ABSTRACT
A groundwater simulation model is a nonunique model due to different sets of assumptions used for simplifying the mathematical description of groundwater flow. This chapter explains numerous numerical methods such as the finite-difference method (FDM), finite element method, and finite volume method have been developed to solve and simulate the numerical models of groundwater flow system in porous media models and their functions. The model accuracy depends upon the level of conceptualization and understanding of the groundwater system as well as the assumptions embedded in the derivation of the mathematical equations. The FDM consists of transforming the partial derivatives in difference equations over a small interval by algebraic expressions written in terms of aquifer characteristics and conditions. Drawing the mesh with the knowledge of the groundwater flow and solute transport process is a helpful way to achieve a groundwater system solution with a reasonable cost for computational burden and acceptable precision.
