More than a hundred people died because of devastating flash floods in Texas earlier this month. It’s important to understand how floods happen, and what we can do to keep ourselves safe. Ali Velshi speaks with Jim Blackburn,

The risk of the catastrophic flooding that struck Texas Hill Country as people slept on July 4 and left at least 120 dead was potentially underestimated by federal authorities, according to an ABC News analysis of Federal Emergency Management Agency data, satellite imagery and risk modeling.

The camp where 27 girls died successfully challenged initial risk designations by US regulators, according to reports.