Arizona uses dams, irrigation systems, pumps, and canals to control and move its limited water supply. Nearly a dozen dams control runoff from the Mogollon Rim, providing flood control and stored water. The Salt River Project, completed in 1911, brought water to farms near Phoenix. Later, the Central Arizona Project carried Colorado River water to the Phoenix and Tucson areas. Water remains a major challenge because groundwater has been depleted around Phoenix and Tucson, and cities have had to buy water rights from distant areas.
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