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Vertical Sluice Gate Discharge Coefficient Original Article, B20 Nasehi Oskuyi N, Salmasi F. Journal. Civil Eng. Urban. 2(3): 108-114. 2012. ABSTRACT:Sluice gates are widely used for flow control and discharge measurement in irrigation and drainage channels. Their discharge coefficient depends on geometric and hydraulic parameters. Errors are inevitable when their values are abstracted from empirical curves for a range of reasons including the resolution of the graphs, judgments in reading the values, the need for their digital values at the computational stages. This study develops two equations, linear and nonlinear, to determine discharge coefficient by using dimensional analysis and linear and nonlinear regression analysis, for both free and submerged flow conditions. A total of 5200 data point was generated, which involved different effective hydraulic parameters. The study also included the results of the past studies carried out by different investigators concerning sluice gate discharge coefficient determination for comparison purposes. The performance of the nonlinear equation improves in comparison with the linear equation. All numerical computations were carried out by Wolfram Mathematica v.6 software. Keywords: Discharge coefficient, free flow, multiple regressing, sluice gate, submerged flow منبع: [Hidden Content] دانلود: [Hidden Content],%20108-114,%202012.pdf JCEU-B20, 108-114, 2012.pdf