald, A. T. (1994). Introduction to fluid mechanics, 4th Ed., Wiley, New York.
Guo, J. C. Y., and Hughes, W. (1984). “Optimal channel cross section with freeboard.” J. Irrig. Drain. Eng., 110(3), 304–314.
Jain, S. C. (2001). Open-channel flow, Wiley, New York.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 133 • Issue 6 • June 2007
Pages: 695 - 697
Copyright
© 2007 ASCE.
History
Received: Nov 8, 2005
Accepted: Aug 9, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.