Broad‐Crested Weir
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Volume 120, Issue 1
Abstract
The flow features over the broad‐crested weir with vertical upstream wall and sharp‐crested corner are analyzed experimentally. Only the long‐crested weir is considered, for which the discharge coefficient remains practically constant. For a relative overflow depth between 10% and 40%, the surface profile, the bottom pressure profile, the boundary separation profile, and the velocity profiles close to the upper corner are self‐similar, provided effects of scale may be dropped. For extremely long‐crested weirs, undular flow occurs. The first wave profile is shown to be identical with the solitary wave profile. The main properties of the undular hydraulic jump are explored. The broad‐crested weir is characterized by insensitivity to tailwater submergence. The modular limit is found practically constant at 75% of the tailwater level, independent of the relative head on the weir. The discharge‐head relation for submerged flow is analyzed under a novel approach. Finally, recommendations are specified under which a broad‐crested weir may be used as a discharge measurement structure.
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Published In
Journal of Irrigation and Drainage Engineering
Volume 120 • Issue 1 • January 1994
Pages: 13 - 26
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Jul 15, 1992
Published online: Jan 1, 1994
Published in print: Jan 1994
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