Flooding

floods

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  • Flooding
    • A flood
      • A flood occurs when a river breaks it banks and water spills out onto the floodplain
    • Physical causes
      • Impermeable rock
      • High density drainage basin
        • Or a steep sided drainage basin
      • High or prolonged amount of rainfall
    • Human Causes
      • Urbanisation
      • Deforestation
      • Lack of effective river management (lack of dredging)
    • Short term effects - positive
      • Flooding deposits fine silt - makes land fertile which is good for agriculture
      • Construction companies gain business from destruction caused by flood
      • Negative effects
        • Loss of Life
        • Property and buildings are destroyed
        • Infrastructure (e.g roads) are damaged
        • Loss of shelter
        • Loss of drinking water supply
    • Long term effects
      • Disease Spreads
      • Poverty cycle
      • In poor countries - migration from flood prone areas to shanty towns
      • Local economy damaged
      • Flood management schemes are set up
  • Physical causes
    • Impermeable rock
    • High density drainage basin
      • Or a steep sided drainage basin
    • High or prolonged amount of rainfall

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