Blue-Green infrastructure (BGI) is recognised internationally as an approach for managing urban water challenges while enhancing society and the environment through the provision of multiple co-benefits. This research employed an online survey to investigate the perceptions of BGI held by professional stakeholders in four cities with established BGI programs: Newcastle (UK), Ningbo (China), Portland (Oregon USA), and Rotterdam (Netherlands) (64 respondents). The results show that challenges associated with having too much water (e.g., pluvial and fluvial flood risk, water quality deterioration) are driving urban water management agendas. Perceptions of governance drivers for BGI implementation, BGI leaders, and strategies for improving BGI uptake, are markedly different in the four cities reflecting the varied local, regional and national responsibilities for BGI implementation. In addition to managing urban water, BGI is universally valued for its positive impact on residents’ quality of life; however, a transformative change in policy and practice towards truly multifunctional infrastructure is needed to optimise the delivery of multiple BGI benefits to address each city’s priorities and strategic objectives. Changes needed to improve BGI uptake, e.g., increasing the awareness of policy-makers to multifunctional BGI, has international relevance for other cities on their journeys to sustainable blue-green futures.

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Abstract:The Rebuild by Design (RBD) competition was launched after the devastating impact of Hurricane Sandy, and the winning designs have put a significant emphasis on green infrastructure (GI) as a means of achieving flood resilience in urban areas. Previous research in the field of urban stormwater management indicates that wide-spread implementation of GI remains a challenge, largely due to a lack of understanding of the required governance approaches. Therefore, by using a case study of Hoboken, for which the winning design was developed, this paper explores whether RBD provides governance structures and processes needed for the uptake of GI. Semi-structured interviews and desk study provided the data for an analysis of the presence of factors for supporting the transformative governance needed to facilitate the uptake of innovative solutions. Results indicate that RBD brought a greater change in terms of governance processes when compared to governance structures. In Hoboken, RBD created a narrative for long-term change, put GI as a preferred solution for tackling multiple challenges, and strengthened the local political buy-in. However, pitfalls were observed, such as limited funding provision, lack of regulatory compliance, economic justification and large investments required from public and private parties. The absence of these factors can hinder the overall uptake of the GI solution. Even though the design competition presents a novel approach to the field of resilience development, further steps should be made in understanding how the RBD methodology can be adjusted to provide results of equal quality in different settings (e.g., less developed regions, different governance contexts).

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This supplemental material describes the design and costing of the rainwater harvesting and supply systems. Figure 1 shows the basic elements of the system and the associated Tables 1-4 show the specific dimensions and capacities of each infrastructure item. The tables give an

Water introduces both opportunities and risks to urban areas. Society is faced with the challenge of finding solutions to complex and interrelated problems such as living safely in densely populated deltas, planning ahead for climate change, finding alternatives to fossil fuels, and urban redevelopment. We need to make sure that all this is achieved in a sustainable way. This paper elaborates on the need to transition towards water-sensitive cities, drawing on the experience of urban water management and water-sensitive urban design in the Netherlands and the UK. This transition involves strengthening the integration of water in spatial planning and design processes, requiring any spatial intervention or new development to be evaluated on opportunities for sustainability and innovation. Design tools or building blocks are suggested that enable the transition to a city in which the awareness of water, energy, nature and living environment are connected, in which developments always take place in a resilient and climate-proof way, and where water can be a focus for enjoyment and vitality. The paper concludes with recommendations on how the UK can build on its own experience and learn from the Netherlands to achieve more water-sensitive urban design.

Over 80% of cities have been built next to rivers, which in turn have become polluted and prone to overtopping their banks. Many cities are also subject to coastal flooding. As this paper describes, water challenges in urban areas include contamination of water sources, lack of potable water supply, sanitation, solid waste management, storm water floods, subsidence, environmental impact and diseases. Dealing with these issues – plus climate change and ongoing urbanisation – calls for innovative ideas when planning for water in the development of urban areas.

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