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WWMLeung 2014 Feb10 - eces - engineer's perspective of green roofs

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WWMLeung 2014 Feb10 - eces - engineer's perspective of green roofs

  1. 1. Green Roofs: Engineer’s Perspective NG Live!: Diane Cook & Len Jenshel: Gardens by Night . Up on the Roof A lofty idea is blossoming in cities around the world, where acres of potential green space lie overhead.
  2. 2. Green Roofs: Engineer’s Perspective Early Example
  3. 3. Green Roofs: Engineer’s Perspective Recent Example
  4. 4. Green Roofs: Engineer’s Perspective Fit For Purpose Durable Practical Safe
  5. 5. Green Roofs: Engineer’s Perspective Fit For Purpose Why Green ?
  6. 6. Green Roofs: Engineer’s Perspective Fit For Purpose Why Green ? How Green ?
  7. 7. Green Roofs: Engineer’s Perspective Fit For Purpose Why Green ? How Green ? Who Knows ?
  8. 8. Green Roofs: Engineer’s Perspective Durable Strength Stability
  9. 9. Green Roofs: Engineer’s Perspective Durable Strength Stability Building Envelope
  10. 10. Green Roofs: Engineer’s Perspective Durable Strength Stability Building Envelope Performance
  11. 11. Green Roofs: Engineer’s Perspective Durable Strength & Stability Building Envelope Performance Reparable
  12. 12. Green Roofs: Engineer’s Perspective Practical Accessible
  13. 13. Green Roofs: Engineer’s Perspective Practical Accessible Usable
  14. 14. Green Roofs: Engineer’s Perspective Practical Accessible Usable Feasible
  15. 15. Green Roofs: Engineer’s Perspective Practical Accessible Usable Feasible Optimal
  16. 16. Green Roofs: Engineer’s Perspective Safe Fall Prevention
  17. 17. Green Roofs: Engineer’s Perspective Safe Fall Prevention Secure
  18. 18. Green Roofs: Engineer’s Perspective Safe Fall Prevention Secure Wind-proof
  19. 19. Green Roofs: Engineer’s Perspective Safe Fall Prevention Secure Wind-proof Fire-proof
  20. 20. Green Roofs: Engineer’s Perspective Fit For Purpose Durable Practical Safe
  21. 21. Slowing Down On Green Roofs Peak Flow Attenuation and Volume Reduction Engage. Innovate. Inspire.
  22. 22. Slowing Down On Green Roofs Peak Flow Attenuation Or With Green Roof Source: www.ec.gc. ca Engage. Innovate. Inspire.
  23. 23. Slowing Down On Green Roofs Volume Reduction Source: environmentalsciencesociety. org Engage. Innovate. Inspire.
  24. 24. Slowing Down On Blue Roof Source: www.perviouspavement. org Source: Alumasc Engage. Innovate. Inspire.
  25. 25. Slowing Down On Blue Roof Source: www.perviouspavement. org DETENTION AND EVAPORATION OFFERED BY BLUE ROOFS Engage. Innovate. Inspire.
  26. 26. Slowing Down On Green Roofs Green Roof: Types Source: www.wbdg. org Source: www.salinitymanagement. org INTENSIVE SEMI-INTENSIVE EXTENSIVE Intensive : > 8”, $$$$$ Extensive: 2” – 8”, $$, 17 – 50 lbs/sf Built-up or Tray Systems Engage. Innovate. Inspire.
  27. 27. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, . . . Water designed to flow through medium vertically before laterally along drainage layer. VEGETATION GROWING MEDIUM FILTER / ROOT BARRIER DRAINAGE INSULATION WATERPROOFING STRUCTURE Source: www.greenroofplan. com Engage. Innovate. Source: environmentalsciencesociety. org Inspire.
  28. 28. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, . . . Water designed to flow through medium vertically before laterally along drainage layer. Special design considerations needed when designing a pitched green roof to preserve hydrological benefits of green roof. Source: www.hydrotechusa. com Engage. environmentalsciencesociety. org Source: Innovate. Inspire.
  29. 29. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration. . . Source: www.princeton. edu Engage. Innovate. Inspire.
  30. 30. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention Source: Paul MJ & Meyer JL, and USEPA Engage. Innovate. Inspire.
  31. 31. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention Engage. Innovate. Inspire. Source:environmentalsciencesociety. org
  32. 32. Slowing Down On Green Roofs Source: Hydrological performance of extensive green roofs in New York City: observations and multi-year modeling of Engage. three full-scale systems. T B Carson et al 2013 Environ. Res. Lett. 8 024036 doi:10.1088/1748-9326/8/2/024036 Innovate. Inspire.
  33. 33. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention Engage. Source: enr.construction. com Innovate. Inspire.
  34. 34. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention Engage. Innovate. Source: enr.construction. com Inspire.
  35. 35. Slowing Down On Green Roofs Source: prairieecosystems.pbworks. com Engage. Innovate. Inspire.
  36. 36. Slowing Down On Green Roofs Green Roofs: with cisterns or harvesting Source: www.ce.t.kyoto-u.ac. jp Engage. Innovate. Inspire.
  37. 37. Slowing Down On Green Roofs Source: nusdeltares. org Engage. Innovate. Inspire.
  38. 38. Slowing Down On Green Roofs Green Roof: Effects of Rain Duration & Intensities Source: uregina. ca (modified) Engage. Innovate. Inspire.
  39. 39. Slowing Down On Green Roofs Green Roof: Runoff Quality & Pollution Control Source: www.lid-stormwater. net Engage. Innovate. Inspire.
  40. 40. Slowing Down On Green Roofs Engage. Innovate. Inspire.
  41. 41. Slowing Down On Green Roofs Engage. Innovate. Inspire.
  42. 42. Slowing Down On Green Roofs Engage. Innovate. Inspire.
  43. 43. Slowing Down On Green Roofs Impact of Green Roofs on Urban Catchment Engage. Innovate. Inspire.
  44. 44. Slowing Down On Green Roofs Engage. Innovate. Inspire.
  45. 45. THANK YOU Williams Engineering Canada Inc. Inquiries: Williams Engineering Canada BUILDEX Calgary, November 6, 2013 Wilma Leung C.Eng., MICE,LEED-AP Email: wleung@williamsengineering.com

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