Backgrounder: Floods And Flash Floods
From the Federal Emergency Management Agency (FEMA) - October 23, 2004
EMERGENCY INFORMATION
- Flood waters can be extremely dangerous. The force of six inches of
swiftly moving water can knock people off their feet. The best protection
during a flood is to leave the area and go to shelter on higher ground.
- Flash flood waters move at very fast speeds and can roll boulders,
tear out trees, destroy buildings, and obliterate bridges. Walls of
water can reach heights of 10 to 20 feet and generally are accompanied
by a deadly cargo of debris. The best response to any signs of flash
flooding is to move immediately and quickly to higher ground.
- Cars can be easily be swept away in just 2 feet of moving water. If
flood waters rise around a car, it should be abandoned. Passengers should
climb to higher ground.
DANGER ZONES
Floods and flash floods occur within all 50 states. Communities particularly
at risk are those located in low-lying areas, near water, or downstream
from a dam.
WHAT IS A FLOOD?
Floods are the most common and widespread of all natural disasters--except
fire. Most communities in the United States can experience some kind of
flooding after spring rains, heavy thunderstorms, or winter snow thaws.
Floods can be slow, or fast rising but generally develop over a period
of days.
Dam failures are potentially the worst flood events. A dam failure is
usually the result of neglect, poor design, or structural damage caused
by a major event such as an earthquake. When a dam fails, a gigantic quantity
of water is suddenly let loose downstream, destroying anything in its
path.
WHAT IS A FLASH FLOOD?
Flash floods usually result from intense storms dropping large amounts
of rain within a brief period. Flash floods occur with little or no warning
and can reach full peak in only a few minutes.
HELP YOUR COMMUNITY GET READY
The media can raise awareness about floods and flash floods by providing
important information to the community. Here are some suggestions:
- Publish a special section in your local newspaper with emergency information
on floods and flash floods. Localize the information by printing the
phone numbers of local emergency services offices, the American Red
Cross, and hospitals.
- Interview local officials about land use management and building codes
in floodplains.
- Work with local emergency services and American Red Cross officials
to prepare special reports for people with mobility impairments on what
to do if an evacuation is ordered.
- Periodically inform your community of local public warning systems.
DID YOU KNOW...
- Individuals and business owners can protect themselves from flood
losses by purchasing flood insurance through National Flood Insurance
Program. Homeowner's policies do not cover flood damage. Information
is available through local insurance agents and emergency management
offices.
- Flooding has caused the deaths of more than 10,000 people since 1900.
Property damage from flooding now totals over $1 billion each year in
the United States.
- More than 2,200 lives were lost as a result of the Johnstown, Pennsylvannia
flood of 1889. This flood was caused by an upstream dam failure.
- Nearly 9 of every 10 presidential disaster declarations result from natural phenomena in which flooding was a major component.
- On July 31, 1976, the Big Thompson River near Denver overflowed after
an extremely heavy storm. A wall of water 19 feet high roared down the
Big Thompson Canyon where many people were camping. 140 people perished
and millions of dollars of property were lost.
The information provided on this site is for informational purposes only.
Always consult your doctor for medical advice.
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