Flooding In Bangladesh

Description

Rivers And Coasts Flooding in a LEDC
Olivia Brooklyn
Mind Map by Olivia Brooklyn, updated more than 1 year ago
Olivia Brooklyn
Created by Olivia Brooklyn over 10 years ago
114
1

Resource summary

Flooding In Bangladesh
  1. Bangladesh
    1. Densely Populated
      1. One of the worlds poorest countries
        1. 140 million people live on flood plains (80% of land is flood plain) of the river Ganges, Brahmaputra and Meghna
        2. Affected by two types of floods
          1. River floods
            1. Happen every year and are part of natural cycle of snow-melt and monsoon rainfall
              1. Floods bring millions of tons of silt that adds to the soil's fertility
                1. Flood water is used to irrigate farmland and is important part of the yearly cycle of agriculture
                  1. Flood water mostly controlled by storm drains and embankments
                    1. Some years the volume and pattern of rainfall is extreme and water level rise dangerously high causing severe floods
                    2. Coastal floods
                      1. Created by cyclones that build up in the Indian Ocean and move towards the Bay of Bengal. Water is funnelled towards Bangladesh creating a storm surge
                    3. Causes of floods
                      1. Trees cleared for fuel and grazing so increased surface runoff
                        1. Heavy monsoon rains causes summer flooding
                          1. Melting of snow from the Himalayas adds to the volume of water in warmer months
                            1. Deforestation in the Himalayas increases surface runoff
                              1. 70% of total land area is less that 1m above sea lever - nowhere for water to drain
                                1. Increases surface run-off leads to soil erosion and more silt, raising river beds
                                  1. Meeting of 3 huge rivers increases the flood risk
                                    1. Cyclones create a storm surge
                                      1. Rapid unplanned urban growth has added to the problem of flooding
                                      2. Although physical factors increase the risk of flooding, there is an increasing number of human influences
                                        1. 1998 Flood
                                          1. Rain exceptionally heavy and water levels reached record heights
                                            1. Floods covered nearly 60% of the country
                                              1. All main river channels were flooded
                                                1. Capital city of Dhaka and number of regional cities were flooded
                                                  1. Hundreds killed and millions homeless
                                                    1. Agriculture land and crops were lost / contaminated by polluted water
                                                      1. 900 bridges and 15,000km of roads were destroyed
                                                      2. 2004 Flood
                                                        1. Monsoon arrived early and heavy rain fell from late June
                                                          1. Brahmaputra and Meghna Rivers had risen above their danger levels
                                                            1. A week later, flood waters drained southwards and Dhaka had begun to flood
                                                              1. Flood waters over-topped many flood protection embankments, inundating areas not provided with storm drainage systems
                                                                1. Affected 36 million people
                                                                  1. Mid-August flood waters fallen in most areas
                                                                  Show full summary Hide full summary

                                                                  Similar

                                                                  Coastal Zone Glossary
                                                                  Clare Magor
                                                                  Restless Earth Glossary
                                                                  Clare Magor
                                                                  Geography Quiz
                                                                  PatrickNoonan
                                                                  Geography Coastal Zones Flashcards
                                                                  Zakiya Tabassum
                                                                  Using GoConqr to study geography
                                                                  Sarah Egan
                                                                  All the Countries of the World and their Capital Cities
                                                                  PatrickNoonan
                                                                  Tectonic Hazards flashcards
                                                                  katiehumphrey
                                                                  Volcanoes
                                                                  1jdjdjd1
                                                                  River Processes and Landforms
                                                                  1jdjdjd1
                                                                  GCSE Geography - Causes of Climate Change
                                                                  Beth Coiley
                                                                  The Rock Cycle
                                                                  eimearkelly3