Sustainable water management is one of the greatest twenty-first-century challenges; supply shortage is cited as one of the gravest risks facing society (World Economic Forum, 2013). Some 1.6 billion people live in regions experiencing severe water stress; by 2050 this is projected to increase to 3.9 billion people (OECD, 2012). Water scarcity has been defined as the point at which the aggregate impact of all users impinges on the supply or quality of water under prevailing institutional arrangements to the extent that the demand by all sectors, including the environment, cannot be satisfied fully. (UN Water, 2006: 4) Hence scarcity is a consequence of demand, supply and governance.
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