Flooding is 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, not all floods are 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.
FEMA Flood Info