This paper presents a theoretical model to determine the end depthof a free overfall in horizontally laid rough rectangular channels. Amomentum equation based on the Boussinesq approximation was appliedto obtain the equation for the end depth. The effect of streamlinecurvature at the Free surface was utilized to develop theDifferential equation for the flow profile Upstream of the freeoverfall. As direct Solutions for the end depth and flow pro- Filecannot be obtained due to implicit Forms of the developed equations,an auto- Recursive search scheme was evolved to Solve these equationssimultaneously.
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