A washed-out Guadalupe River appeared stuck in time nearly two weeks after the catastrophe. Large trees laid on their sides, and debris lingered throughout what was left.

Flooding expert says modeling and monitoring can be the backbone of a system that includes training and in-person warnings to save lives and property.

A washed-out Guadalupe River appeared stuck in time nearly two weeks after the catastrophe. Large trees laid on their sides and remnants of debris lingered throughout what was left. Some residents of the area say it's unlike anything they've seen in the river before.