Droughts

HideShow resource information
View mindmap
  • Natural Hazards: Droughts
    • What causes drought
      • Global warming
      • Using too much water
      • Deforestation/desertification
      • Overgrazing
      • Precipitation loss
    • Factors affecting the severity of drought.
      • Climate
        • Areas of low rainfall re more susceptible to drought; temperatures affect evaporation.
      • Social
        • Demand for water is greater in developed countries
      • Economics
        • Whether people or countries can afford reservoirs, wells etc.
      • Politics
        • War can access people's access to water. In developed countries it is easier to implement laws to control people's water use.
      • Technology
        • New and developed can impact the efficiency of water storage and ways to supply water (plumbing)
      • Environment
        • Different land uses affect run off rates: Different types of rock allow water to be stored or run across the surface.
    • Coping with drought
      • LEDCs
        • Most LEDCs are mostly subsistence communities s therefore they won't be able to grow food or make profit.
      • Long term
        • These are responses that result in permanent water management measures, which are designed to secure more water for everyday use.
          • Construction of dams and pipelines installing irrigation systems
      • Short term
        • Temporary methods used to overcome specific drought events.
          • They concentrate on reducing water demand such as water rationing and cash/food aid.
    • How can the impact of drought be controlled?
      • Responses to drought
        • Improve forecasting and monitoring
          • monitoring of temperatures over time may give advance warning of droughts
          • use of satellites to spot early changes in vegetation can help people prepare for droughts
        • Improve water conservation and farming methods
          • Low tech
            • low walls built across fields to reduce run-off
            • areas created for tree planting to conserve moisture in soil
            • using micro-dams to store water that can then be used for irrigation
            • using stone piles to collect water by allowing water to condense onto the cold stones
            • planting drought-resistant crops that can withstand a lack of water
          • High tech
            • drip-and-sprinkle irrigation
            • use of concrete water coolers to utilise hot groundwater
            • improving water supply and irrigation by building reservoirs and new wells
            • cloud seeding - injecting clouds with 'seeds' of silver iodine, salt or dry ice to make the clouds' water or ice particles bigger and yield more rain.

Comments

No comments have yet been made

Similar Geography resources:

See all Geography resources »See all Natural hazards resources »