two feet of rushing water to move even the biggest suvs and pickups. just six inches can knock you off your feet. >> most everybody's been in the ocean and they've been pounded by a huge wave and they feel that force and they can't get up until the water recedes and a moving water, river or stream or flood control channel, does not give you that relief. it never releases, so that force is constantly on you and you can't get up. that's where most of your drownings occur. >> you are trapped in your car and being carried away in a flash flood. what should be your first move? a, unbuckle your seat belt and open the windows. b, push open the door and swim away from the car or c, keep the windows rolled up and stay with the car. >> you're not going to be able to push the door open against the weight of that water. remember how heavy that water is, remember it's an incompressible fluid. it doesn't just push aside like you do the air when you open the door. so that door will pretty much be staying closed. >> which makes b an impossible decision and staying with the