Abstract
The water infiltration in vertical unsaturated porous media with constant water flux at the surface is investigated. The orthogonal collocation method is employed for solving the governing nonlinear partial differential equation. The present numerical solutions for water infiltration in the Rehovot sand are in good agreement with the previous ones obtained by the finite-difference method. However, because of its high accuracy, computational stability and easy application, the orthogonal collocation does provide a good alternative for solving the nonlinear water infiltration problems.
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