From CNN: Children’s camps in Texas were located in areas known to be at high risk of flooding

“The waterways in Texas Hill Country have carved paths over the centuries through the granite and limestone, shaping the rocky peaks and valleys that make the region so breathtaking.

When too much rain falls for the ground to absorb, it runs downhill, pulled by gravity into streams, creeks and rivers. The rain fills the waterways beyond their banks, and the excess overflows in predictable patterns that follow the terrain.

Governments and waterway managers know what will flood first and who will be threatened when a truly historic rain event takes place.”