Technical report

Decision principles for the selection and placement of green infrastructure to mitigate urban hotspots and heat waves

Urban heat islands Climate change Green infrastructure Green roofs

Using green infrastructure to moderate high urban temperatures is increasingly a focus of city governments around the world. This is motivated by the negative health consequences of high urban temperatures as well as the threat of increasing frequencies of heatwave events under climate change predictions. Green infrastructure is an attractive method of mitigation because of the diverse additional benefits beyond temperature reductions it delivers to the community. There is as yet little guidance on how to effectively implement green infrastructure for the hot, dry summer conditions experienced in southeastern Australia.

This report presents a series of guiding principles for land managers at the Local Government Area level in Greater Melbourne for making decisions on how to most effectively implement green infrastructure to cool urban areas during summer daytime conditions. The decision principles are based on a review and synthesis of relevant sections of the green infrastructure literature and literature from urban climatology as well as novel data presented in Coutts and Harris (2012) A multi-scale assessment of urban heating in Melbourne during an extreme heat event and policy approaches for adaptation.

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