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Hannah Waldal

on 20 March 2013

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By: Hannah Waldal& Tyler the Kaes Hydroelectric Power Definition: How it is formed: Big Dam Sources: Big Dam Sources (Cont.) A dam is built on lakes or rivers, where water flows through the dam and using gravitational potential energy turns the turbines to create energy. 1. Three Gorges Dam (China) 39,300,000 Cubic meters
2. Samara Dam (Russia) 169,000,000 Cubic meters
3. Tarbela Dam (Pakistan) 121,720 Cubic meters 4. Fort Peck (Montana) 96,040 Cubic meters
5. Lower Usuma (Nigeria) 93,000 Cubic meters
6. Tucurui Dam (Brazil) 85,200 Cubic meters Changing kinetic energy in water into power that we can use Three Gorges Dam Fort Peck Dam How is Hydroelectric Power Obtained? As water flows through the reservoir and turns the turbines, the energy from the turning turbines is stored in a generator which can be used as electricity. Advantages to Hydroelectric Power Renewable resource: dams use the water without decreasing the quantity to create energy Another Advantage Clean and Cheap: Dams last a long time and require minimal maintenance. They don't release pollution into the air and they collect rainwater for irrigation and drinking water Disadvantages to Hydroelectric Power Could cause flooding on land that may destroy the natural environment around a dam. More Disadvantages Expensive to build. They can cost millions if not billions of dollars and take years to build. Cost to Obtain Building a dam can cost millions of dollars but the energy that it produces is one of the cheapest energy sources available. It costs around 9 cents for every hour of use. Wastes There is virtually no waste unless you count the water that comes out the other side of the dam. Consumer Cost States that use hydroelectric energy have lower energy prices than other states because running water is dependable unlike the oil market or some other form of energy. How long will it last? Dams usually last up to 100 years and running water is very abundant Recent Research They are now developing things to harness wave and tide energy by bobbing on the waves to generate energy. Major Companies? What do I think? I think that if it's cheaper then it has to be good for someone. I don't think it is good for fish though How does this dam thing work? A dam is built where water can flow through it and when it flows through it turns the turbines inside and changes the kinetic energy into electricity that can be stored. How is a dam built? Usually starts in the summer when river levels are lowest, then you have to remove all the rocks from the river bed so that you can begin building. After it's built they close off the gates to let the river level rise before opening them and creating energy. How much energy is produced from dams? 19% of the worlds electricity comes from dams. Dams in Idaho Dams on the lower Snake river are controversial because it prevents salmon from returning up stream to lay eggs. http://www.wildsalmon.org/facts-and-information/faq/why-remove-the-4-lower-snake-river-dams.html http://ga.water.usgs.gov/edu/wuhy.html http://members.optusnet.com.au/~engineeringgeologist/page10.html http://members.optusnet.com.au/~engineeringgeologist/page5.html Hydroelectric power is biggest in China and the major companies involved are China Southern Power Grid Corporation, Huaneng and Datang. http://www.internationalrivers.org/campaigns/chinese-dam-builders How much energy does a dam produce? A dam can run 300,000 houses for a sixth the cost of oil. http://www.altenergy.org/renewables/hydroelectric.html Three Gorges Dam The Three Gorges Dam is sandwiched between 2 limestone cliffs and although it creates 8 times more power than the Hoover dam it causes environmental disasters like land slides and earth quakes http://www.scientificamerican.com/article.cfm?id=chinas-three-gorges-dam-disaster http://www.cnbc.com/id/30194554 http://www.teachengineering.org/view_lesson.php?url=collection/cub_/lessons/cub_dams/cub_dams_lesson08.xml
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