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A long-term large-scale variably-saturated subsurface numerical solution of flow and transport are conducted and presented as a simple and fast computational method. Therefore, it is appropriate to develop such a simplified model that focus on the main processes operating at the pertinent time and space scales, based on the error introduced by the simpler model which is acceptable and also was compared to the uncertainties associated with the spatial and temporal variation of boundary conditions. To assess leachate transport as contamination potential it requires calculation of drainage water volume and contamination concentration. A practical, quantitative pollution transfer assessment tool can be developed to enable technical service providers and other practitioners to estimate potential pollution transfer and design best management practices for land waste management pollution systems in order …