[bobbo666]

Would have done no good. The weather alert for the area was at about 4A — and that was applicable to most of central Texas. 20 minutes later the weather folks realized that tons of rain was going to hit that specific area — much too late to wake and evacuate anyone.
Hills and poor predictive technology combine to put this into the same risk category as an earthquake — you know there is an earthquake when it happens. Ditto on flash floods.
The only real “protection” is to limit such camps to large lake shores — where a flash flood dissipates.

[TangoLimaSierra]

Would have done no good. The weather alert for the area was at about 4A

There were earlier alerts that sould have gotten them moving in time. Listen to this:

A meteorologist talks about the floods.

[NorthMountain]

Here is a 37 minute video, uninterrupted take, of the flash flood going from a trickle to a raging "ocean".