Illustrating the importance of understanding hydrological processes and pathways as a means of effective and safe management, this work describes current management practices, past environmental impact, options for improving water supply and protecting the environment. The book places emphasis on the need for international collaboration in a changing societal and environmental context. Key topics discussed include: the interrelationship between water supply and hydrological processes at local, regional and global levels; the value of monitoring and modelling methods for protecting water supplies and the environment; floods and droughts, in the context of risk assessment and management of strategies; and the potential impacts of "hydropolitics" and global warming.