Chapter 11 - Water
Section 2 Notes
Did you know????
• According to the World Health
Organization, more than 1 billion people
lack access to a clean, reliable source of
fresh water.
Three Major Uses for Water
• Residential
• Agricultural
• Industrial
• See p. 277 Fig 5
• Which of the three major uses of water is
used the most in almost all countries?
• In how many countries does industrial use
out number residential use? Which
countries?
Residential Water Use
• The average person in
100
90
80
Water in Liters
•
the US uses 80
gallons of water per
day.
Half of this usage is
for personal use the
rest is for outside the
home activities.
Daily Water Use in the US Per Person
70
60
50
Series1
40
30
20
10
0
Law n
Cooking
w atering Toliet
Brushing
&
Bathing
Cleaning
Flushing
Teeth
and
Drinking
pools
95
90
70
10
20
10
Series1
Uses
Other
5
• Looking at this graph. Come up with 3 ways to
decrease the number of liters used by each
person in the US.
Daily Water Use in the US Per Person
100
90
Water in Liters
80
70
60
50
Series1
40
30
20
10
0
Law n
Cooking
w atering Toliet
Brushing
&
Bathing
Cleaning
Flushing
Teeth
and
Drinking
pools
95
90
70
10
20
10
Series1
Uses
Other
5
Water Treatment
• Potable –
• Pathogens –
• Bacteria, viruses, protozoa, and parasitic worms
are common pathogens.
• Water Treatment Worksheet
Industrial Use
• Accounts for 19% of the water used in the
world.
• Used to manufacture goods, dispose of
waste, and generate power
• Most water in industry is used to cool
power plants (ie. powerton)
• http://maps.google.com
Agricultural Water Use
• Accounts for 67 % pf the water used in
the world.
• It can take 300 L of water to produce one
ear of corn.
• 80% of the water used in agriculture
evaporates and never reaches the plant
roots.
• Irrigations –
Waste Management Projects
• Nearly 2000 years ago, Romans built
aqueducts to dry areas.
• Examples are dams, and water diversion
canals.
• Goals: bringing water to a dry area,
creating a reservoir for recreation or
drinking water, generating electric power.
Dams & Reservoirs
• Dam –
• Reservoir –
• Advantages & Disadvantages to Dams -
Water Conservation
• In Agriculture – most comes from
evaporation, seepage, and runoff
– Drip irrigations
• In Industry – recycling of cool water and
wastewater
– Pay business to conserve water
Water Conservation
• In Home – although it is a same % of use,
any conservation of water will help
– Take shorter showers
– Low-flow toilet
– Do not let water run when brushing teeth
– Wash only full loads in dishwasher and
washing machine
– Don’t water lawn or at least sparingly or in
the evening
Solutions for the Future
• Transporting Water –
– Advantages:
– Disadvantages:
• Desalination –
– Advantages:
– Disadvantages: