Flood protection

The Recreio green corridor project, launched in 2012 by the Municipal Secretariat for the Environment and several city departments, aims to protect and enhance the rich biodiversity and ecosystems of the area, to help with the resilience and adaptation of the west side of the city, an area affected by coastal flooding and erosion. The project mostly focused on preserving, connecting, and expanding the existing local urban nature elements and protecting their ecology. Lastly, the project also aimed to educate the residents about native vegetation and help build social interaction and cohesion between the local communities [Ref 1]. The project was designed to preserve and connect 320.76 ha of protected areas and add 60.73 ha of open public spaces and squares. And in total, the corridor has a linear extension of close to 8 kilometers, passing through very diverse urban areas (Ref. 7), including natural parks, a lagoon system, water canals, and social housing areas.

Two River Urban Park is a public space located towards the confluence of the Liesbeek and Black Rivers and is one of the largest urban green lungs in the City of Cape Town. It is approximately 240 hectares in extent. The Park comprises sensitive ecological systems and habitats, extensive open space areas, institutions, historical buildings and cultural landscapes (2). The City of Cape Town and the Western Cape Province own significant proportions of the park and in 2011, the Western Cape Government started considering the sustainable redevelopment of the TRU Park into a mixed-used urban green area including housing development, heritage protection, the rehabilitation of the degraded environment and recreation opportunity creation (1). Since 2016, the project has been on hold due to the modification of the planning law Local Spatial Development Framework that affects the redevelopment plans of the Two Rivers Urban Park (1).

The City of Melbourne, through its Urban Forest Strategy, has a comprehensive plan for greening major streets and precincts, but not the smaller laneways. Across the municipality, laneways occupy a ground area of 60 hectares, with a further 150 hectares of space on the walls in these laneways (3). "The City of Melbourne has established the GYL program in 2016 with the vision to help transform the city’s smaller laneways into leafy, green and better usable spaces for the residents and other visitors to enjoy while addressing the city’s sustainability challenges." (1 p27). So far, a pilot project has been carried our including the transformation of 4 laneways: Coromandel Place, Guildford Lane, Meyers Place and Katherine Place (1,3). The intervention included an intensive planning process with the involvement of stakeholders from the private and public sectors and the creation of an interactive map of laneways ideal for greening. (1,2). The GYL program aims to address the issues of urban heat islands, climate change impacts of flood mitigation while also improving local aesthetics, amenity and creating opportunities for recreation (1).

The Climate Adaptation Strategy (CAS) was approved in 2016 and it includes various measures that aim to address various urban challenges (e.g. temperature rise, heat waves, heavy rainfalls, flooding)(Ref. 1, 2). The CAS is considered a key instrument for integrating green and blue measures in comprehensive planning.
Here, the NBS is presented with a focus on two specific measures: (Reference 1) Integration of the Urban Climate Map in urban planning, focusing on the preservation of existing air corridors/channels through open green spaces. (Reference 2) Integration of other climate adaptation measures in urban planning instruments through open green areas, community rooftop gardens, trees, and water elements. (Reference 1)

In 2014 a counselling office of the NGO Green City was established, entitled The Greening Office (Begrünungsbüro), with the objective of better engaging citizens in green adaptation measures, such as green roofs, green façades, green walls or green courtyards (Reference 1, 5). Financed by the City’s Department of Health and Environment, the project addresses climate change adaptation through greening private properties, achieved through counselling citizens and companies, with diverse outreach and networking activities. The NBS recognised the potential of the many unused private spaces, such as south-facing facades and flat roofs to better adapt to climate change across the entire city (Reference 1).

Parc Marianne is an ecodistrict that aims to address multiple challenges such as climate action for adaptation, environmental quality, flooding, and in response to the high population growth in Montpellier. Parc Marianne is connected to public transportation, has bicycle lanes and car parks, and the sidewalk is shared between pedestrians and bicyclists and structured with trees and other greenery. The park was certified with the ecodistrict label in 2015 following requirements like environmental sustainability, thermal performance, quality of life, nature and biodiversity, and mobility (Ref. 1). Parc Marianne is a mixed neighbourhood with an ability to combine city and nature, quality of life and centrality (Ref. 2).

The creation of pocket parks is an urban initiative that has steadily grown throughout Budapest since 2010 (Reference 1). Most of these projects are citizen-led, but there is often support provided in the form of education and consultancy by initiatives such as the Contemporary Architecture Center (KÉK), or sometimes the local government (Reference 8). These spaces, typically covering an area of 1400 square meters only, are multi-functional and provide a space for small-scale food production, recreation, community sharing, and can be a fundamental element of neighbourhood rehabilitation. Moreover, it provides positive environmental effects such as water retention and the improvement of the area's micro-climate. Pocket-parks are critical in increasing the number of green areas in neighbourhoods that have limited space. (Reference 9)

The Gorla Maggiore water park, inaugurated in March 2013, is situated within the municipality of Gorla Maggiore, in the Italian region Lombardy, located about 30 kilometers northwest of Milan. The water park is a constructed wetlands (CW) built on the banks of the Olona river that includes (a) a pollutant removal area composed of a grid, a sedimentation tank and four vertical sub-surface flow constructed wetlands; (b) a multipurpose area with a surface flow constructed wetland or pond with multiple roles; and (c) a recreational park with restored riparian trees, green open space, walking and cycling paths. [1]

The Lama Balice Nature Park is located near a long 'lama', which is a deep karst gorge, located north of the city of Bari. Established in an abandoned site, the nature park protects the area of the riverbed in the periphery of the city, acting as a natural channel for regulating water flow. It also serves as a recreational and cultural hub, while conserving agricultural functions and maintaining biodiversity. An administrative body consisting of the participating local mayors has been set up to manage the protected area. [1][2]

A local government-led project of the renaturalization of the part of the Weser river shore. The initiative aimed to restore part of the river bank to its natural state and to create habitats for the typical local flora and fauna. Additionally, a sand beach for the public was created. The project aimed to increase biodiversity, increase the river shore protection and water management, as well as to improve public access to the recreational area at the water and the attractiveness of the river landscape (Ref. 1, 2, 5).