Dams have been used to control water for thousands of years, with the oldest known dam being a small earthen structure in present-day Jordan dating to c.4000 BCE. Since then, cultures throughout the world have practised the art of dam-building and the technology has evolved in myriad ways. The papers selected here examine the key technical issues influencing dam construction from ancient times to the early 20th century. In addition they illustrate why various human societies have built dams and how 'social' (or seemingly 'non-technical') factors have influenced the process of dam design. Though hydraulic engineering is the primary focus of the book, it also reveals a keen interest in questions of water resources and environmental history.