"Even in the best of times, water in Texas has always been an ornery and mercurial resource. It falls from the sky in torrents in the sodden eastern counties along the Gulf of Mexico and falls sometimes not at all in the parched counties to the west where, in a good year, a foot or less of rain might make it to the ground."
https://www.climateliabilitynews.org/2018/07/26/water-crisis-texas/