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Case study of flooding: LEDC/ MEDC
Transcript of Case study of flooding: LEDC/ MEDC
Rivers can flood and cause death and damage. The effects of flooding can be equally severe in MEDCs and LEDCs but MEDCs are well prepared to respond to floods.
Case study of flooding: LEDC/ MEDC
Examples of flooding in LEDC and MEDC
Flooding in LEDC: Rivers, causes
Rivers, causes, effects, ways
Flooding in LEDC: Effects, Ways
Flooding in MEDC: Rivers, causes
Flooding in MEDC: Effects, ways
Looking at two examples of river flooding in an LEDC and MEDC. Take note of name of rivers, causes, effects, and measures (if any) before flooding
Flooding in MEDC: United Kingdom
River Avon and River Severn, English Midlands, United Kingdom
Heavy rains as the warm winds passed the Atlantic Ocean
severe flooding in Hull, Doncaster and Sheffield.
1. Flash floods affected several towns in the Avon and Severn valleys.
2. Residents had begun to leave their homes.
3. 2000 people forced to spend the night in emergency shelters.
4. Flooding and extra volume of traffic: 10000 motorists to 10 hours on the M5 between Worchester and Gloucester.
5. Emergency services moving equipment such as potable steel flood barriers to places like Upton-on-Severn threatened by flooding
Flooding in LEDC: Bangladesh
1. Top of trees and buildings seen
2. Railways, roads and bridges swept away
3. No electricity for several weeks
4. Floodwater polluted wells: no safe drinking water
5. Hospitals full of people: dysentery, diarrhoea, cholera
6. Parts of Dhaka under 2 metres of water
7. Impossible to deliver overseas aid (food and medical supplies)
Rivers: Jamuna and Padma Rivers
Flooding annual event in Bangladesh
The monsoon rains: Jamuna (Brahmaputra) and Padma (Ganges) to overflow its banks between July and mid-August.
153 million inhabitants live on the floodplains of these rivers.
The seasonal flood:
-water to grow the main crops (rice and jute)
-silt to fertilise the fields.
Flooding (20% of the country) good for crops and the wildlife.
Lesser than 20% flooding means food shortages,
More than 20% meant loss of life, ruin crops and damage property.
In 1998, 68% of the country was flooded for more than 70 days.
1. Bangladesh on floodplain of Ganges and Brahmaputra rivers: below 6 metres above sea level.
2. Bangladesh has monsoon climate (1800 and 2600 mm) in four or five months (June to September)
3. High temperatures melt the ice/ snow in the Himalayas
4. Silt by rivers blocks the channel and rises the river bed,
5. building on floodplains
6. deforestation increases runoff
Warning of heavy rain. heavy rainfall occured on 20 July 2007. Two months of rain fell in 2 hours, and three times July’s normal total in 24 hours, on saturated soil and many rivers that nearly overflow its banks.
6. Water treatment works was forced to close, with 350000 people without water for washing, cooking or sewerage.
7. Floodwater began seeping into an electricity sub-power station, that can cut off supplies to 600000 homes: construction of a 1km embankment around the station
8. The clean-up operation took several months and cost over £2 billion.