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Global   Water  RESOURCES CBSE – Std X As per  NCERT  geography textbook – Contemporary India II
THE  BLUE  PLANET From outer space, the Earth looks   BLUE   in colour. That’s because approximately 70% of the Earth is covered with water
Q.   Do we have less water today than a million years ago? Then
Now A.  The same  amount of water
The  water cycle Transpiration
Is there a  water problem? Approximately  70%  of the Earth’s surface is covered with water. The absolute quantity of water has not changed over the years. Then why are we talking of a   water crisis? Why do we need to conserve water?
DISTRIBUTION OF   GLOBAL WATER
If all the world’s water could fit into a bucket Water available for drinking would be less than a teaspoon  Sustainable freshwater  supply for human use =   0.01% Recommended activity - A drop of water Salt Water  =  97.5%
Mismatch between regions of large population and available freshwater resources Fresh  Water  Stress 2025 Estimates 2 / 3 of the world’s population underwater-stress conditions. 3 billion people affected by water scarcity . Source: http://www.unep.org/dewa/assessments/ecosystems/water/vitalwater/21.htm#21b
The total amount of water in the world is the same, but there are more people wanting to use this water 1940 World population doubled (  increased by 3 bn  ) Freshwater use increased more than  4 times 1995 Population  and  water  Resources There is just not enough water!!!! 2050 Estimated  population   increase  =  2.7 bn
Every item  that we use needs  water for production CAUSES FOR WATER  STRESS Water evaporation  from reservoirs of large  hydro power projects   Domestic  bathing, flushing, washing,  cooking, drinking… Extensive  farming. High usage of water Industry  Increase demand  for goods Increase in Population  Water  stress!!!! Power Agriculture  People require  food to eat
Global water use by  Sector Evolution Of Global Water Use Withdrawal And Consumption By Sector Accessed in November 2008 Source: http://www.unep.org/dewa/assessments/ecosystems/water/vitalwater/15.htm
India, with more than a billion people, needs a lot of water to grow food for its population Agriculture Source: http://www.unep.org/dewa/assessments/ecosystems/water/vitalwater/15.htm
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],It’s   not just increased   consumption… For more details refer to the presentation on ‘Water pollution’. Increasing pollution of freshwater sources  ( surface and groundwater ) ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Additional  stress  in urban areas For more details refer to the presentation on ‘ Water resources of our city ’
SO… Is there a  Water   Problem? Yes ,  there definitely is. There is a  greater demand for freshwater Freshwater resources are being  polluted and are therefore unfit for consumption Skewed distribution of population and freshwater resources  leads to unequal access
India –  status  and  projections 1 / 6  of World’s Population 1 / 25  of world’s Freshwater  Resources Source: TERI
Dumb Charades A game to check how much you have learnt Play
Divide the class into 5 teams. Team A   selects 2 people who will guess the answer.  These  2  people turn their face to the wall or go out of the room, so that they can’t see the clue.  Play
Team A have to act out the clue for the 2 guessers.  Either all members of Team A can act it out (very boisterous, but all children are involved) or a representative is selected to do the acting.  The other members of  Team A   (and the rest of the class) see the clue.
If the guessers got the right answer in 30 secs, they get 5 points If the guessers get the right answer in 30 secs, they get 3 points  Otherwise   The chance then goes to  Team B  and so on. Rules: No mouthing of words
Round 1 Team A – Agriculture Team B – Domestic use Team C – Reservoir Team D – Population Team E – Industrial production
Round 2 Team A – Unequal access Team B – Over exploitation Team C – Urbanization Team D – Lifestyle Team E – Lake destruction
Round 3 ,[object Object],Team A  –  Fertilizer runoff Team B  –  Sewage disposal Team C  –  Industrial waste water Team D  –  Pesticides
Round 4 Team A – Water stress Team B – Groundwater depletion Team C – Diseases Team D – Life threatening Team E – Slum dwellers

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Global Water Resources

  • 1. Global Water RESOURCES CBSE – Std X As per NCERT geography textbook – Contemporary India II
  • 2. THE BLUE PLANET From outer space, the Earth looks BLUE in colour. That’s because approximately 70% of the Earth is covered with water
  • 3. Q. Do we have less water today than a million years ago? Then
  • 4. Now A. The same amount of water
  • 5. The water cycle Transpiration
  • 6. Is there a water problem? Approximately 70% of the Earth’s surface is covered with water. The absolute quantity of water has not changed over the years. Then why are we talking of a water crisis? Why do we need to conserve water?
  • 7. DISTRIBUTION OF GLOBAL WATER
  • 8. If all the world’s water could fit into a bucket Water available for drinking would be less than a teaspoon Sustainable freshwater supply for human use = 0.01% Recommended activity - A drop of water Salt Water = 97.5%
  • 9. Mismatch between regions of large population and available freshwater resources Fresh Water Stress 2025 Estimates 2 / 3 of the world’s population underwater-stress conditions. 3 billion people affected by water scarcity . Source: http://www.unep.org/dewa/assessments/ecosystems/water/vitalwater/21.htm#21b
  • 10. The total amount of water in the world is the same, but there are more people wanting to use this water 1940 World population doubled ( increased by 3 bn ) Freshwater use increased more than 4 times 1995 Population and water Resources There is just not enough water!!!! 2050 Estimated population increase = 2.7 bn
  • 11. Every item that we use needs water for production CAUSES FOR WATER STRESS Water evaporation from reservoirs of large hydro power projects Domestic bathing, flushing, washing, cooking, drinking… Extensive farming. High usage of water Industry Increase demand for goods Increase in Population Water stress!!!! Power Agriculture People require food to eat
  • 12. Global water use by Sector Evolution Of Global Water Use Withdrawal And Consumption By Sector Accessed in November 2008 Source: http://www.unep.org/dewa/assessments/ecosystems/water/vitalwater/15.htm
  • 13. India, with more than a billion people, needs a lot of water to grow food for its population Agriculture Source: http://www.unep.org/dewa/assessments/ecosystems/water/vitalwater/15.htm
  • 14.
  • 15.
  • 16. SO… Is there a Water Problem? Yes , there definitely is. There is a greater demand for freshwater Freshwater resources are being polluted and are therefore unfit for consumption Skewed distribution of population and freshwater resources leads to unequal access
  • 17. India – status and projections 1 / 6 of World’s Population 1 / 25 of world’s Freshwater Resources Source: TERI
  • 18. Dumb Charades A game to check how much you have learnt Play
  • 19. Divide the class into 5 teams. Team A selects 2 people who will guess the answer. These 2 people turn their face to the wall or go out of the room, so that they can’t see the clue. Play
  • 20. Team A have to act out the clue for the 2 guessers. Either all members of Team A can act it out (very boisterous, but all children are involved) or a representative is selected to do the acting. The other members of Team A (and the rest of the class) see the clue.
  • 21. If the guessers got the right answer in 30 secs, they get 5 points If the guessers get the right answer in 30 secs, they get 3 points Otherwise  The chance then goes to Team B and so on. Rules: No mouthing of words
  • 22. Round 1 Team A – Agriculture Team B – Domestic use Team C – Reservoir Team D – Population Team E – Industrial production
  • 23. Round 2 Team A – Unequal access Team B – Over exploitation Team C – Urbanization Team D – Lifestyle Team E – Lake destruction
  • 24.
  • 25. Round 4 Team A – Water stress Team B – Groundwater depletion Team C – Diseases Team D – Life threatening Team E – Slum dwellers