Perth’s plunge into desalination comes at a critical time, when water is emerging as the world’s next major natural-resources challenge. Water use, like oil, is surging as economic growth takes off in China, India and elsewhere. According to the International Water Management Institute in Sri Lanka, about a fifth of the world’s population, or more than 1.2 billion people, already lives in areas with insufficient supply. Due to changing rainfall patterns linked to climate change, many places — including parts of Australia, the American Southwest, India and Western Europe — are getting as much as 10% less rain than they used to. There’s also a global push to expand agriculture, the world’s biggest guzzler of water, to meet growing food and alternative energy demand.
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Source: http://online.wsj.com/public/article/SB12051823472
Population pressure and increasing water competition in a changing climate require us to take stock of the availability and use of water across scales. Water availability not only influences farmers’ commercial prospects but also irrigation-related enterprises and agri-businesses. Greater water scarcity could jeopardize irrigation and agricultural markets while excessive water use can lead to declining ecosystems, water quality and soil health. IWMI advises development partners and the public and private sectors on all aspects of water resource availability and use through a variety of advanced modeling and remote-sensing products and tools, including 
The ability of farmers to engage in or expand irrigation depends on the prevailing socioeconomic, ecological and political contexts, which are often complex, non-linear and changeable. Overcoming systemic barriers to farmer-led irrigation development while taking advantage of existing opportunities 
A lack of affordable credit, particularly for women and resource-poor farmers, is one of the main barriers to expanding farmer-led irrigation in low- and middle-income countries. But 
Scaling farmer-led irrigation requires strengthening human capacity and knowledge exchange among all actors and stakeholders involved. IWMI takes an action research approach, working with national and international research institutions, governments, extension agents and public and private organizations to co-develop the scaling ecosystem and strengthen capacity to drive scaling networks and collective action. We support the