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A Hydrological Disaster is a violent, sudden and destructive change either in quality of earth's water or in distribution or movement of water on land below the surface or in atmosphere.

A flood is an overflow of water that submerges land. The EU Floods Directive defines a flood as a temporary covering by water of land which is usually not covered by water. Flooding may result from the volume of water within a body of water, such as a river or lake, which overflows causing the result that some of the water escapes its usual boundaries.