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| Floods and Drainage Congestion |
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Historical Flood Extents from 1954 to 2001 in
Bangladesh BWDB has calculated the flooded area of Bangladesh every year from 1954 and until today. For an area to be included in the flooded area it needs only to be flooded at one incidence during the considered monsoon season, i.e. the areas contributing to the flooded area was not necessarily flooded at the same time. There were e.g. six separate floods within the 1987 rainy season and three in 1988. The flooded area calculated by BWDB is mostly related to some kind of damage, it may be damage to crops, houses, escape of fish stocks etc. BWDB divide flood into severe, moderate and normal flood, where normal means no damage. If a Thana is severely flooded then BWDB assumes as a thumbs rule that 35-40% of the Thana is flooded, but the percentage is increased as water level increases based on human judgment. During the stressing 1988- and 1998-flood the percentage was increased considerably as water levels were far above danger level. Approximately 18% of Bangladesh’s is river, lake or other water bodies and this area is in general not included in the given flood area. As should be clear from the above explanation the informed flood area by BWDB is not a very precise number. Presently FFWC is working on producing flood maps on the basis of satellite pictures. It will enable the centre to give consistent, precise and instantaneously information on flooded area.
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