A flood is a phenomenon concerning the flooding in a short time (from hours to days) of a well-defined and commonly subaerial, by a body of water.
This may be a natural phenomenon as the overflowing of rivers, from their usual bed or basin, in a violent and devastating flooding or for combined action of high tide and typhoons in coastal areas, the arrival of a tsunami on of a coast, or even sudden melting of glaciers and snowfields of natural causes (typical of those by subglacial volcanic eruptions in Iceland). When the flood is caused by overflowing rivers swollen by rain is also talk of high flood, which may also be related erosion and change in morphology of areas involved in the phenomenon.
Read More: http://hubpages.com/hub/What-is-Flood
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