Floodwaters be contaminated with debris as well as high levels of bacteria, chemicals, waste and other pollutants, which can cause prolonged health risks, experts say.

Slow-moving storms will bring a risk of flash flooding to Texas both Saturday and Sunday. Here's where the greatest risk will be.

Catastrophic flooding struck central Texas on Friday as the Guadalupe River surged by more than 20 to 26 feet within 90 minutes, causing widespread devastation and forcing mass evacuations in Texas Hill Country. At least 80 people have been killed in the floods while others remain missing or displaced and more than 850 people required rescuing.

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.

A surge of deep tropical moisture returns to Texas this weekend. Here's where the risk of flash flooding is highest in the state this weekend.

Texas has identified more than $50 billion in flood control needs, but lawmakers have devoted just $1.4 billion to address them

The July Fourth flood moved so quickly in the middle of the night that it caught many off guard in a county that lacked a warning system.

Kerr County failed to secure a warning system, even as local officials remained aware of the risks and as billions of dollars were available for similar projects.