Water management (SDG 6)

Excess rainwater in sewers causes flooding and the overflow spills into the rivers. Rainwater spilling across pavements can also make for an unpleasant walking experience in the city. Dublin City Council, in collaboration with residents, ran a trial use of Rain Box Planters as a way of both greening the streets and better managing rainwater coming from roofs. The Rain Box Planters were placed below houses’ gutters in order to slow the torrent of water entering the drain. The first trials were successful and the next stage is to test them on a larger scale. (ref 2, 3)

Owing to European Funds, the University of Białystok opened a new modern ecological campus for the faculties of biology, mathematics and computer science. The new campus was designed to incorporate green and blue infrastructure elements, and embody the pro-ecological profile of the investment. Green vegetation covers the university's walls and roofs, which is nearly half of the 30,000 square meters big campus. There is a brook around buildings and small ponds in the university's inner courtyards. The campus uses a sustainable rain drainage system, which is located on the roof, and the rainwater flows to the artificial water tanks and is continuously filtered and redistributed. Finally, there is a publicly accessible centre for ecological education. Large decorative installations on each of the four courtyards enhance the aesthetic experience in the campus and inspire the faculty and students [1,2].

The project revitalized two old ponds – previous industrial and derelict area – and created two new ponds on the Marczukowska street in the city of Bialystok. The investment in its current shape is a tourist attraction and a valuable ecosystem for birds and amphibians. The project resulted in the increase of biodiversity in the area (additional ponds for the breeding of amphibians, two nesting islands not accessible to the public), and more effective management of the local water resources (cleaning and deepening of ponds, restoring an outflow for the excess water directly to the Biała river). Finally, it is a popular place with publicly open educational trails and bicycle paths [2,3,4].

The lake, which is fed by brook Rio Archetti, is located in the highest section of the park, immediately down from the Villa Doria camping ground, in an area of the public park that is not very frequented. It used to be in great decline, because of many maintenance and environmental factors. This intervention brought it back to its original estate, recreating the original historical and natural value the area had, highly popular among local residents as a green place where to enjoy calm and silence in the center of the city. (1,2)

As part of the Fifth Dimension research program of the University of Helsinki that examines green roofs from the perspectives of biodiversity and the three dimensions of sustainable development (ecological, social and economical sustainability), 8 green roofs were installed in Helsinki. The aim was to find economically viable solutions that are applicable to Helsinki’s and Finland’s conditions. The project experimented with green roofs in different parts of the country, over half of which are in Helsinki (ref. 1, 2, 3).

Situated on an area of 52 acres, Father Collins Park incorporates many sustainability-focused features and has won a number of awards. Over 1200 trees and 2000 native saplings were planted to help integrate the existing woodland, maximise biodiversity, and vastly increase the ecological value of the park. Also, wetland areas were created to filter and clean the water in the park as part of a recycling system that replenishes and helps clean the lake and water features. The wetland areas mimic the characteristics of natural wetlands and create a special ecosystem that encourages greater biodiversity in the park. (Ref. 1)

To test the newly developed Green Factor Tool for the City of Helsinki, with a focus on water management, two test sites (ätkäsaari pilot block and the three model yards in Kuninkaantammi) were created at residential blocks in Jätkäsaari and Kuninkaantammi. The tool itself is an Excel interface that calculates the quantity and quality of the city's green spaces per unit of area, It is part of the larger iWATER (integrated stormwater management) project (Ref 2). Specifically, after testing it on these two pilot sites, it is to support land use planning processes by providing a way to account for the quantity and quality of green space. The project aimed to analyze the cost-benefit of implemented sustainable stormwater solutions, compile stormwater-related planning tools as well as increase and strengthen the capacity of cities to work with stormwater issues (ref. 2).
One of the key objectives of developing the green factor method was to create green urban environments that have social value. Also, functionality was the second most important and cityscape (or landscape value) was the third most important category in green factor scoring.

An enterprise called Alicante Forestal constructed a vertical garden in Mallorca, in an office in Santa Ponca (Ref 1). The garden was installed indoors, making a green wall in the headquarters of the local business (Ref 1). There is in 2020 not only this garden, but a service given by Alicante Forestal in Mallorca to design and install these in other parts of Spain, as well as courses for building these gardens in different countries in the world including Spain, Colombia, Ecuador, Argentina and Mexico (Ref 3).

Parque Central da Asprela is being designed by a team of specialists who see the great challenge of hydrographic control of Ribeira da Asprela and all other surrounding streams as an opportunity to create a unique landscape space in Porto, pleasant not only for the enjoyment of population but also as a crossing solution (pedestrian or cycling) for the academic community that daily studies and works in this area of ​​the city. The park is part of the green lung of the city. This NBS is a continuation of an action implemented in 2015 by the Municipality of Porto that had in mind the creation of a park which eventually had to be renovated and integrated and this is how this new NBS came to be implemented. (1)

As part of the EU Life+ CITYWATER project (of 3 cities), a sustainable stormwater management solution based on biofiltration was implemented in Maunulanpuisto Park in Helsinki, in order to purify rainwater and meltwater and improve water quality in the Haaganpuro Brook.
As the drainage area is heavily trafficked and paved with asphalt, high solid, nutrient and oil levels have occasionally been measured in the rainwater and meltwater entering the Haaganpuro brook. Such contamination is harmful to the fish stocks (e.g. trout) and other organisms in the brook. The biofiltration solution was the first of its kind in Helsinki. The solution also supported the City of Helsinki stormwater strategy, which aims at changing management towards sustainable solutions and states that stormwater should in first hand be infiltrated on spot, where it is created (ref. 1).