An overview of the findings of green roof mapping in Vancouver, BC. As noted in the article, GRIN was established when BCIT's roof programming ended. Almost 20 years ago (!) we worked with the Capital Regional District and Next Level Stormwater Management to install, in part, intensive and extensive green roofs covering 670m2 at their Victoria headquarters. The largest extensive roof was monitored by BCIT for two years (it was the first pilot test centre on Vancouver Island) and researchers found that the green roof retained 36% of rainfall with peak runoff flow reduced by over 90% and delayed by nearly 2 hours. My guess is that we, like Vancouver, do not have enough green roofs for benefits beyond building scale. It would be very interesting to see a retrofit analysis done for Greater Victoria and explore how increased green roof incentivization across municipalities could work in tandem with, for example, existing urban canopy initiatives for a region-wide approach to urban heat and stormwater management. City of Victoria Councilors did vote at the beginning of 2024 to explore reducing barriers to building green roofs so there is already some momentum. https://lnkd.in/g_qQsVGe
this is a follow up to a comment I made the other day about the sophisticated mapping we have been up to in Vancouver and why we need it to support policy action that ensures, with no excuses, integrated blue/green infrastructure and nature positive actions for every new and every renovation project. Everywhere.... @ChristineThuring @Gentian @DustyGedge @DanWhite https://lnkd.in/gyQKQJaD