  We prove existence and uniqueness of the flow of water within a confined
aquifer with fractional diffusion in space and fractional time derivative in
the sense of Caputo-Fabrizio. Our main method is the fixed-point theorem. We
propose the numerical approximation of the model. The Crank-Nicolson numerical
scheme was used to solve the modified model. In order to check the
effectiveness of the model, stability analysis of the numerical scheme for the
new model are presented.
