This study presents a downstream boundary condition for the nonlinear Boussinesq equation (NBE) in an unconfined rectangular aquifer using experimental results, which is often caused by drought flow in a recession period. It is possible to obtain a semianalytical solution for NBE using a series expansion method. The semianalytical solutions are compared with the numerical and experimental results. Their agreement between the semianalytical and numerical solutions and the semianalytical and experimental ones is satisfactory.
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Mizumura et al. (2006) studied this question.
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