Flash floods usually occur in low-lying areas where water can ... move immediately to higher ground. Do not wait for instructions to move. Do not walk through moving water. Six inches of moving ...

But what exactly does that mean? A "100-year flood" isn ... It doesn't mean you're witnessing a flood that will occur only once every century, writes the U.S. Geological Survey.

A minor flood happens with the river’s stage reaches 23′. At 25′, moderate flooding occurs. A major flood is going on when the flood stage reaches 28′. At 51′, the flooding is massive ...

IN EXTREME SITUATIONS, FLOODING CAN OCCUR. NOW, A FLASH FLOOD WARNING MEANS FLOODING IS HAPPENING. NOW YOU WANT TO MOVE TO HIGHER GROUND IMMEDIATELY. DO NOT WAIT FOR INSTRUCTIONS. DO NOT WALK ...