The Causes of Flooding in Bangladesh
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The Causes of Flooding in Bangladesh. Name:. Bangladesh has a high population density due to people centring around fertile farm land clustering in the two major urban areas of Dhaka and Chitttagong.

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The Causes of Flooding in Bangladesh

Name:

  • Bangladesh has a high population density due to

  • people centring around fertile farm land

  • clustering in the two major urban areas of Dhaka and Chitttagong

Background: Bangladesh is a low lying country situated on the delta of the rivers Ganges and Brahmaputra. The country suffered from regular flooding caused by over flowing rivers or by tidal flooding.

  • Causes of Fluvial Flooding:

  • Monsoon climate creates high levels of rainfall which swell the rivers. Rainfall up to 2600mm in about 5 months.

  • Bangladesh is the natural flood plain for the 2 rivers to flood

  • Increased runoff from the Himalayas due to partial deforestation in the surrounding countries. Deforestation causes less interception so water can enter the system quicker.

  • The land is only 1 to 6 metres above sea level so water is slow to runoff the area.

  • The flat flood plain enables the water to easily spread over large areas.

  • Spring high tides can also prevent water from escaping from the flood plain.

  • Causes of tidal flooding

  • As most of the country is 1 to 6 metres above sea level it is at risk of tidal surges.

  • The strong cyclones in the area surge water up the Bay of Bengal.

Example of Tidal Surge Flooding

  • Summary of why Bangladesh is at Risk

  • Low lying land at less then 6 metres above sea flood.

  • Large floodplains enable flood waters to spread out and cover large areas of land quickly.

  • Strong tidal surges can easily be higher than the land.

  • Siltation in the rivers decreases their capacity to transport flood water.


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