Design of Hydraulically Efficient Power-Law Channels with Freeboard |
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Authors: | Arif A. Anwar Derek Clarke |
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Affiliation: | 1Lecturer, School of Civil Engineering and the Environment, Univ. of Southampton, Highfield, Southampton SO17 1BJ, U.K. E-mail: a.a.anwar@soton.ac.uk 2Lecturer, School of Civil Engineering and the Environment, Univ. of Southampton, Highfield, Southampton SO17 1BJ, U.K. E-mail: d.clarke@soton.ac.uk
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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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Keywords: | Channels Canals Optimization Cross sections Channel design |
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