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F005 LOCAL GRID REFINEMENT FOR BASIN MODELS Abstract 1 The paper presents a new methodology to integrate local refinement in basin models without increase in CPU-time and disk space. A numerical scheme has been developed to integrate these constrains of non-coincidence between grids. Multiple grids with different resolution are considered in a 3D block. This scheme is relatively simple considering that the geometry changes through time. The paper starts with a general introduction on problems to be solved in basin modelling. Then is introduced the local grid refinement with some illustrations of results on a case study. Finally difficulties of