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Clean Fresh Water A Limited Replenishable Resource

Clean Fresh Water A Limited Replenishable Resource. Darlene Oehlke. From a distance, the Earth is a blue planet. 70% of the surface is covered with water.

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Clean Fresh Water A Limited Replenishable Resource

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  1. Clean Fresh Water A Limited Replenishable Resource Darlene Oehlke

  2. From a distance, the Earth is a blue planet. 70% of the surface is covered with water.

  3. 97% of the Earth’s water is salt waterLess than 3% is fresh water 66% of all fresh water is trapped in glaciers, icebergs, snowLess than 1% of the fresh water is available for human use

  4. 97% of the water on the planet is salt water.

  5. Water Activity • Using the glassware given and 1000 mLs of water, make a short demonstration to model the stocks of water on Earth.

  6. Where is the water?

  7. The sun drives the water cycle

  8. The sun evaporates water from the ocean, the water condenses, winds bring the clouds over land…

  9. Water cycle review activity • Complete the diagram of the water cycle showing the following stocks: ocean, surface water, ground water (including aquifers), ice and snow. • Label the flows: precipitation, infiltration, runoff, evaporation, condensation, discharge, melting, freezing

  10. Three categories of water use: • Irrigation for agriculture • Industry • Domestic use

  11. Agricultural Use 70% of fresh water use is for irrigation - Much is wasted Standard irrigation (50% gets to roots and 50% is wasted)

  12. Irrigation

  13. Pollution from Agricultural runoff

  14. Agricultural runoff

  15. Industrial water pollution

  16. Domestic use in MEDC’s

  17. Water Pollution Human waste: sewage

  18. Domestic Use • The average American uses 176 gallons of water per day compared to 5 gallons of water the average African family uses each day. (www.water.org)

  19. Two ways to solve a water crisis • Increase supply of water • Decrease the demand of water

  20. Ways to increase supply

  21. Ways to increase the supply • Desalinate salt water, in cities near the ocean. • Transport water from areas that have a lot of water. • Purify waste waters and reused • Harvest rain water • Harvest fog (Northern Chile) • Treat sewage and industrial waste

  22. Ways to decrease the demand of water

  23. Ways to decrease the demand of water • Use efficient irrigation systems • Charge more money for water • Fix the plumbing in your house • Teach people to use less water • Fix leaking pipes in public water systems

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