A comprehensive, integrated system of 50 models was developed to evaluate policies that include mixes of building new facilities and changing operating rules to improve water supply, as well as adjusting prices and regulations to reduce demands. Analysis performed with the system resulted in a new national water management policy, saving hundreds of millions of dollars in investment expenditures and reducing agricultural damage by about $15 million per year, while decreasing thermal and algae pollution. The methodology was adopted by the Dutch government and has been used to train water resource planners from many nations.

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