YSK: Even slow-moving water presents incredible risk. Trying to move across a fast-moving stream or flood water is suicide. A 1-meter cube of water is the definition of a ton. Imagine the water as 1 ton cubes moving at that speed, and you will see how cars get swept away trying to cross.
from /r/YouShouldKnow
YSK：即使是緩慢流動的水也會帶來難以置信的風險。試圖穿越快速流動的溪流或洪水就是自殺。1米長的水立方是一噸的定義。想象一下，水是1噸的立方體，以這種速度移動，你就會知道汽車是如何被沖走的。