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Having made an article on windcatchers, I couldn't resist writing a little article on
which are irrigation systems that can be used in conjunction with windcatchers to keep buildings cool in the desert without using any electrical power! I wrote about these in my 31 August 2008 diary entry.
I did not copy all the information from this diary entry to the Qanat article, in part because certain links triggered a spam alert on the part of the Azimuth Wiki. Annoying!