US DEPT OF THE INTERIOR / SCIENCE PHOTO LIBRARY US DEPT OF THE INTERIOR / SCIENCE PHOTO LIBRARY
Bringing water to the desert: aerial view of the canal of the Central Arizona Project (CAP). The CAP takes water from Lake Havasu on the Arizona - California border across 536 kilometers of desert to feed communities throughout central Arizona. The project started in 1973, and is due for completion in late 1992. At full capacity, the canals and tunnels of the system will carry about 2000 billion litres of water per year. This is needed to prevent the over-extraction of underground water in the state; Arizona currently extracts far more than can be replenished by natural means. Photographed near Phoenix, Arizona.
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