This comprehensive text is on the geotechnical and geological aspects of the investigations and the design and construction of new dams. In addition, much attention is paid to the review and assessment of existing dams. The main emphasis is on embankment dams, but much of the text can be used for concrete gravity and arch dams. It includes contributions from authors with over 35 years of experience in this field, and will serve as a useful guide to professional dam engineers, engineering geologists and as a textbook for university students.