This book contains papers presented at the Third International Conference on Debris Flow including all aspects of Debris Flow Monitoring, Modelling, Hazard Assessment, Mitigation Measures, Extreme Events, Erosion, Slope Instability and Sediment Transport, held in Milan, Italy, in May 2010. The Conference was jointly organized by the State University of Milan and the Wessex Institute of Technology, UK, with the co-sponsorship of EurAgEng (European Society of Agricultural Engineers) and CIGR (International Commission of Agricultural Engineering) and the support of the Lombardy Region, Italy. It is the third in a series of conferences on debris and hyper-concentrated flows, among the most destructive of all water-related disasters. Debris flows have attracted more and more attention from the scientific and professional communities in recent years due to their increasing frequency and public concern about associated death tolls. This volume is a valuable tool, containing as it does information on the state of the art in the field of dense and hyperconcentrated flows, especially improved models, and risk assessment techniques that can be used to develop hazard maps to design prevention and mitigation measures. The book will interest engineers, scientists and managers in government, academia and industry involved with hazard prediction, migigation and prevention.