Lots of information on the history and current water supply problems of the Colorado river supply system are avialable here at;

http://www.livingrivers.org/pdfs/lasvegassunfeature2008.pdf

http://www.bbc.co.uk/iplayer/episode/b00...merican_Plenty/



The long term future for the water supply from the Colorado river system seems to be pretty bleak with demand outstripping what the water supply from the eastern side of the rocky mountains can supply. The alternatives appear not to be sustainable either. You may of heard of peak oil but in this part of the world peak water may get you first. You can live without oil because there are alternatives, but you can't live without water.