In the early hours on Friday (July 4), a large storm dropped about a foot of water in just a few hours over the Texas Hill Country. In 45 minutes, the water ran down the region's slopes into the Guadalupe River, which rose by more than 26 feet (8 meters) and burst its banks. In Kerr County, the deluge of water swept away people, homes and infrastructure and, as of July 8, more than 100 people have died.
So what caused such catastrophic flooding?
