Floods are one of the most common hazards in the United States. Flood
effects can be local, impacting a neighborhood or community, or very
large, affecting entire river basins and multiple states.
However, all floods are not alike. Some floods develop slowly,
sometimes over a period of days. But flash floods can develop quickly,
sometimes in just a few minutes and without any visible signs of rain.
Flash floods often have a dangerous wall of roaring water that carries
rocks, mud, and other debris and can sweep away most things in its path.
Overland flooding occurs outside a defined river or stream, such as when
a levee is breached, but still can be destructive. Flooding can also
occur when a dam breaks, producing effects similar to flash floods.
Be aware of flood hazards no matter where you live, but especially if
you live in a low-lying area, near water or downstream from a dam. Even
very small streams, gullies, creeks, culverts, dry streambeds, or
low-lying ground that appear harmless in dry weather can flood. Every
state is at risk from this hazard.
What is the flood risk where I
live?
How can I protect myself from a flood?
