Hazards: Floods and Flash Floods

Floods are the most common and widespread of all natural disasters. Most communities in the United States can experience some degree of flooding after spring rains, heavy thunderstorms or winter snow thaws.

Most floods develop slowly over a period of days. Flash floods, however, are like walls of water that develop in a matter of minutes. Flash floods can be caused by intense storms or dam failure.

Hazards: Floods and Flash Floods

Other Hazards

Planning Considerations

Consider the following when preparing for floods:

Permanent floodproofing measures are taken before a flood occurs and require no human intervention when flood waters rise. They include:

Contingent floodproofing measures are also taken before a flood but require some additional action when flooding occurs. These measures include:

Emergency floodproofing measures are generally less expensive than those listed above, though they require substantial advance warning and do not satisfy the minimum requirements for watertight floodproofing as set forth by the National Flood Insurance Program (NFIP). They include:

Last Modified: Tuesday, 21-Mar-2006 08:36:50 EST