A new framework for water resources management based on the principle of integrated watershed management, described as "a form of coordinated management of land and water resources within a region, with the objectives of preventing land degradation, protecting the quality of the freshwater resource, protecting biodiversity, and continuing sustainable use, within a context that includes genuine community/government partnerships and recognition of socio-economic objectives" is emerging, as this volume illustrates. The International Association of Hydrological Sciences is the world's premier member-based organization promoting the study and practice of Hydrology. Our books are authored, edited and produced at the highest level of quality, with the most current and thorough research. Our publications and our work advance the science and the professional practice of Hydrology in a variety of Science and Engineering fields around the world. The areas that we publish in include: • Ground water • Surface water • Snow and ice hydrology • Drought and desertification • Runoff modelling • Watershed • Remote sensing • Water quality • Water resources and management • Ecohydrology/hydro-ecology • Erosion and sediment • Tracer hydrology