Characteristics of Circular‐Crested Weir
Publication: Journal of Hydraulic Engineering
Volume 119, Issue 9
Abstract
The circular‐crested weir is used for flow measurement and has wide applications in hydraulic engineering, where it serves as an overflow structure. It can be used to control the water level in farm ponds and reservoirs. The discharge coefficient of such a weir is obtained experimentally as a function of the dimensionless total head of the approaching flow. It is shown that changing the upstream slope does not alter the weir‐discharge coefficient. However, increasing the downstream weir slope appears to increase the discharge coefficient. The weir crest pressure is determined as a function of the dimensionless head and its variation is related to the weir‐discharge coefficient. The experimental data indicate that the circular‐crested weir behaves like a sharp‐crested weir, when the dimensionless total head is extremely large.
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References
1.
Bos, M. G. (1978). “Discharge measurement structures.” Publ. 20, Int. Inst. for Land Reclamation and Improvement, Wegeningen, (ILRI), The Netherlands.
2.
Cassidy, J. J. (1965). “Irrotational flow over spillways of finite height.” J. Engrg. Mech. Div., ASCE, 91(6), 155–173.
3.
Escande, L., and Sananes, F. (1959). “Étude des seuils déversants à fente aspiratrice (Weirs with suction slots).” La Houille Blanche, 14(Special B), 892–902.
4.
Matthew, G. D. (1963). “On the influence of curvature, surface tension and viscosity on flow over round‐crested weirs.” Proc. of the Inst. of CE, 25, 511–524.
5.
Seshadri, S. (1981). “Flow characteristics of hydrofoil weirs, hydrofoil topped weirs and streamlined triangular profile weirs,” PhD thesis, Indian Institute of Science, Bangabre, 012, Karnataka State, India.
6.
Sinniger, R., and Hager, W. H. (1985). “Flood control by gated spillways.” Commission Internationale des Grands barrages, 15e Congrès des barrages, Int. Commission on Large Dams, Q.59(R.9) 121–149.
7.
Verwoerd, A. L. (1941). “Calcul du débit de déversoirs dénoyés et noyés à crête arrondie.” L'Ingénieur des Indes Néerlandaises, 8, 65–78.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 119 • Issue 9 • September 1993
Pages: 1055 - 1062
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Sep 8, 1992
Published online: Sep 1, 1993
Published in print: Sep 1993
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