"In Marble Falls, a city 40 miles northwest of Austin that recorded 18 inches rain in six hours..." according to one report.
30-day rainfall accums here in the Dust Bowl region are silly high. Still need some of your mountains here, though. For the most part, we're gradient-challenged. We'll take some of your snow, too, so we can have some kind of dependable run-off. So we're left to hunt down spillways and stuff, like this ('scuse the low-res; it's clipped from a video).