A retired nurse, her son, and a family friend say they were lucky to survive last week's flash floods in Texas that killed more than 100 people, including many summer campers.

The devastating floods that struck central Texas over the Fourth of July weekend have become one of the deadliest flood events in the U.S. in the past century, Newsweek previously reported. By Sunday evening, authorities had confirmed at least 82 fatalities.

Over just two hours, the Guadalupe River at Comfort, Texas, rose from hip-height to three stories tall, sending water weighing as much as the Empire State building downstream roughly every minute it remained at its crest. The force of floodwater is often more powerful and surprising than people imagine.

Deadly flooding has devastated large swaths of Texas across the Hill Country and Central Texas. The Guadalupe River flooded on Friday, July 4, impacting cities across Kerr County including Kerrville,

On Water Street in the City of Kerrville, a memorial wall dedicated to the lives lost in last Friday’s devastating flood is growing.

Key questions remain unanswered about the actions Texas officials took both before and during the catastrophic July Fourth holiday floods remain unanswered.