History and Results of the Hydrological Co-operation of the Countries Sharing the Danube Catchment (1971-2008) -- The Danube River and its Basin Physical Characteristics, Water Regime and Water Balance -- Palaeogeography of the Danube and Its Catchment -- Danube River Basin Coding -- Characterization of the Runoff Regime and Its Stability in the Danube Catchment -- Coincidence of Flood Flow of the Danube River and Its Tributaries -- Basin-Wide Water Balance in the Danube River Basin -- Thermal and Ice Regimes of the Danube River and Its Tributaries -- Sediment Regime of the River Danube (1956-1985) -- Training of the Danube River Channel -- The Fords of the Danube -- Forecast Uncertainties in the Operational Flood Forecasting of the Bavarian Danube Catchment -- Sarib. The Danube River Basin is shared by 19 countries and there is no river basin in the world shared by so many nations. Covering an area of about 800,000 km², it is Europe's second largest river basin and home to 83 million people of different cultures, languages and historical backgrounds. Management of common water sources and overcoming difficulties caused by droughts and floods requires co-operation between these countries. In 1971 these common interests motivated the hydrologists of (at that time) eight Danube countries to start regional co- operation in the framework of the International Hydrological Decade of UNESCO. Since 1975 co-operation has been under the umbrella of the International Hydrological Programme (IHP) of UNESCO. This volume brings together the reports and papers related to regional co-operation. It is the result of a major collaboration and examines a broad range of topics. These include hydrological forecasting, real-time informational forecasting systems, models for rainfall-runoff processes, hydro-meteorological extremes, meteorological data and hydrological modeling, long-term statistical methods, examples of extreme flood and drought events, global climate change and hydrological processes, ecological aspects of hydrological changes, water management, water framework directive and integrated water quality processes, morphological processes, monitoring of watershed and river bed, models of erosion and sediment transport, and developments in hydrology. The book includes the efforts of many hydrologists and technical staff from different Universities and Agencies from all countries of the Danube River Basin. Key themes: the Danube River Basin - hydrology - forecast - water resources - water management - water measurement Mitja Brilly is Professor of Hydrology and Management of Water Regime at the University of Ljubljana, Slovenia, head of the Chair of Hydrology and Hydraulic Engineering, member of the Faculty of Civil and Geodetic Engineering Senate, head of University Post-graduate Study Programme in Environmental Protection, chairman of the Slovenian National Committee for the International Hydrological Programme (IHP) of UNESCO. He was responsible for organization of several international conferences such as Regionalization in Hydrology 1990, FRIEND 97 and XXIVth Conference of the Danubian Countries 2008. He has conducted more than 70 investigations in hydrology, hydraulic engineering and environment, and has more than 40 publications.