This book focuses on and discusses the results of research done on the risk assessment levels associated with relevant regional variables in the Aral Basin (the research outcome of the EU-INCO FP6 research project Jayhun: Interstate Water Resource Risk Management: Towards a Sustainable Future for the Aral Basin). A strategy for an improved management of the region's water resources is developed The book provides current and reliable information on: [the rate of glacial retreat in the Amu Darya Basin and the implications for future water resources in the region. [the impact and assessment of global changes on annual precipitation. [the establishment of rates of reservoir siltation by hydrographic surveys, [the analyses of wastage and effectiveness of water usage in the large irrigation massifs Water resources models are used to analyse existing and newly generated data and these are calibrated with existing data and subsequently used for simulating various possi