Download - Sec 1 geog unit 4 lesson 4
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Chong Boon Secondary Geography Department
Sec 1 GeographyUnit 4 Lesson 4
Water Supply: Causes of water shortage
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Thinking questions
•What causes water shortage? What are the big uses of water?
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Lesson Objectives
• In this lesson, you will–Identify the reasons for global
water shortage.
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Factors that cause water shortage• There are two main categories of
factors–Demand Factors• Factors that lead to man seeking more
water.–Supply Factors• Factors that affect the availability of
water to meet the demands by man.
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Population Growth
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Demand Factors
• Population Growth– As global population increases, the total amount
of water demanded increases.– Global Population has increased from 1.6 billion in
1900 to 3.1 billion in 1960 and to 7 billion in 2014.– Most of the population increase is in Less
Developed Countries (LDCs)– These are where there is also the largest water
shortage.
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Affluence
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Demand Factors• Affluence–Having wealth and being able to live
comfortably.–Developed countries tend to be affluent.–Affluent countries consume more water due to
the lifestyle of the people there. –With more money, people consume goods that
are produced using more water and live a lifestyle that consumes more water.
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Seasonal Rain
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Supply Factor• Seasonal rainfall–Countries with variation in rainfall will face
water supply issues. –Seasonal rains (monsoons) bring large
rainfall in small pockets of the year. –Seasonal rains also lead to dry seasons
where there is minimal rain.–Singapore does not have such problems.
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Climate Change
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Global Climate Change• Global climate change will result in
change in seasonal rain.• Intensity and timing of seasonal rains
are affected by global climate change.• With Global warming, some areas
have less water while others suffer floods.
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Water Pollution
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Supply Factors
• Water Pollution–Pollution is the introduction of substances
into the natural environment (air, water, land).–With pollution, water quality will drop. If it
becomes unusable for humans, total water source will be reduced.
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The Ganges River
• Largest river in India• Used by over 400 million people• Used for drinking, bathing and
irrigation, spiritual significance.• Industrial waste dumpsite.
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The Ganges River
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Summary
Are you now able to
• Identify the factors that affect demand and supply for water?
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Let’s do a summary exercise