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Impacts of High-Voltage Power Transmission Lines Project

This is presentation about impacts of high-voltage power transmission Lines Project. All impact can be face in construction or after construction. EIA report can be apply this impacts.

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Impacts of High-Voltage Power Transmission Lines Project

  1. 1. Welcome 8 March 2016 1
  2. 2. Ma Nandar Nwe Dip.EIA/EMS (2) Mining Engineering Department, YTU 8 March 2016 2
  3. 3. Types of Environmental Impacts Found in Transmission Projects • Agricultural Lands Impacts • Forest Impacts (WoodLands) • Wetland and Riparian Impacts • Biodiversity Impacts • Safety and Public Health • Electromagnetic Fields (EMF) • Cultural Sites • Aesthetic Impacts • Resettlement 8 March 2016 3
  4. 4. Agricultural Lands Impacts • impacts depend on the transmission line design and the type of farming • Increase soil erosion by requiring the removal of windbreaks that were planted along field edges or between fields • Create opportunities for weed and other pest encroachment • Compact soils and damage drain tiles • Hinder or prevent aerial spraying or seeding activities by planes or helicopters 8 March 2016 4
  5. 5. Mitigation of Agricultural Impacts • Avoid or minimize construction; • Identify, address, and document concerns before construction begins; • Find resolutions for anticipated impacts 8 March 2016 5
  6. 6. 8 March 2016 6 Forest Impacts (Woodland) • the permanent removal of woody vegetation • bare land or land covered by completely different vegetation communities
  7. 7. Mitigation of Impacts to Woodlands Impacts to woodlands can be minimized by a variety of methods. Example methods include: • Avoiding routes that fragment major forest blocks; • Adjusting pole placement and span length to minimize the need for tree removal and trimming along forest edges; • Allowing tree and shrub species that reach heights of 12 to 15 feet to grow within the Right of Way(ROW); 8 March 2016 7
  8. 8. 8 March 2016 8 • Heavy machinery can crush wetland vegetation; • Wetland soils, especially very peaty soils can be easily compacted, increasing runoff, blocking flows, and greatly reducing the wetland’s water holding capacity; • The construction of access roads can change the quantity or direction of water flow, causing permanent damage to wetland soils and vegetation; Wetland and Riparian Impacts
  9. 9. Mitigation of Impacts to Wetlands • Avoid placing transmission lines through wetlands • Limit construction to winter months when soil and water are more likely to be frozen and vegetation is dormant; • Use mats; • Use alternative construction equipment such as helicopters; 8 March 2016 9
  10. 10. • can affect biodiversity in many ways, including habitat conversion and fragmentation, pesticide use and construction roads • For Example: trees used by birds for nesting might be cut down or soil erosion may degrade rivers and wetlands that provide required habitat 8 March 2016 10 Biodiversity Impacts
  11. 11. Mitigation of Impacts to Biodiversity • Doing preliminary research and field assessments • the design of the transmission line, • reducing the workspace at a particular location, • employing special construction techniques, or limiting construction activities to specific seasons. 8 March 2016 11
  12. 12. Safety and Public Health • a risk of electrocution to the public • by direct contact with high voltage equipment and lines, and also by induced voltages • Humans and farm animals can also risk electrocution or nuisance shock 8 March 2016 12
  13. 13. Occupational Health and Safety Monitoring • Transmission lines must meet the requirements of the international standard • built with a grounded shield wire placed along the top of the poles, above the conductors • Monitoring should be design and implemented by professionals • Maintain a record of accidents and diseases 8 March 2016 13
  14. 14. 8 March 2016 14 Electric and Magnetic Fields (EMF) • The effects (EMF) on humans are scientifically uncertain at this point • health effects, including childhood leukemia and miscarriage, others • But there is no data demonstrating adverse health effects
  15. 15. Reducing Magnetic Field from Transmission Lines • to bring the lines (conductors) closer together • Use of underground cable, especially in populated areas. • Identification of potential exposure levels in the workplace • Establishment and identification of safety zone 8 March 2016 15
  16. 16. • can affect cultural sites such as areas of archaeological, historical, or religious significance • Burial sites and buried artifacts may be disturbed • can damage sites by digging, using heavy equipment, uprooting trees, by making the sites more accessible to vandal 8 March 2016 16 Cultural Sites
  17. 17. Mitigation of Cultural Impacts • If during construction an archeological site is encountered, construction at the site is stopped • makes recommendations from related organizations on how construction should proceed 8 March 2016 17
  18. 18. 8 March 2016 18 Aesthetic Impacts Aesthetic impacts depend on: • The physical relationship of the viewer and the transmission line (distance and sight line); • The activity of the viewer (e.g., living in the area, driving through); A transmission line can affect aesthetics by: • Removing a resource, such as clearing fencerows; • Degrading the surrounding environment (e.g., intruding on the view of a landscape); • Changing the context of the view shed (e.g., evoking an image of development in a previously rural area).
  19. 19. Mitigation of Aesthetic Impacts • to avoid areas considered scenic • The form, color, or texture of a line can be modified to somewhat minimize aesthetic impacts 8 March 2016 19
  20. 20. Resettlement • removal of people living in project locations • socially and economically disruptive to the people affected 8 March 2016 20
  21. 21. Resettlement Plans and Compensation Plan • must adhere strictly to due process of the relevant laws in each country, as well as to international guidelines • Other economic losses :for example, lost agricultural production, lost of land or farm 8 March 2016 21
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  23. 23. The Role of the Public Service Commission An applicant must receive a Certificate of Pubic Convenience and Necessity (CPCN) from the Commission for transmission line projects that are either: • 345 kV or greater; or, • Less than 345 kV but greater than or equal to 100 kV, over one mile in length, review process includes a public hearing in the affected project area. 8 March 2016 23
  24. 24. ADB Environmental Assessment Requirements for Transmission Projects • Category A: An environmental impact assessment (EIA) is required • Category B: An initial environmental examination (IEE) is required • Category C:. No EIA or IEE is required, although environmental implications are still reviewed In general, power transmission projects are assigned to Category B. 8 March 2016 24
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  27. 27. Conclusion • described the main types of environmental impact encountered in electricity transmission projects; • Can prevent necessary case in construction time and future; • Can get many help from international organization; 8 March 2016 27
  28. 28. References • International Best Practices for Assessing and Reducing the • Environmental Impacts of High-Voltage Transmission Lines • http://www.powerconsumer.com/2015/05/understanding- the-power-system/ • Environmental, Health, and Safety Guidelines for Electric Power Transmission and Distribution • IFC Performance Standards on Environmental and Social Sustainability 8 March 2016 28
  29. 29. Thank You! 8 March 2016 29

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