Nature-based solutions (NbS) have revolutionized urban planning, offering multifunctional approaches that go beyond aesthetics and which can address climate change, enhance livability, and achieve sustainable and resilient urban environments. After five years of exploration, experimentation, and reflection in the CLEVER Cities project, we have identified key principles for effective NbS planning. These principles will guide informed decision-making and help to unlock the potential of NbS in interested cities.
Traditional urban planning sometimes neglects the crucial aspects of territorial planning and geography. However, when incorporating NbS, this comprehensive approach becomes essential. The integration of NbS with existing natural spaces both within and outside the city is vital for effective planning. It is thus advisable to initiate projects by defining NbS specifications on a macro-scale, considering the larger context. Conversely, the functionality of NbS relies heavily on the intricacies of design and implementation. Paying attention to micro-scale details such as plant species, their sizes, substrate thickness, and filtration systems becomes paramount when designing and sizing urban interventions. These nuanced factors significantly contribute to the success of NbS implementations.
The intricate functioning of ecosystems - compounded by the interactions between urban and natural environments - requires the expertise of specialists who can unravel their intricate mechanisms. By incorporating this understanding, we can effectively build on the principles of ‘traditional’ urban planning. An intriguing approach involves utilizing existing ecosystems or envisioning potential ecosystems as a foundation for planning, subsequently developing projects centered around the ecosystem services that can be harnessed from the local environment.
A fundamental aspect of incorporating NbS into urban projects is their dynamic and living nature. It is crucial to consider the temporal dynamics associated with these solutions, including seasonality, installation time of plants, and long-term evolution, to fully leverage their capacity to provide ecosystem services. This analysis needs to be balanced with urban functional requirements while anticipating maintenance needs. Additionally, monitoring the implemented solutions is valuable for generating local collective learning based on factual data, facilitating a "learn by doing" approach.
The IUCN standard for NbS emphasizes the crucial involvement of local stakeholders in the planning process. Specifically, attention must be given to the site users and individuals with direct engagement in the urban project. CLEVER Cities has had a rewarding experience in this aspect, implementing diverse co-creation techniques that have effectively added a valuable social dimension to local projects. These participatory processes are particularly significant in NbS planning, as they empower local stakeholders to take ownership of the solutions, contributing to the long-term success of the initiatives.
NbS planning offers the opportunity to integrate existing natural remnants that are little known or disconnected, whether from the rest of the neighboring natural environment or from the city itself. Working on these connections often proves to be highly effective and a source of multiplier effects in terms of the environmental and social impacts generated.
Involving different departments of the municipality at the early-stages of the process, so that they are aware of the activities, objectives, needed contributions, fostering an active collaboration.
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