For those interested in a dramatically different vision of how things COULD be, and are becoming in some areas of the US, here is a short video of Brad Lancaster, of Tuscon, who is probably the foremost expert on rainwater harvesting. I happened to work with him last week on a project here in LA, and he is a fascinating visionary:
Free Water, A Short Video
http://www.youtube.com/watch?v=4aQrZtG-LVg