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CLASSIFICATION OF FLOODS

Flood is a consequence of migration of the boundary between land and water bodies, reflecting the normal interaction of the atmosphere, hydrosphere and lithosphere. Two major factors are responsible for flood generation and impart specific features to it. The first is the physical process, which generates the change of position between the lithosphere, atmosphere and hydrosphere. Secondly, the flooded area, depth of inundation, and its duration, depend on the geographic situation in the region where the flood takes place. Due to the great variety in operation of the natural processes and the endless variation in the condition of the geographic arena where they act, many different kinds and scales of floods can be distinguished. There are at least 18 major kinds of floods of natural origin. Growing human influence is becoming evident from the increasing frequency of floods of anthropogenic origin.