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A theoretical and experimental analysis of curvilinear flow in open channels is presented. The pressure head coefficient and pressure force coefficient used to account for curvature effects utilizing the energy approach and the momentum approach, respectively, are shown to be related by a simple expression. By virtue of this expression and the relative ease with which the pressure force coefficient is usually obtained, the energy approach can now be readily applied to analyze curvilinear flow problems. Verification of this expression is based on curvilinear flow experiments conducted on simple bottom openings and on available data for the limiting case of a free overfall.
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Nasser et al. (1980) studied this question.
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