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Impact of dams roumenova yanev_yaramov_10_4


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Impact of dams roumenova yanev_yaramov_10_4

  1. 1. By Violeta Roumenova, Daniel Yanev, & Emil Yaramov 10/4
  2. 2. Environmental Impact <ul><li>The turbines slow the water which then contains very little sediment which can lead to destruction of riverbanks (7.) </li></ul><ul><li>Lack of fish ladder blocks natural migration paths of fish-may </li></ul><ul><li>Might produce very high amounts of greenhouse gases (4.) </li></ul><ul><li>Contribute to earthquakes (3.) </li></ul>
  3. 3. The Turbines Slow the Water <ul><li>Fast water flowing from the river holds sediments </li></ul><ul><li>When it goes to the dam the water becomes very slow which leads to sedimentation (7.) </li></ul><ul><li>This increases the erosion down the river which can lead to destruction of river banks </li></ul><ul><li>This can be controlled by dredging and protecting the natural vegetation cover (7.) </li></ul>
  4. 4. Lack of Fish Ladder Blocks <ul><li>Lack of fish ladder blocks natural migration paths of fish </li></ul><ul><li>May lead to destruction of an entire ecosphere </li></ul><ul><li>This can be fixed by regulating the downstream flow and clearing natural vegetation (7.) </li></ul>
  5. 5. High Amounts of Greenhouse Gases <ul><li>The vegetation flooded by the reservoir rots producing methane as they decay </li></ul><ul><li>When methane rises most of it oxidizes to form carbon dioxide (4.) </li></ul><ul><li>95% of the methane produced is emitted at spillways, turbines and downstream </li></ul><ul><li>Have higher global warming impact than fossil fuel plants (4.) </li></ul>
  6. 6.
  7. 7. Contribution to Earthquakes <ul><li>Two theories </li></ul><ul><li>The mass of the water alters the stress points on the bedrock causing it to move (adjust) (3.) </li></ul><ul><li>Increases the groundwater pressure causing stress on the bedrock </li></ul><ul><li>Causes micro-seismic activity (<4.0 Hoover dam) (3.) </li></ul>
  8. 8. Dam Pressure
  9. 9. Benefits <ul><li>Hydro power plants located at the lowest point of the dam wall </li></ul><ul><li>Produce electricity without using non-renewable resources (7.) </li></ul><ul><li>Low amount of environmental harm compared to other types of power plants </li></ul><ul><li>Provide drinking water </li></ul><ul><li>Store water for dry periods (7.) </li></ul>
  10. 10. Nile River: Aswan High Dam <ul><li>Location: </li></ul>
  11. 11. The Aswan High Dam <ul><li> </li></ul>
  12. 12. Aswan High Dam: Problem and Impacts <ul><li>Cause of problem: poor drainage => saturation and increase in salinity (5.) </li></ul><ul><li>Impact: </li></ul><ul><ul><li>Economic: more than 1⁄ 2 of Egypt's farmland soil has worsened=>less crops produced (trade also affected) </li></ul></ul><ul><ul><li>Human health: number of individuals affected by the parasitic disease schistosomiasis (associated with stagnant water) has increased </li></ul></ul><ul><ul><li>Ecological: soil of farmlands becomes useless; salinity and poor drainage destroy soil (5.) </li></ul></ul>
  13. 13. Aswan High Dam: Problem Solution <ul><li>Possible solutions: </li></ul><ul><ul><li>Installation of wells to lower water table </li></ul></ul><ul><ul><li>Replacement of foundation stones with other materials </li></ul></ul><ul><ul><li>Injection of a chemical sealant between the structures and the soil in order to create a barrier (1.) </li></ul></ul><ul><li>This may be very expensive to accomplish </li></ul><ul><li>In addition, the construction of each of the above may cause harm to the surroundings (1.) </li></ul>
  14. 14. Sacramento Delta: Shasta Dam <ul><li>Location: </li></ul>
  15. 15. The Shasta Dam <ul><li> </li></ul>
  16. 16. The Shasta Dam: Major Problem <ul><li>Raising of dam => flooding of nearby canyons => endangering surroundings (wildlife, forests, etc.) = interference with other ecosystems (even destruction of ecosystems) (2.) </li></ul><ul><li>Money costs may also result (6.) </li></ul>
  17. 17. Works Cited <ul><li>1.&quot;Aswan High Dam.&quot; People and Place. 13 Apr. 2007. 8 Jun. 2010. <>. </li></ul><ul><li>2.Dawson, Elizabeth . &quot;Shasta Dam.&quot; Shasta Dam. 5 Dec. 1994. 8 Jun. 2010. <>. </li></ul><ul><li>3.&quot;Do Dams Cause Earth Quakes ? &quot;. Yahoo!Answers. 15 Jun. 2010. <>. </li></ul><ul><li>4.McCully, Patrick. &quot;Greenhouse Gas Emissions from Dams FAQ&quot;. International Rivers. 06/15/2010 <>. </li></ul><ul><li>5.Rosenberg, Matt . &quot;Nile River: Aswan High Dam Controls The Nile River.&quot; Geography. 27 Jul. 2009. 8 Jun. 2010. < specificplacesofinterest/a/nile.htm>. </li></ul><ul><li>6.&quot;Shasta Dam.&quot; Wikipedia: The Free Encyclopedia . 29 May. 2010. 15 Jun. 2010. <>. </li></ul><ul><li>7.&quot;SwissDams&quot;. International Commision on Large Dams. June 15, 2010. <>. </li></ul>