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. 2010 May 24;107(25):11155–11162. doi: 10.1073/pnas.1004812107

Fig. 3.

Fig. 3.

A potential water-production (supply) scenario in a watershed or region. As demand increases, incremental supply projects (new dams, reservoirs, pumping) increase water availability. Once the maximum cost-effective extraction of surface and groundwater is reached, there is a final shift to a higher cost backstop supply of water such as desalination or water transfers.