Flash Flood Awareness Could Save Your Life One Day

ABC News' Matt Gutman reports the latest news on flood safety that could help during stormy conditions.
3:49 | 07/15/15

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Transcript for Flash Flood Awareness Could Save Your Life One Day
Back now at 7:42 with "Gma" survival week and how to survive a flash flood. Raging water can take you by surprise and sweep you away in an instant. ABC's Matt Gutman is here with important information that could just save your life. Good morning, Matt. Good morning, Lara. Ginger just showed those videos. You think how could anybody have survived that? We'll show you a couple swimming techniques that could keep you from drowning and a car like this, how it could help you or harm you. This is the most terrifying thing I've ever seen. They can form almost instantly. Oh, my god. Oh, my god. Reporter: Heavy rains turning into flash floods. Some invading communities with more than twice the power of niagara falls. Oh, my gosh. Oh, my gosh. Reporter: And snatching up anyone in their path. We have two more trapped in high water. Reporter: That's not a river down there. That was once part of a highway. Out of control water claiming the lives of at least 25 Americans already this year including one just this week. Please don't get out. Reporter: That's 70-year-old glen Dotson. His car getting hammered by floodwaters. He makes the dangerous decision to get out and run. Oh, he just fell down. Reporter: Walls of mud and water just came right at me. Reporter: A good samaritan pulling him into another vehicle saving his life. To learn ow to survive a flash flood, I get into one. Or the next closest thing, class three rapids on the new river in West Virginia. The idea is that a river can simulate floodwaters. Absolutely. Reporter: My survival instructor Whitewater rescue ranger Kathy zerkel. Her first lesson. Stay out of the water. Reporter: That doesn't look fast but I nearly got swept away. In the shallows we practice two methods of swimming that could save your life. First aggressive. Going as hard as you can for the shore or target you think you can reach. Something like an eddy, a space behind a car, rock or building where the water is calm and then defensive swimming feet up floating on your back when you need to rest but now I'm on my own. Without an inflated life vest. About to get real. I try aggressive swimming. Close to the eddy. Reporter: I do it a couple of times. I never realized how hard it is to swim fully clothed clinging to floating debris like this cooler may be the rest you need but to simulate the most dangerous floods we head to Whitewater. So we have camera here, camera here, gopros on and kayakers, rescuers and a camera 900 feet up on that bridge. This time it's all about defensive swimming. Keeping my feet up so I don't get dragged under. The goal, just making it out. It was like being in a giant industrial sized washing machine. Every year it happens. 12 inches of water could start your car moving down the street. But if the water is lower than that, stay in it. If it starts to rise you see water filling your car, get out. Unbuckle your seat belt, roll down the window. What you want to do is climb up on top of the roof like this. This way will be much more visible to rescuers that can come get you. If the car starts moving. Get off and try to swim to safety. Ma Matt, go take a nap. I know I need one after watching that. Yep. I mean, you are a brave man. Matt Gutman, thank you so much.

This transcript has been automatically generated and may not be 100% accurate.

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