With fresh water becoming an increasingly precious commodity, and the prospect of becoming a source of the same type of political instability that is now associated with energy shortages, sustainable use of water resources is becoming more and more important. One of those uses is for irrigation. Sustainable Irrigation Management, Technologies and Policies IV addresses various aspects of irrigation. It includes not only the scientific and technical aspects of the management of water resources, but also matters the economics and policy aspects. Containing papers presented at the Fourth International Conference on the subject, the book covers the topics such as: The State of the Art; Irrigation Modelling; Irrigation Systems and Planning; Sustainable Irrigation and Water Re-use; Irrigation Management; Governance for Sustainable Irrigation; Water Trade Issues.