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Discharge Coefficient of Side Weirs. Experimental Study and Comparative Analysis of Different Formulas

Author(s): Antonio N. Pinheiro; Isabel N. Silva

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Keywords: Side Weir; Discharge Coefficient

Abstract: The flow in channels with side weirs was studied by several authors since the beginning of this century. Most of these studies were motivated by the wide use of this type of hydraulic structure in irrigation and sewerage systems and by the need to improve the knowledge about its hydraulic performance. The present paper presents six expressions, of different authors, to compute the discharge coefficient of side weirs based on experimental facilities with rather different sizes. The main characteristics of an experimental facility built at the National Laboratory for Civil Engineering (LNEC) to study the discharge coefficient of side weirs is briefly described. A summary of the measurements carried out is included. Finally, a new three parameter expression to compute the discharge coefficient of the side weir and its comparison with expressions proposed by other authors are presented. The discrepancies of the results are analysed considering the geometry differences between the several facilities.


Year: 1999

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