Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
39 Cards in this Set
- Front
- Back
|
What percentage of the area is delta land? |
80% |
|
|
How far above sea level is most of the region? |
1m |
|
|
What two rivers meet? |
Ganges Brahmaputra |
|
|
What mountains do these rivers erode? |
The Himalayas |
|
|
How much alluvial sediment is deposited? |
1,820 million tonnes |
|
|
The amount of alluvial sediment is twice as much as the annual load of which rivers together? |
Amazon Nile Mississippi |
|
|
How much of Bangladesh lies underwater? |
10% |
|
|
To what percentage does the submerged area of Bangladesh increase to in the summer? |
25% |
|
|
Why does the increase in the percentage of Bangladesh submerged occur? |
It is flooded by monsoon rains and swollen rivers |
|
|
What are the "good" floods called? |
Barsha |
|
|
What are the bad floods called? |
Bonna |
|
|
How much of Bangladesh can a bonna flood flood? |
40% |
|
|
What two physical factors caused flooding? |
Spring snowmelt Monsoon rain |
|
|
What human factors caused flooding? |
Management techniques Deforestation in the upper drainage basin Urbanisation and population pressure Climate change |
|
|
Why are the barsha floods critical to Bangladesh's economy? |
Agriculture relies on flooding |
|
|
What does flooding add to the soils? |
Alluvium - silt, nutrients etcetera
The alluvium replenishes the nutrients used on the previous year's crop |
|
|
What is grown during the dry season (November to May)? |
Rabi - wheat or dry rice
Aus is a drought-tolerant rice |
|
|
What is grown during the wet monsoon season (June to October)? |
Kharif varieties of wet rice such as Aman |
|
|
What can happen, in relation to farming, in places where floods are shallow? |
Two wet monsoon rice harvests are possible |
|
|
How many species of fish live in the fresh water rivers of Bangladesh? |
260 |
|
|
How many of these are a critical source of protein? Give a single example. |
Three
The hilsa fish |
|
|
What does flooding to regarding fishing? |
Flooding extends the aquatic ecosystem, creating breeding ponds and pools across the floodplain
These areas "teem" with life |
|
|
What is fished near the coast? |
Prwans |
|
|
What does fishing also open up? |
Jobs |
|
|
How do school children help out with fishing? |
They collect "small hatchlings from ponds in order to stock local fish farms" |
|
|
What happens to aquifers? |
They are replensished |
|
|
What are the detrimental effects on people? |
Deaths Homelessness and refugees Social disruption Illness spread by lack of food or contaminated water, such as diarrhoea trphoid |
|
|
What are the detrimental effects on property? |
Homes destroyed in cities and remote rural areas Businesses and buildings destroyed Food crops washed away and livestock drowned Transport links, including road and railway links, washed away or covered |
|
|
What are the detrimental effects on land? |
Shifting river channels Islands, known as chards, eroded or removed |
|
|
In 1998, when did great flooding occur, and what rivers were involved? |
Ganges and Brahmaputra 1998 between July and Octover |
|
|
How much of the land was covered? |
65% |
|
|
How long did the floods last? |
Over three months |
|
|
How many homes were destroyed? |
300,000 |
|
|
How many inhabitants left Dhaka? |
30 million |
|
|
How many deaths were caused by flooding from drowning, mudflows and house collapse? |
800 |
|
|
How much road was washed away? |
11,000km |
|
|
What was the economical impact estimated to be? |
Over £1 billion |
|
|
What crop was destroyed? |
The rice crop of late summer, the second Kharif |
|
|
How many "heavy lifting" helicopters did the country have? |
3 |
