Section A
Riverwood Fish Kill
 Read the article and study the map
 Answer the questions about the fish kill
Facts/Questions
Why did the fish die?
Uses of Water
How is water used in eggs?
Facts
 2 eggs is equal to:
 Taking 10 showers
 Washing 10 loads of clothes
 25 loads of dishes
 Flushing toilet 100 times
 How could this be?
Water
and
household
goods
 Water required to produce foods and metals
 Beef
 Al
 Rice
 Rubber
 Sugar
 Flour
 Steel
20,859 L/kg
8,348 L/kg
4,163 L/kg
2,511 L/kg
1,025 L/kg
617 L/kg
286 L/kg
Foul Water Lab
 Percent recovery = final/initial X 100
Water Supply and Demand
 Could we ever run out of water?
Facts
 Each day 4 trillion gallons of rain or snow falls in the
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US
Only 10% of it is used by humans
A typical family of four uses 390 gallons of water per
day (direct use)
Less than 10% of people in the world have access to
clean water
You must drink between 2 and 5 L of water per day
Water Use
 Direct - The measurement of water that can be directly
measured
 ex.
 Indirect – hidden uses of water that can not be directly
measured
 ex.
 We use approximately 1645 gallons of water per day
Water Use Con’t
 http://water.usgs.gov/watuse/
Geographic Distribution
 Any interesting points?
Geographic Distribution
 Prevailing winds drive evaporated water from the west
to fall in the east. So the west needs much more water
for irrigation than the east does.
Where does water come from?
City Water
 Comes from underground water pipes
 Travel downhill from a reservoir or water tower
 Goes to the water tower from the treatment plant
 Goes to the treatment plant from a reservoir, lake, or
river
Water Locations
 Surface Water – water that is found on the surface of
the earth
 Ground Water – water that is found below the earth’s
surface
 Aquifer - Aquifers are structures that are porous rocks
that act like sponges, they can hold water for
thousands of years
Water Locations
Rural Water
 Comes from a well
 Water is pumped from an underground aquifer to the
well
Pure Water
 Is it possible to have 100% pure water?
Pure Water
 Neither source of water is pure, there are dissolved
minerals, gases and other impurities that contaminate
the water
Water Use Analysis
 How could you reduce the total water use in your
household for 3 days?
 Which water use would be eliminated? What would be the
consequences?
 Suggest ways to reduce the water needed for essential tasks
 Which uses would allow you to recover most of the used
water, even if it were not as clean as it was before?
Riverwood Water Crisis
 In Riverwood there is a strict water ban, each
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household is allowed 40 gallons of water for three days
List three water uses that you could do without?
List one water use that you could NOT do without?
For which tasks could you reduce your water use, and
how?
Which situations would allow you to reuse water?
Quote
 “When the well is dry we learn the worth of water” ~
Ben Franklin
 How does this apply in today’s economy?