Physical causes of flooding in LEDW

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3 major rivers flow through Bangladesh. The Meghna, Brahmaputra & Ganges
This effectively makes Bangladesh one big delta.
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70% of Bangladesh is only 1m above sea level
therefore any heavy rainfall which is common in Bangladesh combined with high tide in the Bay of Bengal will lead to saturated land and a more likely outcome of flooding as flows such as groundwater flow will be cut off.
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The Climate
From June – October 30% of the land mass will be flooded by the excess discharge created by Monsoon rains (1000mm).
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River Sedimentation
Snowmelt/rainfall washes weathered material from the Himalayas into the river system which fills the river channels with sediment reducing the discharge that they can carry hence reducing the volume of water needed for a flood to occur.
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Cyclones
common in Bangladesh which can cause storm surges. This causes water to flow over the land and when the cyclone storm surge meets the 3 major river flooding over the land is increased in likelihood because two sections of water are hitting each other
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Other cards in this set

Card 2

Front

therefore any heavy rainfall which is common in Bangladesh combined with high tide in the Bay of Bengal will lead to saturated land and a more likely outcome of flooding as flows such as groundwater flow will be cut off.

Back

70% of Bangladesh is only 1m above sea level

Card 3

Front

From June – October 30% of the land mass will be flooded by the excess discharge created by Monsoon rains (1000mm).

Back

Preview of the back of card 3

Card 4

Front

Snowmelt/rainfall washes weathered material from the Himalayas into the river system which fills the river channels with sediment reducing the discharge that they can carry hence reducing the volume of water needed for a flood to occur.

Back

Preview of the back of card 4

Card 5

Front

common in Bangladesh which can cause storm surges. This causes water to flow over the land and when the cyclone storm surge meets the 3 major river flooding over the land is increased in likelihood because two sections of water are hitting each other

Back

Preview of the back of card 5

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