The time that I lived in Austin we would go through 2-3 years of drought then have a month or two of floods then back to 2-3 years of drought. I have seen the Highland Lakes (Lake Buchanan, Inks Lake, Lake LBJ and Lake Marble Falls which are upstream of Lake Travis, Lake Austin and Town Lake) get very low and the Pedernales, Blanco, Frio, Guadalupe and Comal rivers almost dry. If Central Texas keeps growing they are going to modify the LCRA agreements with the rice farmers downstream, the aquifers can get low as well and are not recharging at the rate they are being depleted.