Some flooding events are massive, covering with water hundreds of thousands of acres along the entire floodplain of a river system. These floods tend to rise slowly and may have high water for weeks or even months. History has shown that many levees fail during regional long-term flooding events, because most levees are designed to hold back high water for only a short time. The longer the water remains high, the more the water pressure acts on the levee, slowly forcing the water into the pores, letting the water seep into and under it. This often causes levee failure and explains why so many levees fail in long-term regional floods. Long-term flooding events can affect hundreds of thousands or millions of people, and cause widespread disease, famine, loss of jobs, and displacement of populations as a result of the disaster. Floods of this magnitude are among the costliest of all natural disasters.
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Disasters: Why No ones Really 100 Safe. This is common knowledgethat disaster is everywhere. Its in the streets, its inside your campuses, and it can even be found inside your home. The question is not whether we are safe because no one is really THAT secure anymore but whether we can do something to lessen the odds of ever becoming a victim.