hydropower
DESCRIPTION
TRANSCRIPT
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HYDROPOWER
• Energy of moving water
• As long as sun shines and rain and snow fall we will have hydropower
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History
• Greeks used water wheels to grind wheat into flour over 2000 years ago
In early 1800’s, water wheels were used to power machines in factories
In the late 1800’s,
hydropower was first used
to generate electricity
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Photograph of old power plant above Niagara Falls
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Niagara Falls , American Falls
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Easier to build on a river where there is a natural waterfall
Athabasca Falls, Oregon
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Dams make artificial waterfalls
Bonneville Dam on the Columbia River between Washington & Oregon
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The water held back by the dams (reservoirs) are stored energy
Lake Powell Utah
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The dam needs gates to open & close
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The water spins the blades of the turbines
This is a turbine that has been
replaced at the
Bonneville Dam
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Old turbine being removed
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Replacement Turbine
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the generator (the turbine is underneath)
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Row of turbines
in the
powerhouse
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Power plant at Bonneville Dam
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Advantages
Cheapest way to produce electricity in the United States
Does not pollute
Does not add to global warming
Is a renewable energy source
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Disadvantages
*Changes the flow of the river
*Land floods where reservoir is formed
*Some beautiful, fertile land might be flooded
*People and businesses may need to relocate
* Fish and wildlife may be disturbed
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Example: Pacific Salmon
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Top view offish ladders
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Window into fish ladder
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Hydropower in the U.S.
Most hydropower
1. Washington
2. California
3. New York
4. Oregon
5. Tennessee
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http://www.msnbc.msn.com/id/21134540/vp/
24253799#24253799
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