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

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posted on 2024-05-06, 17:04 authored by Jeremy Wright
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.

History

Language

eng

Degree

  • Master of Applied Science

Program

  • Environmental Applied Science and Management

Granting Institution

Ryerson University

LAC Thesis Type

  • Thesis

Thesis Advisor

Kristiina Mai

Year

2022

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    Environmental Applied Science and Management (Theses)

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