Volume 3 - Program & Project Ideas (PDF - 4.5 - Natural Life Network

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Natural Resources Canada – Community Energy Systems • During the spring and summer, the average daily demand for space conditioning (heating, cooling) was reduced by over 75 per cent for the green roof. • The green roof reduced water runoff rate and volume. During rainfalls of 10mm in 12 hours, when the roof top garden became saturated with water, it retained 45 per cent of the rainwater, and reduced the runoff rate by 75 per cent. • Roof top gardens can preserve the roof and prolong its use by reducing heat aging and thermal stress. Typically the life of a roof is 15 to 20 years, while a green roof is expected to last 25-40 years. Source: The National Research Council. 2003. Evaluating Rooftop and Vertical Gardens as an Adaptation Strategy for Urban Areas (NRCC-46737). For environmental reasons, only electronic versions are available. http://irc.nrc-cnrc.gc.ca/fulltext/nrcc46737/ - Case study: Toronto, ON The Toronto Green Roof Infrastructure Demonstration Project has two demonstration sites: the publicly accessible City Hall Podium Roof and the roof of the Eastview Community Centre. There are eight garden plots on the City Hall roof; each test a different style of construction and maintenance of roof top gardens. The Eastview Neighbourhood Community Centre Green Roof Research site was launched September 2002. The Institute for Research in Construction, a branch of the Ottawa-based National Research Council, is measuring the impact of the projects, particularly on the heat island effect. Source: Green Roofs for Healthy Cities. Undated. Green Roof Demonstration Project. http://www.cardinalgroup.ca/grhcc/main.htm. For a virtual tour of the project see http://peck.ca/grhcc/. This case study will be highlighted in a document to be issued by the National Research Council. For information, contact Karen Liu, Tel: (613) 993-4585, fax: (613) 954-5984. E-mail: karen.liu@nrc-cnrc.gc.ca Draft 4/11/2005 88
Natural Resources Canada – Community Energy Systems Source: Green Roofs for Healthy Cities. Green Roof Demonstration Project featuring eight accessible plots on Toronto's City Hall. http://www.cardinalgroup.ca/grhcc/main.htm Boat-top gardens in Amsterdam, Holland Draft 4/11/2005 89
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Volume 3 - Program & Project Ideas (PDF - 4.5 - Natural Life Network

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