Presenting the state-of-the-science at the start of the 21st century, an outstanding overview of current research and progress: Precipitation; Snow and ice; Large area experiments; Evapotranspiration; Radar applications; Microwave soil moisture; GIS; General hydrology; Wetlands; and Hydrological modelling. Details of operational applications as well as attempts to exploit a more varied portion of the electromagnetic spectrum are included. 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