A flash flood in the Texas Hill Country on the Fourth of July killed dozen of people, including 27 people at an all-girls summer camp along the Guadalupe River.

Zoom in: If kids have not brought the subject up, parents should consider opening the line of communication, Ana Ugueto of Texas Children's Hospital said in a Facebook Live video. It's important to use simple, straightforward language and speak calmly, Ugueto said.

The rivers etching the terrain are a beloved feature of the rapidly growing region. But last week’s flooding was an agonizing reminder of the dangers they pose.