Like many other cities, the city of Worcester, MA is establishing policies and plans to promote climate change resiliency that effectively integrates environmental and ecological systems. Blue and green infrastructure are becoming critical elements of many of these plans, and there are important feedbacks between blue and green infrastructure for sustaining the benefits for urban communities. However, significant gaps remain in our understanding of the effects and potential benefits of blue-green infrastructure and their effectiveness in mitigating the effects of climate change and urbanization. This project was developed to establish an approach for developing blue green infrastructure to mitigate flooding and water quality impacts in a changing climate while incorporating stakeholder input. First, working with stakeholders, existing data were curated and missing data and gaps were identified. This included mapping of spatial variability in features of blue-green spaces (natural land areas, type and extent of green vegetation), grey spaces (impervious surface area), and physical features of the landscape, as well as identification of vulnerable populations to ensure data and policies are being made in equitable manner. Second, a targeted field study was completed in Worcester that allowed for an integrated approach to quantify the services provided by blue-green infrastructure as it pertains to stormwater mitigation and heat adaptation. Using the EPA’s Stormwater Management Model (SWMM), the impacts of storms on the urban environment were determine for current and future conditions with consideration to variability in contributions of blue-green infrastructure. An approach was developed to account for the increasing frequency and magnitude of precipitation events occurring with climate change, and to detail best management practices that combine blue and green infrastructure for managing stormwater while providing maximum benefits for the community. Effective use of both types is essential for reducing flooding and mitigating the impacts of stormwater runoff and heat adaptation.
