Design of Hydraulically Efficient Power-Law Channels with Freeboard
Publication: Journal of Irrigation and Drainage Engineering
Volume 131, Issue 6
Abstract
A power-law channel is a generalized form of the parabolic channel. The exponent of the governing equation is a variable that for certain maximum permissible side slopes can be determined by maximizing the cross-sectional area of flow (or minimizing the wetted perimeter). Using this exponent rather than the constant allows a hydraulically more efficient open channel section to be designed. In earlier work on power-law channels freeboard was neglected to simplify the analysis. However as pointed out by several authors, a channel without freeboard is of academic interest only and not practical. All open channels are in practice designed and constructed with freeboard as a factor of safety. In this paper freeboard has been introduced as an additional parameter to be taken into account when designing a power-law channel. The work from this paper is applied to an earlier example of a parabolic channel to demonstrate a practical design.
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References
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© 2005 ASCE.
History
Received: Nov 25, 2003
Accepted: Aug 19, 2004
Published online: Dec 1, 2005
Published in print: Dec 2005
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