Case studies flood in britain & bangladesh
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Case studies flood in britain & bangladesh






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Case studies flood in britain & bangladesh Case studies flood in britain & bangladesh Presentation Transcript

  • Case Studies:Floods in Southern Britain 2007 (MEDC) Floods in Bangladesh 2004 (LEDC)
  •  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
  • Tees Humber The flood threat Trent to England and Wales Great Ouse TrentSevern Tees Thames SevernAvon Thames Avon Great Ouse Humber
  • Source BBC
  •  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)
  •  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
  •  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
  •  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
  •  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
  •  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.