The problem is formulated for investigating the effect of rainfall on soil deformation. Our model is prepared on the dual permeability concept. Soil domain has been discreatize as the combination of fractures and soil matrix. Fractures represent the macro porous domain and soil matrix represents the micro porous domain. Rainfall water flows directly into fracture while only lateral flow which is considered non-uniform is assumed in soil between fractures.
Water flow through the matrix using mixed form of Richards’s equation