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Semelhante a WWMLeung 2014 Feb10 - eces - engineer's perspective of green roofs
Semelhante a WWMLeung 2014 Feb10 - eces - engineer's perspective of green roofs (20)
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WWMLeung 2014 Feb10 - eces - engineer's perspective of green roofs
- 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. Green Roofs: Engineer’s Perspective Early Example
- 3. Green Roofs: Engineer’s Perspective Recent Example
- 4. Green Roofs: Engineer’s Perspective Fit For Purpose Durable Practical Safe
- 5. Green Roofs: Engineer’s Perspective Fit For Purpose Why Green ?
- 6. Green Roofs: Engineer’s Perspective Fit For Purpose Why Green ? How Green ?
- 7. Green Roofs: Engineer’s Perspective Fit For Purpose Why Green ? How Green ? Who Knows ?
- 8. Green Roofs: Engineer’s Perspective Durable Strength Stability
- 9. Green Roofs: Engineer’s Perspective Durable Strength Stability Building Envelope
- 10. Green Roofs: Engineer’s Perspective Durable Strength Stability Building Envelope Performance
- 11. Green Roofs: Engineer’s Perspective Durable Strength & Stability Building Envelope Performance Reparable
- 12. Green Roofs: Engineer’s Perspective Practical Accessible
- 13. Green Roofs: Engineer’s Perspective Practical Accessible Usable
- 14. Green Roofs: Engineer’s Perspective Practical Accessible Usable Feasible
- 15. Green Roofs: Engineer’s Perspective Practical Accessible Usable Feasible Optimal
- 16. Green Roofs: Engineer’s Perspective Safe Fall Prevention
- 17. Green Roofs: Engineer’s Perspective Safe Fall Prevention Secure
- 18. Green Roofs: Engineer’s Perspective Safe Fall Prevention Secure Wind-proof
- 19. Green Roofs: Engineer’s Perspective Safe Fall Prevention Secure Wind-proof Fire-proof
- 20. Green Roofs: Engineer’s Perspective Fit For Purpose Durable Practical Safe
- 21. Slowing Down On Green Roofs Peak Flow Attenuation and Volume Reduction Engage. Innovate. Inspire.
- 22. Slowing Down On Green Roofs Peak Flow Attenuation Or With Green Roof Source: www.ec.gc. ca Engage. Innovate. Inspire.
- 23. Slowing Down On Green Roofs Volume Reduction Source: environmentalsciencesociety. org Engage. Innovate. Inspire.
- 24. Slowing Down On Blue Roof Source: www.perviouspavement. org Source: Alumasc Engage. Innovate. Inspire.
- 25. Slowing Down On Blue Roof Source: www.perviouspavement. org DETENTION AND EVAPORATION OFFERED BY BLUE ROOFS Engage. Innovate. Inspire.
- 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. 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. 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. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration. . . Source: www.princeton. edu Engage. Innovate. Inspire.
- 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. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention Engage. Innovate. Inspire. Source:environmentalsciencesociety. org
- 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. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention Engage. Source: enr.construction. com Innovate. Inspire.
- 34. Slowing Down On Green Roofs Green Roof: detention, evaporation, infiltration, percolation, evapotranspiration, retention Engage. Innovate. Source: enr.construction. com Inspire.
- 35. Slowing Down On Green Roofs Source: prairieecosystems.pbworks. com Engage. Innovate. Inspire.
- 36. Slowing Down On Green Roofs Green Roofs: with cisterns or harvesting Source: www.ce.t.kyoto-u.ac. jp Engage. Innovate. Inspire.
- 37. Slowing Down On Green Roofs Source: nusdeltares. org Engage. Innovate. Inspire.
- 38. Slowing Down On Green Roofs Green Roof: Effects of Rain Duration & Intensities Source: uregina. ca (modified) Engage. Innovate. Inspire.
- 39. Slowing Down On Green Roofs Green Roof: Runoff Quality & Pollution Control Source: www.lid-stormwater. net Engage. Innovate. Inspire.
- 40. Slowing Down On Green Roofs Engage. Innovate. Inspire.
- 41. Slowing Down On Green Roofs Engage. Innovate. Inspire.
- 42. Slowing Down On Green Roofs Engage. Innovate. Inspire.
- 43. Slowing Down On Green Roofs Impact of Green Roofs on Urban Catchment Engage. Innovate. Inspire.
- 44. Slowing Down On Green Roofs Engage. Innovate. Inspire.
- 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
Notas do Editor
- Key factors for illustration: Chicago, wind capital, early green roof, 2000, older building, mechanical equipment, heat, moisture/icy mist, . . . A garland of nature crowns Chicago's City Hall, softening the hard edges of a town famous for steel and stone—and lowering summer temperatures on the roof. Inspired by a worldwide movement, Mayor Richard Daley has made Chicago North America's leading "green roofs" city.City Hall's Rooftop GardenChicago’s most famous rooftop garden sits atop City Hall, an 11-story office building in the Loop. City Hall and the adjacent Cook County building appear to most people as one building spanning a city block bounded by LaSalle, Randolph, Clark and Washington streets. First planted in 2000, the City Hall rooftop garden was conceived as a demonstration project - part of the City's Urban Heat Island Initiative - to test the benefits of green roofs and how they affect temperature and air quality. The garden consists of 20,000 plants of more than 150 species, including shrubs, vines and two trees. The plants were selected for their ability to thrive in the conditions on the roof, which is exposed to the sun and can be windy and arid. Most are prairie plants native to the Chicago region.Like all green roofs, the City Hall rooftop garden improves air quality, conserves energy, reduces stormwater runoff and helps lessen the urban heat island effect. The garden's plants reflect heat, provide shade and help cool the surrounding air through evapotranspiration, which occurs when plants secrete or "transpire" water through pores in their leaves. The water draws heat as it evaporates, cooling the air in the process. Plants also filter the air, which improves air quality by using excess carbon dioxide to produce oxygen.The rooftop garden mitigates the urban heat island effect by replacing what was a ballasted, black tar roof with green plants. The garden absorbs less heat from the sun than the tar roof, keeping City Hall cooler in summer and requiring less energy for air conditioning. The garden also absorbs and uses rain water. It can retain 75% of a 1 inch rainfall before there is stormwater runoff into the sewers.
- Williams’ old office building – our learning experience
- Our latest project with Amer Jordan Architects “Living Roofs Business Centre”We’ll come back to these two examples at the end.
- Fish ? River ? Food ? Habitat ? Energy ? Urban Landscape ? Flood Control ?
- Fish ? River ? Food ? Habitat ? Energy ? Urban Landscape ? Flood Control ?
- To whose Standard ? Accountable to whom ? In the long run ?
- New Building ? Existing Building ? Architectural Form ? Building Movements ?Wet/dry conditions.
- Waterproofing, Thermal properties, Material Elasticity & Durability
- Energy, Stormwater, water harvesting, water quality, maintenance, green-ness.
- Life span & life cycle, less durable covering more durable, renewal.
- For whom ?
- Dependable & hence sustainable ?
- $, weather, neighbours, compatible useConditions: sun, shade, wind, neighbour
- Combinations & PermutationsCollaboration with architects, landscape architectsUse of excess redundancies – an art rather than a science
- Barriers Public ? Occupants ? Educational ? Maintenance only ?
- How vulnerable to damage ? Access ? Flying/falling objects ? Cigarette butts?Vandalism ?
- Parapets, plant selectionLots of research info coming from Canada (Ottawa) and US (hurricane country)
- Parapets, pavers, material,plant selectionImpact of a fire event on green roof movement
- Waterproofing, Thermal properties, Material Elasticity & Durability
- Waterproofing, Thermal properties, Material Elasticity & Durability