Flash floods in Texas have killed nearly 90 people, many of them children. Heavy rains fell quickly in the predawn hours Friday in the Texas Hill Country, causing the Guadalupe River to rise 26 feet in just 45 minutes.

Flash floods happen when heavy rains unleash more water than the ground can absorb, causing that water to pile up and flow to low-lying areas

Camp Mystic, according to the Texas Tribune, has hosted the daughters of former governors, a president, and other politicians through summers. Rep. August Pfluger of Texas revealed his daughters were staying at the camp and had been evacuated and reunited with their family following the deadly flooding.