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Hoover Dam2


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Hoover Dam2

  1. 1. Hoover Dam Aim: To learn a case study for water management in an MEDC. Skill: To locate, describe and explain the Hoover dam
  2. 2. Starter: <ul><li>Using the map of the river Colorado basin (figure 3.67) describe the location of the Hoover Dam. </li></ul><ul><li>A) globally </li></ul><ul><li>B) regionally </li></ul>
  3. 3. Why was water transfer needed? <ul><li>Temperatures throughout the Colorado basin are high so water is lost through evaporation. </li></ul><ul><li>The basin relies on snow melt from the Rockies, which relies on precipitation. </li></ul><ul><li>The lower basin was liable to flooding. </li></ul><ul><li>Urbanisation and population growth in the SW. </li></ul><ul><li>Water needed for farming (cattle & irrigation). </li></ul><ul><li>Use the 1991/1998 population table to describe </li></ul><ul><li>how population has changed in the SW and why this has led to a need for water transfer. </li></ul>
  4. 4. Why was the area so suitable for a reservoir? <ul><li>The Colorado river flows across deeply dissected, level sandstone plateaus (canyons). </li></ul><ul><li>(Ever heard of the Grand Canyon?) </li></ul><ul><li>Canyons provide storage The underlying rocks are impervious and so less water would be lost through infiltration and percolation. </li></ul><ul><li>The Hoover dam was built in the Black Canyon, which is over is 221 m high and 379m long. </li></ul><ul><li>A narrow gorge so a narrow dam could be constructed therefore making the construction easier and cheaper. </li></ul><ul><li>The area is largely desert and therefore few people had to be moved to make way for the reservoir. </li></ul>
  5. 5. Hoover dam uses. <ul><li>Using figure 3.70, describe how the dam can be used. </li></ul>
  6. 6. The scheme <ul><li>The river is managed through state funded projects. </li></ul><ul><li>The Hoover dam was one of the first major schemes. </li></ul><ul><li>Its primary purpose was to control the flow of the river, supply irrigation and provide hydroelectric power (HEP), which was a way of paying for the huge costs </li></ul>
  7. 7. So who benefited from the scheme? <ul><li>Towns and farms benefit from irrigation. </li></ul><ul><li>Locals benefits from cheap electricity. </li></ul><ul><li>Urban areas can develop without fear of flooding. </li></ul><ul><li>Urban areas can develop in usually dry areas as they have a regular water supply e.g. Las Vegas. </li></ul><ul><li>Locals and tourists can use the lakes for recreation purposes. </li></ul><ul><li>Manufacturing industries and enables golf courses and gardens to thrive in areas where vegetation is normally very sparse </li></ul>
  8. 8. So who lost out from the scheme? <ul><li>Environmentalists and conversationalists who believe in the preservation of the wilderness in its original state. </li></ul><ul><li>Flora and fauna from the surrounding ecosystems. </li></ul><ul><li>Traditional Native Americans who live at sites along the river and are displaced. </li></ul><ul><li>Settlements downstream of the river receive increased erosion as sediment trapped in lakes scours the channel. </li></ul><ul><li>Using this information together with figure 3.75 explain </li></ul><ul><li>the issues that have arisen in the Colorado basin. </li></ul>
  9. 9. Using an example of a dam you have studies describe explain the arguments for and against human interference in river flow to try to control flooding? A) Locate the dam B) Describe and explain why a dam was needed C) Describe and explain the advantages, (why it was so suitable). D) Describe and explain the disadvantages, (why it cause problems) 8 marks
  10. 10. <ul><li>Follow the command word </li></ul><ul><li>Describe: </li></ul><ul><li>Say what you see using observations, ideas and data. </li></ul><ul><li>Explain: </li></ul><ul><li>Say how or why giving as many reasons as you can. </li></ul><ul><li>Underline key words and use specialist terms </li></ul><ul><li>Categorise into social environmental economic factors (SEE factors) </li></ul><ul><li>Talk about sustainability. </li></ul>
  11. 11. Mark Scheme <ul><li>Marked according to level of response. </li></ul><ul><li>Level 1 Well applied case study, simple description or explanation, information communicated through brief statements. (1-2) </li></ul><ul><li>Level 2 More detailed description and explanation. Communicates using a clear structure and begins to use specialist terms some errors in SPG. (3-4) </li></ul><ul><li>Level 3 Case study applied very well, provides a balanced account with specific description and explanation. (5-6) </li></ul><ul><li>Level 4 All of the above plus logical communication clear and well applied use of specialist terms very accurate SPG. (7-8) </li></ul>