The authors discuss all key aspects of the design of barrier systems, including leachate collection, natural barriers such as clayey aquitards, clay liners, geomembrane and composite liners and so on. They have integrated the engineering and hydrogeological considerations and the design of waste disposal facilities to provide a sound base from which engineers can work. There is also a comprehensive view of modelling as related to practical landfill design, and key studies give examples of actual field performance.