it occurs when the demand for water exceeds the amount available during te time period.
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THE SAHEL CASE STUDY- EXPLAIN.
Belt of semi-arid land south of the sahara desert, not muh rainfall. droughts causes seansonal rivers and water holes to dry up, disaster for the nomads and subsistence farmers. developing country , famine and water shortage.`
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what will global warming lead to for water world?
changes in climate patterns so rain-bearing winds will reach some areas less regularly. increase in the rate of glacier melting, more extreme weather events.
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how can richer countries buy themselves out of water stress? give examples?
Saudi Arabia can afford to build desalination plants (convert sea water to drinking water)
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what is water used for?
industry- farming. power generation (HEP) it can also ceate wetland habitats which are important environmentally for their biodiversity.
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what are negative impacts of building reservoirs?
loss of land, source of disease becuase they are home to insects such as mosquitoes, vegetation downed by the lakes decaysnand releases methane and carbon dioxide.
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how does deforestation effect the water cycle?
removing the trees reduces evapotranspiration so less green water is recycled. it exposes the soil surface to intense heat which hardens the ground making it impermeable and increasing run off. loss of soil nutrients because of the loss of biomass.
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what are negative impacts of dams?
construction plays problems with fragile aquatic ecosystems destroying fisheries and wildlife. people have to be relocated.
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THREE GORGES CASE STUDY- EXPLAIN.
26 GENERATORS capeable of geneating 84.7 billion kwh of electricity a year. prevent seasonal flooding . relocation of 1.4 million people from 1200 villages
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what are some small scale solutions to managing water supplies?
wateraid or practical action. rainwater harvesting.
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DHAKA BANGLADESH CASE STUDY- EXPLAIN.
Its a slum had no safe water or toilets. but with the help of the organisation called propiplan things are chaning. six tube wells have been constructed.
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