Chapter 6 Green roofs: 10 years after City of Toronto Green Roof Bylaw

Wright, Jeremy; Lytle, Jeremy; Amine, Hala Al; Hitesh, Doshi

doi:10.1515/9783110597820-006

Cited by 1 publication

(2 citation statements)

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“…The City of Toronto was the first North American city to utilize a mandatory green roof bylaw due to the persistent issues the city has faced from stormwater management (Wright, Lytle, Amine, & Doshi, 2021). Toronto has been experiencing severe stormwater issues dating back to 1954, where the city was devastated by the effects of Hurricane Hazel.…”

Section: Introductionmentioning

confidence: 99%

“…The target then might relate to a volume and distribution of green roof retention to offset the average volume of wastewater by-pass during extreme wet weather events. In this regard some progress has been made, but a more detailed analysis on the local stormwater dynamics would be required to assess the magnitude (Wright, Lytle, Amine, & Doshi, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Evapotranspiration Rates of Representative Green Roof Systems and the Implications for Green Roof Policies

Wright

2024

Preprint

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Urban intensification, population growth and climate change are creating multiple issues within cities on a global scale. As more buildings are constructed to support increasing urban populations, cities are having a more difficult time managing sporadic weather events; especially managing stormwater from intense rainfall. Toronto currently has in place a mandatory green roof bylaw, that is designed to utilize shallow green roofs (GRs) on all new buildings as a measure to intercept rainfall and transpire the water back into the atmosphere. Four green roof modules with varying system buildups were constructed and instrumented on top of a downtown building to analyze how the amounts of retained rainfall and evapotranspiration varied amongst the systems. It was determined that the total evapotranspiration (ET) volume of blue/green roofs and vegetable producing green roofs were considerably higher than a traditional extensive green roof; 236% higher in the blue/green roof and 356% higher in the vegetable roof. It was also determined that unvegetated blue roof systems are also a viable method of managing stormwater on rooftops, with the blue roof module showcasing a total evaporation volume of 134 mm over the duration of the study. The results from this research exhibit that higher hydrological benefit can be derived from green roofs using blue-green technology or vegetable producing assemblies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%