Flooding Case Studies

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  • Created by: SammoG
  • Created on: 06-02-15 11:27
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  • Flooding Case Studies
    • Bangladesh 1998
      • Facts
        • Population= 12 Million
        • $200 per person GNP
        • 3 Major rivers- Meghna, Ganges and Brahmaputra
      • Causes
        • 70% of land 1m above sea level
        • 10% land is water
        • Experiences heavy monsoon rain
        • 3 major rivers reached peak flow at the same time
        • Snow melt from the Himalayas
        • Poorly maintained embankments
        • Urbanisation of the floodplain
        • Indian dams increase sedimentation
      • Effects
        • 57% of land flooded
        • 1,300 Deaths from flooded and disease
        • 7 Million homes destroyed
        • Shortages
        • $7 Billion damage
        • Water receded leaving rotted crops
        • Roads, Bridges and Villages destroyed
      • Long term management
        • Reduce deforestation is Nepal and the himalayas
        • 7 Large dams in Bangladesh- 40 years to complete
        • 5000 flood shelters to accommodate whole poulation
        • Create flood water storage areas
        • Develop effective flood warning system
        • New 7m High embankment
      • Short term management
        • Boats to rescue people
        • Emergencies supples sent
        • Fodder for livestock
        • Repair and rebuild houses and services
        • Aid from other countries
    • Boscastle 2004
      • Facts
        • Flash Flood
        • Cornwall, South England
      • Effects
        • 75 million US$ damage
        • 100 Homes and Businesses Destroyed
        • 75 cars destroyed
        • Uprooted trees and debris spread over a large area
      • Causes
        • Cars and waste blocked bridge causing a temporary dam
        • Steep valley sides and saturated griound
        • 7ft river level rise in 1 hour
        • 3.5 inches of rain in 60 minutes
        • Prevailing winds and Atlantic storm
        • 10mph water speed
      • Long term managment
        • River Channel Widened
        • Car park raised to reduce the risk of cars being washed away
        • Culverts improved to allow more water through
        • New bridge created with larger arch to prevent another dam
      • Short term management
        • Basic culvert created
        • Coastal path closed
        • Debris removed from the bridge
        • Food and water supplies restored
        • Basic culverts created
    • Sundarban
      • Mangrove Swamp- Bay Of Bengal- Ganges Delta
      • 3cm/year rise in the last 20 years
      • 4 islands lost to see
      • Major carbon sink
      • 200 bird species
      • Bengal Tiger Habitat

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