"There is more than enough water in the world for domestic purposes, for agriculture and for industry. (...) In short, scarcity is manufactured through political processes and institutions (...). " (United Nations Human Development Report 2006: 3) Water scarcity, water crisis, water wars - since the beginning of the 1990s these terms have appeared again and again in scientific debates, political strategies, and media reports. Water is perceived as a scarce resource that needs efficient management in order to satisfy all needs and to prevent violent conflicts over its distribution....