Influence of Geometry on Discharge Capacity of Open Channels
Publication: Journal of Hydraulic Engineering
Volume 117, Issue 5
Abstract
An experimental investigation of the influence of cross-sectional geometry on the discharge capacity of rectangular and compound channels is presented. It is found that a wide rectangular channel carries as much as 80% less than a narrow rectangular shape, and as much as 25% less than a compound shape of the same overall width, for the same cross-sectional area, and bed slope. Comparison of friction factors reveals that values in a wide rectangular channel could be as much as 45% greater than in a narrow rectangular section, and as much as 25% greater than in a compound section of the same overall width. The findings show the danger of ignoring shape effects in open channels, and underline the need for a systematic investigation of their influence on discharge capacity.
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References
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Hollinrake, P. G. (1987). “The structure of flow in open channels—a literature search.” Vol. 1, Research Report SR96, Hydraulics Research Ltd., Wallingford, England.
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Hollinrake, P. G. (1988). “The structure of flow in open channels, a literature search.” Vol. 2, Research Report SR 153, Hydraulics Research Ltd., Wallingford, England.
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Myers, W. R. C. (1982). “Flow resistance in wide rectangular channels.” J. Hydr. Div., ASCE, 108(4), 471–482.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 117 • Issue 5 • May 1991
Pages: 676 - 680
Copyright
Copyright © 1991 ASCE.
History
Published online: May 1, 1991
Published in print: May 1991
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