Because it’s never flooded in Texas before.
Of course folks building in flood plains, even though the houses are on stilts, or in low-lying areas with poor drainage never thought there would be a problem. A 100-year flood? A 500-year flood? No problem, still have a bunch of years before it happens. That's not the way it works, folks. Though the probability may be low, it's there and it's the same each year. No need to wait for 100 or 500 years. BTW, this state state climatologist must be a buddy of Bill Nye, the [no]science guy who blames it all on "global warming."
LOL, I guess our climatologist never heard of the Austin flood of 1981. We were camping on the shore of Lake Travis that weekend... it got pretty scary.
If the climate hadn't changed since the ice age, it might have been snow rather than rain.
Prior to the evil capitalists arrival on the scene, the weather was always pleasant and predictable.