Damsornodams97 121009001230-phpapp01

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Damsornodams97 121009001230-phpapp01

  1. 1. Presented By : Talha Arfi Registration # 20090498
  2. 2. PRESENTATION SCHEME Why Dams? What is Dam? Types of Dams Uses Of Dams Dams-Statistics Impacts of Dams Conclusion
  3. 3. WHY DAMS? Water is essential for sustaining all life. Population movement and increase require water year round in remote areas. Water collection and utilization is important. Ability to sustain dough and dry situations.
  4. 4. WHAT IS DAM? A structure to contain water. A solid barrier constructed at a suitable location across a river valley. Has mechanically engineered structure to direct and control flow of water and storage.
  5. 5. TYPES OF DAMS Gravity Dam Buttress Dam Arch Dam Embankment Dam
  6. 6. USES OF DAMS Direct Water Usage Indirect Uses
  7. 7. DIRECT WATER USAGE Private/Domestic Commercial Irrigation Livestock Industrial Mining General Public Supply
  8. 8. INDIRECT USES Hydroelectric Power Flood Control Transportation
  9. 9. DAMS STATISTICS By the end of the 20th century , there were 45,000 large dams built in 150 countries . International Commission on Large Dams (ICOLD) Displacement of 4 million people annually due to dams. Approximately 1,700 dams are being built , at the cost of about 50 million dollars per year. 19% of electricity from hydro power-more than 50% in 63 countries. 12% of all dams have a water supply function. 75 countries have dams for flood control. Dam supports 30-40% of irrigated area and 12-16% of global food production. World Commission on Dams (WCD)
  10. 10. IMPACTS OF DAMS Environmental Impacts Sociological Impacts Economical Impacts Effects of Dams on Water Quality
  11. 11. Environmental Impacts River Pollution Erosion Loss of Aesthetic View Air Pollution Noise Pollution Dust
  12. 12. SOCIOLOGICAL IMPACTS Indigenous People Affected Loss of Ecosystems Loss of Species Displacement Of People
  13. 13. DISPLACEMENT OF PEOPLE BY DAMS
  14. 14. ECONOMICAL IMPACTS Agriculture Power Generation Water Supply Employment
  15. 15. EFFECTSON WATER QUALITY Change in Temperature Turbidity Dissolved Gas in the Water Eutrophication
  16. 16. CONCLUSION Small dams should be built instead of large dams Careful planning throughout the site selection , design and construction of dam is critical Sociological impacts should be considered along with the main objectives of water supply , power generation and flood control Economic incentives should be weighed against sociological impacts
  17. 17. QUESTION & ANSWERS SESSION

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