Discharge Coefficient of a Trapezoidal Broad-Crested Side Weir for Low Approach Froude Numbers
Publication: Journal of Hydraulic Engineering
Volume 140, Issue 8
Abstract
Even though broad-crested side weirs have been subjected to numerous studies, guidance for discharge coefficient determination for broad-crested side weirs still has not been clearly given. Experimental research was carried out to describe the flow conditions in front of a trapezoidal broad-crested side weir at low Froude numbers in the approach channel for various combinations of inflow and overflow discharges. Three side weir variants with different oblique angles were studied. Flow characteristics at the side weir were analyzed and assessed based on the results obtained from extensive measurements performed on a hydraulic model. The empirical relation between the coefficient of obliqueness, the angle of side weir obliqueness, and Froude numbers upstream and downstream of the weir was derived.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
This study was supported by the Ministry of Industry and Trade under the project New Progressive Rehabilitation Technologies of Dikes and Embankment Dams, project code FR-TI4/335.
References
Aghayari, F., Honar, T., and Keshavarzi, A. (2009). “A study of spatial variation of discharge coefficient in broad-crested inclined side weirs.” J. Irrig. Drain., 58(2), 246–254.
Borghei, S. M., Jalili, M. R., and Ghodsian, M. (1999). “Discharge coefficient for sharp-crested side weir in subcritical flow.” J. Hydraul. Eng., 1051–1056.
Bos, M. G. (1989). Discharge measurement structures, International Institute for Land Reclamation and Improvement (ILRI), Wageningen, Netherlands.
Castro-Orgaz, O., and Hager, W. H. (2012). “Subcritical side-weir flow at high lateral discharge.” J. Hydraul. Eng., 777–787.
De Marchi, G. (1934). “Saggio di teoria del funzionamento degli stramazzi laterali (o sfioratori longitudinali).” L’Energia Elettrica, 11(11), 849–860.
Emiroglu, M. E., Agaccioglu, H., and Kaya, N. (2011). “Discharging capacity of rectangular side weirs in straight open channels.” Flow Meas. Instrument., 22(4), 319–330.
Forchheimer, P. (1930). Hydraulik, 3rd Ed., Teubner verlagsgesellschaft, Leipzig, Berlin, 406–408.
Frazer, W. (1957). “The behaviour of side weirs in prismatic rectangular channels.” Proc. Inst. Civ. Eng., 6(2), 305–328.
Fritz, H. M., and Hager, W. H. (1998). “Hydraulics of embankment weirs.” J. Hydraul. Eng., 963–971.
Goodarzi, E., Farhoudi, J., and Shokri, N. (2012). “Flow characteristics of rectangular broad-crested weirs with sloped upstream face.” J. Hydrol. Hydromech., 60(2), 87–100.
Hager, W. H. (1987). “Lateral outflow over side weirs.” J. Hydraul. Eng., 491–504.
Honar, T., and Javan, M. (2007). “Discharge coefficient in oblique side weirs.” Iran Agric. Res., 25–26(1–2), 27–36.
International Standards Organization (ISO). (1985). “Liquid flow measurement in open channels by weirs and flumes. V-shaped broad-crested weirs.” ISO 8333:1985, ISO, Geneva, Switzerland.
International Standards Organization (ISO). (1999). “Hydrometric determinations–Flow measurement in open channels using structures—Trapezoidal broad-crested weirs.” ISO 4362:1999, ISO, Geneva, Switzerland.
Pařílková, J., Říha, J., and Zachoval, Z. (2012). “The influence of roughness on the discharge coefficient of a broad-crested weir.” J. Hydrol. Hydromech., 60(2), 101–114.
Ranga Raju, K. G., Prasad, B., and Gupta, S. K. (1979). “Side weir in rectangular channel.” J. Hydraul. Div., 105(5), 547–554.
Roger, S., et al. (2009). “Experimental and numerical investigations of dike-break induced flows.” J. Hydraul. Res., 47(3), 349–359.
Rosier, B. (2007). “Interaction of side weir overflow with bed-load transport and bed morphology in a channel.” Ph.D. thesis, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Stilmant, F., Pirotton, M., Archambeau, P., Roger, S., Erpicum, S., and Dewals, B. (2013). “Dike-break induced flows: A simplified model.” Environ. Fluid Mech., 13(1), 89–100.
Tracy, H. J. (1957). Discharge characteristics of broad-crested weirs, U.S. Dept. of Interior, Geological Survey Circular, Washington, DC.
Vatankhah, A. R. (2012). “Analytical solution for water surface profile along a side weir in a triangular channel.” Flow Meas. Instrument., 23(1), 76–79.
Yahya, A. A. A. (2011). “Discharge coefficient for V-notch broad crested side weir.” Al-Rafidain Eng., 19(3), 104–111.
Zachoval, Z., Böhm, P., Pařílková, J., Šafář, R., and Šulc, J. (2013). “Shape of the nappe during free overfall from a rectangular channel with zero bed slope.” J. Hydrol. Hydromech., 61(3), 222–231.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 140 • Issue 8 • August 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Mar 13, 2013
Accepted: Feb 12, 2014
Published ahead of print: Apr 1, 2014
Published online: Apr 2, 2014
Published in print: Aug 1, 2014
Discussion open until: Sep 2, 2014
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.