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Arizona's solar-over-canal project will tackle its major drought issue
(interestingengineering.com)
This is a most excellent place for technology news and articles.
There probably are, but Saudi Arabia owns a bunch of land in Arizona and decided it was the perfect place to grow alfalfa, a very water intensive crop. That said, some farming does make some sense even in the desert, since it is almost certainly cheaper to have local produce than to need to import everything from places that have an abundance of water, even if that means building canals to water them.