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Science - Chapter 11 - Water (Water Use and Management)
Terms in this set (23)
Most water must be treated to make it portable, or safe to drink.
Water treatment removes pathogens, which are organisms that cause illness or disease. Pathogens are found in water contaminated by sewage or animal feces.
A structure built across a river to control the rivers water flow.
Is formed behind a dam. A artificial lake can be a reservoir. Water from a reservoir can be used for flood control, drinking water, irrigation, recreation, and industry.
Global Water Use
Most of the fresh water used worldwide is (Agricultural) used to irrigate crops. The highest percentage of industrial water use occurs in Europe and North America.
Residential Water Use
There are differences in residential water use throughout the world. In the United States, only about half of residential water use is for activities inside the home, such as drinking, cooking, washing, and toilet flushing. Outside the home include activities such as watering the lawns, and washing cars.
Industrial Water Use
Water used to manufacture goods, to dispose of waste, and to generate power. Most of the water used in industry is used to cool power plants.
Agricultural Water Use
Agricultural water use accounts for 67% of the water used in the world.
The three major uses for water are?
Residential use, Agricultural use, and Industrial use.
Drinking Water Treatment (6 Steps)
First Filtration, Coagulation, Second filtration, Chlorination, Aeration, and Additional Treatment
The source water supply (i.e. river, lake) is filtered to remove large organisms and trash.
Alum is rapidly mixed into the water and forms sticky globs called 'flocs'. Bacteria and other impurities cling to the 'flocs', which settle to the bottom of a tank.
Layers of sand, gravel, and hard-coal filter the remaining impurities.
Chlorine is added to prevent bacteria from growing in the water.
Air is forced through the water to release unwanted gases, which reduce odor and improves taste.
Fluoride may be added to prevent tooth decay, or the addition of sodium to soften hard water. Finally treated water is pumped from storage tank to homes and businesses.
Is a method of providing plants with water from sources other than direct precipitation.
Water Management Projects
Include projects such as building dams and water diversion canals, and have various goals, such as bringing in water to make a dry area habitable, creating a reservoir for recreation or drinking water, or generating electric power.
Water Diversion Projects
Are designed to supply dry regions with water, all or part of a river can be diverted into canals that carry water across great distances.
Is one way that we can help ensure that everyone will have enough water at a reasonable price.
Drip Irrigation Systems
Offer a promising step toward water conservation. Drip irrigation systems deliver small amounts of water directly to plant roots buy using perforated tubing.
Solutions for the Future
Two possible solutions are desalination and transporting fresh water.
Is the process of removing salt from salt water. Most desalination plants heat salt water and collect the fresh water that evaporates.
Managerial role needs to be focused during the emergence and existence stage of the small business life cycle.
What best describes the general character of the three generally accepted auditing standards classified as standards of field work?
what is the highest form of media richness?
In service operations, significant volume increases can and frequently are made without changes in the service process, as would be expected in manufacturing. true or false?
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