Flash floods are no joke, proven by this video of a Jeep floating away in Texas.
This Jeep owner was lucky to only loose his Jeep and not his life.
Flash floods will kill you. If you are driving and see a flooded road never drive through it. Turn around and stay alive.
Every year people knowing drive through flooded roads and low water crossings. They do not realize that even a few inches of rushing water has massive power. It can and will sweep your vehicle off the road and downstream. Don't let this happen to you.
Whether you are camping in a lowland area or driving through the town, always watch for flash floods. The speed at which they move might leave you no escape.