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Environmental Science Chapter 11.2 Water use and Management
vocabulary and concepts
Terms in this set (16)
safe to drink. Most water must be treated to make it POTABLE.
An organism that causes disease or illiness. Water not treated can contain PATHOGENS. Found in water contaiminated by sewage or animal feces
Baterica;, viruses, protozoa, and Parasitic worms
Water treatments remove the following from polluted water:
mercury, arsenic and lead which are poisonous to humans even in low concertains
Figure 6 on pages 276-277 Steps in Water Treatment
1. First filtration: removes large organisms and trash
2. Coagulation: Alum is rapidly mixed into water and forms sticky globs called FLOCS. Bacteria and other impurities cling to the flocs and settle to the bottom of the tank
3. Second filtration: Layers of sand, gravel and hard coal filter the remaining impurities
4. Chlorination: chlorine is added to prevent bacteria from growing in the water.
5. Aeration:Air is forced through the water to release unwanted gases which reduces odor and improves taste
6. Additional treatments in some communities: addition of fluoride, Sodium or lime to soften water. Treated Water is then pumped from storage tanks to homes and businesses.
Industrial Water Use (3)
19% of the water used in the world.
1. Used to manufacture goods
2. to dispose of waste
3. to generate Power
Water use to generate power
Most is used to cool power plants. Cool water pumped from river into the plant and recycled back to the river usually warmer but generally clean and can be used again,
Agricultural Use of Water
67% of the water used in the world.
1. Irrigation-providing water from sources other than rain
Water Management Projects
Provides water to areas where the natural distribution of surface water is inadequate
2. Water diversion canals
Water managements projects goals
1. Bringing water to an area to make it habitable
2. Create a reservoirs for recreation or drinking water
3. Generating electric power
Water Diversion Projects
To use canals to carry water great distances for irrigation, or drinking water in dry regions
Dams and Reservoirs
Dam: structure build across a rive to control the river's flow
Dams create and artificial like or reservoir behind the dam.
Disadvantages of dams
1. Displacement of populations in flooded area
2. Farm land below the dam may be come less productive because the fertile sediments are deposited in the reservoirs.
3. Dam failure which causes loss of life and property
careful use and protection of water resources
Water Conservation in Agriculture
80% of the water used in Agriculture is lost due to:
Solution to problem: Drip irrigation systems
Use of oceans to provide fresh water. This is the removal of salt from salt water
What are the 3 principles of conservation biology?
Winter in the Northern hemisphere: is the Earth closer to or farther away from the Sun?
What is meant by surface tension of water?
How is a cold front depicted on a weather map?
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