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Location: Chile
Total dams: 6 (Ralco is largest- under construction)

Over 1 million people use the river for drinking water, irrigation, recreation, and fishing.

The dam will flood over 70 Km of river valley, destroying diverse forests and wildlife.

Displaced 700 native Indians.

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How does it affect species living in these rivers? 

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How does it affect species living in these rivers? 

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Direct: fish and other organisms can be injured or killed by turbines

Indirect:
1.  In reservoirs, water is more stagnant.
2. Water is loss through evaporation.

Silting: increase in concentration of sediments where it is undesirable

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Global warming emissions are produced during the installation and dismantling of hydroelectric power plants. After the water in the dam is flooded, the vegetation and soil decomposes and releases both carbon dioxide and methane gas.

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Hydroelectric dams reduce flood hazards.
-Reduces congestion of runoff in plains and coastal lands.
-River flow in the downstream reduces depending on withdrawals from dams through canals or pipelines.
-Reduced frequencies of floods and reduced peak flows reduce the agricultural and non-agricultural losses.
-Capture floodwaters and can release them under controlled circumstances to the river below, or the water can be stored.

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A dam is a man-made structure built across a river.
- Built to control river flow
- Improve navigation
- regulates flooding
How do they make hydroelectric power?
Hydroelectric power is produced  as water passes through a dam, into a river below. The more that passes through a dam, the more energy is produced.
Electricity is produced by a turbine which contain metal coils surrounded by magnets.
Pros: Provide clean, pollution free energy.
Cons: Harms the environment by hurting species that use rivers to spawn.
The highest dam in the U.S. is located in Oroville, California that rises 754 ft (230 meters) and more than a mile wide (1.6 Km). The nearest dam to us is the HOA dam in Garland, Tx.

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1. https://www.originenergy.com.au/blog/about-energy/what-is-hydropower.html

2. http://www.mbgnet.net/fresh/rivers/dams.htm

3. http://www.icid.org/dam_pdf.pdf

4.  http://www.hydro.org/why-hydro/other-benefits/

5.
http://www.ucsusa.org/clean_energy/our-energy-choices/renewable-energy/environmental-impacts-hydroelectric-power.html#.WMdA61UrLrc

6. https://water.usgs.gov/edu/hyhowworks.html

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Rotating blades spin a generator that converts the mechanical energy of the spinning turbine into electrical energy.

Pumped storage: when electricity demand is low, water is pumped back into the dam to be released again the next day

Reservoir:  body of water formed by damming a river or stream.

Intake: the place or opening at which a fluid is taken into a channel, pipe, etc.

Penstock: a closed pipe for conducting water into the powerhouse

Powerhouse: houses generator and turbine

Generator: converts rotational energy from a turbine into electrical energy

Turbine: A wheel or rotor that moves due to fast-moving water

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1. Renewable energy: Energy from a source that is not a depleated when used

2. Uses water stored in dams as well as flowing rivers to create electricity.

-China is the largest producer of hydroelectric energy-