Ironically if Austin and other LCRA customers used as little water as San Antonio, there'd probably be plenty of water to go around. There was even a recent article in the Austin paper saying Austin should learn from San Antonio:
http://www.statesman.com/opinion/con...lips_edit.html
LCRA is flushing hundreds of thousands of acre feet down the Colorado so some rice farmers WAY downstream can keep their crops flooded and to generate hydroelectric power. Those are uses that are incompatible with the demands of this area and represent why the Highland Lakes are in such decline during this drought.