This work, carried out under the project PON SIGLOD, deals with the development of mathematical models of formation, diffusion and distribution of leachate in large landfills, considered in this project. Recently simulation through mathematical models of some processes concerning both the formation and diffusion of pollutants found a significant benefit to all operators in this sector, because they are able to represent the scenarios and give essential information to “expert systems” that oversee the control and management of these facilities. The models here implemented have provided results that will support the planning and future management of landfills activities. Their initial definition was rather long, since issues relating to physical and chemical phenomena have been addressed...