I think if I lived anywhere that required irrigation to keep a lawn growing then I just wouldn't have a lawn. It seems hugely wasteful to use all that water just to keep a lawn growing that would otherwise die.

Though I am of course a complete hypocrite when it comes to sustain-ability, I am happy to keep 3 PCs running 24/7 and I drive a performance car that only does about 22mpg.
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Remind me to change my signature to something more interesting someday