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Case studies flood in britain & bangladesh


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Case studies flood in britain & bangladesh

  1. 1. Case Studies:Floods in Southern Britain 2007 (MEDC) Floods in Bangladesh 2004 (LEDC)
  2. 2.  Causes: • Total rainfall from May to July 2007 – were the highest on record, • Outstanding storms totals were recorded across much of Southern Britain • Intense rainfall recorded on 20th July • Flood risk summer is normally reduced by dry soil conditions, however, in this case the record early summer rainfall meant soil were already close to saturation • groundwater level  much higher little infiltration / percolation capacity • Drainage system failure
  3. 3. Tees Humber The flood threat Trent to England and Wales Great Ouse TrentSevern Tees Thames SevernAvon Thames Avon Great Ouse Humber
  4. 4. Source BBC
  5. 5.  People were evacuated from their homes (Hull – 8600 homes were flooded and many people had not returned 12 months later) Building & property were damaged Insurance claim abt £3 billion) Animalswere trapped and crops were ruined (thousands of hectare grain crops were lost)
  6. 6.  Public utilities were disrupted – electric, gas, water supply – Gloucester: 140000 homes without water for 2 weeks Transport & communications were flooded Economicimpact on shops, offices & industry – some closed for 1 week 300 schools were damaged in Yorkshire & Hummberside Political pressure put on government (funding double from 2000 to 2008
  7. 7.  Fact file: A low-lying country Lies on delta land of three major rivers: Ganges, Brahmaputra & Meghna Source of these rivers are in the Himalayas  snowmelts add to their discharge during spring
  8. 8.  80% of the country is floodplain and delta due to the confluence of three rivers: • The Ganges, Brahmaputra & Meghna Tropical cyclones bring heavy rain and storm surges cause coastal floods Heavy monsoon rains over the Himalayas, upland Assam & central Indian plateau The Himalayas are still growing with earthquakes  erosion and increased loads & sediments for rivers
  9. 9.  Deforestation– rapidly increase population in Nepal & Tibet removal of forest Reducedinterception, increased overland flow soil erosion & Landslides Dambuilding reduces downstream discharge, encourage sedimentation Global warming  higher rainfall in Nepal  rising sea level Urbanisationimpermeable concret speeds off run-off
  10. 10.  38% of total land area of the country is flooded 800 000 hectares of agricultural land and the capital city, Dhaka 36 million people were homeless Death toll up to 800, died due to disease as they had to access to clean water Caused serious damage to country’s infrastructure, roads, bridges railway lines Value of damage - $2.2 billion or 4% of total GDP Affect both the poor & wealthy areas, the slum dwellers, squatting on poorly drained land, suffered the most.