As you watch the flood in progress, you can watch cars float away one-by-one. I hope that this gives you pause before you yourself consider driving across a flooded roadway. The topic here is how much running water does it take to make a SUV (sport utility vehicle) or pick-up truck to float away. Water weights 62.4 pounds per cubic foot. Given typical velocities of water running across sloped roadways, for each foot the water rises, about 500 pounds of lateral force is applied and the a typical vehicle volume displaces about 1500 pounds of water. This means that the car weights 1500 pounds less for each foot the water rises. A typical pickup truck weighs about 5000 pounds, while a Suburban weights about 5500 pounds. A car like a Civic weighs about 3000 pounds. QUESTION: what is the height of water needed to float a Civic (divide the weight by 1500)