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| The word flood is generallt synonymous with the river flood. Cross-boundary inflow, coincidence of the flood peaks of Ganges, Brahmaputra and Meghna and
huge rainfall is the cause to occure this type of flood. In the middle of the country, a broad strip of land is flooded by bank overflow from the main rivers - Jamuna, Ganges, Padma, and Meghna, and their tributaries and distributaries. Heavy rains also cause flooding, as drainage is impeded by high stages in the main rivers. Normally, 20-25% of the area is inundated during monsoon season along the river. In case of extreme flood events 35-70% of the country are inundated extending the areas far beyond the riverbanks. This type of flood becomes disastrous when the flood peaks of the Ganges, Brahmaputra and Meghna synchronize within a week or so, as was the case during the catastrophic floods of 1988 and 1998 |
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