Clean Fresh Water A Limited Replenishable Resource

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 Earths water is salt water Less
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
(No Transcript)
6
Water Activity

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

7
(No Transcript)
8
Where is the water?
9
The sun drives the water cycle
10

• The sun evaporates water from the ocean, the
  water condenses, winds bring the clouds over
  land

11
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

12
(No Transcript)
13
Three categories of water use

• Irrigation for agriculture
• Industry
• Domestic use

14
Agricultural Use

• 70 of fresh water use is for irrigation - Much
  is wasted
• Standard irrigation (50 gets to roots and 50 is
  wasted)

15
Irrigation
16
Pollution from Agricultural runoff
17
Agricultural runoff
18
Industrial water pollution
19
(No Transcript)
20
Domestic use in MEDCs
21
Water Pollution

• Human waste sewage

22
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)

23
(No Transcript)
24
(No Transcript)
25
(No Transcript)
26
Two ways to solve a water crisis

• Increase supply of water
• Decrease the demand of water

27
Ways to increase supply
28
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

29
Ways to decrease the demand of water
30
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

31
(No Transcript)