This book contains a selection of papers arising from an international conference, held in Maratea (Italy), June 26-28, 1991. It comprises six sections encompassing a range of the major aspects of entropy-based developments in water resources. Each section normally starts with an invited, state-of-the-art paper, followed by contributed papers. Section 1 presents a discussion on the perspectives of entropy and energy dissipation. The applications of entropy in hydrology are considered in Section 2, water resources in Section 3, and hydraulics in Section 4. Sections 5 and 6 deal with the applications of energy principles in, respectively, hydrology and hydraulics. This book will interest researchers as well as those engaged in civil engineering, agricultural engineering, environmental engineering, hydrology, water resources, earth resources, forestry, geography and climatology. Graduate students, as well as those wishing to conduct research on entropy or its applications, will find this book to be of particular significance.