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Introduction
The river jamuna enters in bangladesh at nageshwari upazila of Kurigram district in the name of Brahmaputra. The average width of the of the river within bangladesh is 11.8 km. Bangladesh is a land of many rivers, and heavy monsoon rains. Therefore, the country is subject to inundation by overflow from the riverbanks due to d r a i n a g e cong e s t i o n ,rain fall run-off, and storm-tidal surges. Some 30to 35 per cent of the total land surface is flooded every year during the wet monsoon . These normal floods are considered a blessing for Bangladesh-providing vital moisture and fertility to the soil through the alluvial silt deposition. Only abnormal floods are considered disastrous, i.e., the high-magnitude events that inundate large areas, and cause widespread damage to crops and properties. During the peak flow season (July, August and September), most of the rivers overflow their banks, and deposit silt on the flood plains providing vital moisture and fertility to the soil. Thus, the normal floods are considered a blessing for Bangladesh. Only abnormal floods are considered disastrous, i.e., the high-magnitude events that inundate large areas.
Causes of Devastating Floods
· Excessive rainfall in the catchment area
· Synchronization of the peak water levels of all the major rivers of Bangladesh.
· Sometimes solar eclipse retards the outflow of water drainage by raising the tidal level.
· Earthquakes cause tectonic anomaly in the Himalayan region and the Bay of Bengal.
· Infrastructure development without adequate drainage

EXTENT OF BANK-EROSION AND DISPLACEMENT
Rivers constantly alter their course, changing shape and depth, trying to find a balance between the sediment transport capacity of the water and the sediment supply. This process, called riverine erosion or riverbank erosion, is usually seen as the wearing away of riverbanks

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