This webpage offers information on flood awareness within the United States. Topics include preparation before a flood, assistance during a flood, and what to do after a flood. From the webpage: "Floods are one of the most common hazards in the United States, however not all floods are alike. Some floods develop slowly, while others such a flash floods, can develop in just a few minutes and without visible signs of rain. Additionally, floods can be local, impacting a neighborhood or community, or very large, affecting entire river basins and multiple states."
Federal Emergency Management Agency Ready.gov: http://www.ready.gov/