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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.
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.
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
Editor's Notes
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.
