Water our valuable resource

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Water our valuable resource

  1. 1. Water Resources Textbook page 114 - 125
  2. 2. Water Resources <ul><li>Lesson outline </li></ul><ul><li>Importance of water </li></ul><ul><li>Distribution of water </li></ul><ul><li>Reasons for water constraint </li></ul><ul><li>Solving the problem of water constraint </li></ul><ul><li>Effectiveness of the solutions </li></ul>
  3. 3. Importance of water <ul><li>Living things need water for survival and well-being – almost 70% of the human body consists of water </li></ul><ul><li>Water bodies are habitats for plants, animals and marine creatures </li></ul><ul><li>Water bodies are sources of food (seafood) for humans </li></ul><ul><li>Water is needed for many human activities such as washing and cooking </li></ul>
  4. 4. 97% - salt water 2% - frozen fresh water 1% - fresh water Distribution of water Unevenly distributed
  5. 5. Amount of fresh water per person
  6. 6. SURFACE RUNOFF GROUND WATER CONDENSATION EVAPORATION & TRANSPIRATION PRECIPITATION HYDROLOGICAL CYCLE
  7. 7. Reasons for water constraint <ul><li>Population growth - Increase in water usage for farming, industry and domestic use </li></ul><ul><li>Rising living standards - Increase in water usage for creating comfortable and convenient modern lifestyles </li></ul><ul><li>Pollution – chemical waste from factories, farms and households </li></ul><ul><li>Uneven distribution of water – lack of natural water sources or water is polluted </li></ul>
  8. 8. Solving water constraint <ul><li>Increasing the price of water </li></ul><ul><li>Increasing the size of catchment areas </li></ul><ul><li>Using technological advances </li></ul><ul><li>Conserving water through public education </li></ul><ul><li>Establishing international agreements </li></ul>
  9. 9. Solving water constraint <ul><li>1. Increasing the price of water </li></ul><ul><li>Reduces water wastage and promotes water conservation </li></ul><ul><li>Affects those who cannot afford to pay the higher price of water, the poor will suffer </li></ul>
  10. 10. Solving water constraint <ul><li>2. Increasing the size of catchment areas </li></ul><ul><li>Keeps the cost of water treatment down and rainwater is cleaner and does not contain salt </li></ul><ul><li>Forests are conserved and helps to slow down global warming </li></ul><ul><li>Less land available for other purposes such as housing, roads, industries </li></ul><ul><li>Catchment areas will not be useful during seasons of low rainfall or drought </li></ul>
  11. 11. Solving water constraint <ul><li>3. Using technological advances </li></ul><ul><li>- Recycling waste water, desalination and using pumps to extract groundwater </li></ul><ul><li>Costly, require a large amount of energy and only developed countries can afford </li></ul><ul><li>Recycled and desalinated water taste differently – many people are not used to it </li></ul>
  12. 12. Solving water constraint <ul><li>4. Conserving water through public education </li></ul><ul><li>Driving home the message that fresh water is limited and precious, and must be carefully used at all times through schools and campaigns </li></ul><ul><li>Government does not need to invest on water-related facilities and money can be used to improve infrastructure such as roads </li></ul><ul><li>Needs cooperation from everyone but many people do not see the importance of it </li></ul>
  13. 13. Solving water constraint <ul><li>5. Establishing international agreements </li></ul><ul><li>An arrangement between two or more countries regarding the supplying and use of water over a specific period of time </li></ul><ul><li>Enforcing water agreements can be difficult as there are often political issues tied to these agreements </li></ul>
  14. 14. Water Supply in Singapore <ul><li>Textbook page 128 - 133 </li></ul><ul><li>Lesson outline </li></ul><ul><li>Water situation in Singapore </li></ul><ul><li>Usage of water </li></ul><ul><li>Water as a strategic resource </li></ul><ul><li>Alternative sources of water </li></ul><ul><li>Challenges in the future </li></ul>
  15. 15. Reservoirs in Singapore Marina
  16. 16. Water Constraint in Singapore <ul><li>Limited water and can only supply half of what we need </li></ul><ul><li>Water shortage - due to no large river to provide freshwater and inadequate rainfall </li></ul><ul><li>Increasing demand of water due to growing population, providing better standard of living and developing high-tech industries </li></ul>
  17. 17. Usage of Water in Household
  18. 18. Water as a Strategic Resource <ul><li> Water scarcity makes us very vulnerable, long term water shortage will have a big impact on the whole nation </li></ul><ul><li>Machines in factories get overheated and cannot function – factories close down and jobs are lost </li></ul><ul><li>Restaurants and hotels cannot run businesses - tourist industry gets affected and revenue will drop </li></ul><ul><li>Lack of water for domestic use – standard of living drops and people might leave the country </li></ul>
  19. 19. Alternative sources of water <ul><li> Water from local catchment areas </li></ul><ul><li>Imported water - buying water from Malaysia (Expiry date of water agreements – 2011 and 2061) </li></ul><ul><li>Recycled water – removing impurities from used water </li></ul><ul><li>Desalinated water – removing salt from sea water </li></ul>
  20. 20. Our National Taps Local catchment area Imported water Recycled water Desalinated water Singapore’s Water Supply
  21. 21. Water Treatment at waterworks 1. Reservoir 2. Pumping Station 3. Raw water mixing chamber 4. Settling tank 5. Sand filters 6. Clear water tank 7. Pumping Station 8. Service reservoir
  22. 22. Marina Barrage
  23. 23. Barrage helps to control floods
  24. 25. How to conserve water  Water conservation taxes – additional fee added to the price of the water consumed by households and varies according to the amount of water they use
  25. 26. How to conserve water  Save water campaigns to encourage people to conserve water – talks conducted in schools, leaflets distributed to households, mobile exhibitions on the use of water-saving devices and water conservation tips
  26. 27. Tips on saving water
  27. 28. How to conserve water <ul><li>Water rationing exercises – supply of water is temporarily cut off to spread awareness on the importance of conserving water </li></ul>
  28. 29. We must conserve water !

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