Water 3.6

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Created by: nehamalaika
Created on: 27-03-21 13:01

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Water 3.6
- methods of waters supply
  - reservoirs/dams
    - prevent flooding
    - provide recreation area
  - wells
  - boreholes
    - important where surface water is scarce
      - wells
  - desalination
    - reverse osmosis
    - distillation
    - expensive, most important in middle east
  - cloud seeding
- uses of water
  - In LEDCs
    - most water used in agriculture
    - use less water
  - In MEDCs
    - domestic uses
    - industrial uses
- Sahel Drought
  - causes
    - desertification due to deforestation, overgrazing
      - less transpiration = less rainfall
    - Increased temp of Indian and Atlantic oceans
      - smaller gap in temp - monsoon rain reduced
  - Consequences
    - crop failure, death of livestock
    - Increased soil erosion
      - long term effects on agriculture
      - sediment washed into rivers, contamination
    - water-related diseases
    - food shortage
  - Management
    - drought resistant crops
    - improve knowledge of drought across region
    - more efficient irrigation systems
      - drip instead of spray
    - rock lines slow rainwater, deposition of sediment
- Bermuda
  - Roofs
    - limestone - heavy
    - white latex paint
    - have to collect 80% of water
    - slanted, stepped
      - then gutter, then underground storage tank
    - arial infection, not enough
      - 200 000 toursists in summer
    - 1 400 mm/year
  - Other sources:
    - import from us, canada, europe
    - desalination - reverse osmosis
      - expensive, energy
      - 6 plants
    - brackish and salt water
      - pools and toilets
    - reuse freshwater
      - for irrigation
  - aquifers
    - aeolian limestone
    - pumped from lenses
      - then filtered, chlorinated