Improved water quality

Wetlands provide a varying degree of treatment of discharged water and are ideally suited for the containment and treatment of polluted water runoff, being a holistic example of Sustainable Drainage Systems (SuDS). The Dublin Local Authority installed an Integrated Constructed Wetland to treat polluted water discharged from the urban area, with the aim of cleaning urban runoff and drainage water. It was meant to purify water that discharges into a pond, and later on into the Tolka river. The project has been very successful in treating polluted water effectively, according to studies. (Ref. 1; Ref. 3)

The Dee Park Regeneration Project aims to rebuild the 1,100 homes from the 1960s-built estate, that has been worked on in close consultation with the community. The estate is one of the 20 per cent most deprived areas in the country. The vision for the regeneration project is to create “a safe, inclusive and sustainable community, economically, environmentally and socially, as part of the wider Reading, where people want to live and work, and which will inspire a sense of pride”. The third and final phase of the project is ongoing and is expected to be completed soon. (Ref. 1, 4, 8, 9)

The area of the Port of Antwerp is one of the most important habitats for threatened species, even at the European level (Ref. 1). Therefore, a species protection programme was launched in 2014 for the conservation of 90 protected species by means of creating an ecological infrastructure of green areas, green corridors and small green spaces that include spawning grounds, ecological river banks, and road verges (Ref. 1, 2, 3).

New recreation zone "Norikus Bay" in Nurenberg was completed in 2018 on the south bank of the Wöhrder lake, an artificial lake created in 1968 to protect the city from flooding. The dam itself, which is a 400m long path separating a part of the water surface from the bigger part of the lake, has become a tourist attraction with a water playground and other recreational amenities being offered. The water is naturally cleaned through the regeneration zone with natural plant filter, and simultaneously improves the habitat of fish and makes recreational swimming in possible in the cleaner water. New green areas are organized on the shore in order to improve environmental, aesthetic and recreational conditions of the area (1, 7, 8).

View Island in Reading is a relaxing island with natural open space with grassy paths and seating near to the weir at Caversham Lock. A conservation project has been carried out to e.g. improve water flow, improve biodiversity, and improve the entrance to and around the island. The work has been carried out in consultation with Reading Borough Council, the Environment Agency and has been designed and constructed by Riverworks Ltd. (Ref, 1, 2, 3)

From 2006 onwards, the urban stream Wupper and its riverbanks were redeveloped and ecologically improved via several water management and planning measures across the city of Wuppertal. Initiated by the city administration and the public sector company Wupper, they aimed at improving the environmental- and water quality or the area and enhancing biodiversity in and around the Wupper. These efforts were accompanied by additional citizens' initiatives with the same goal. (Ref. 1, 2, 3, 9). According to the EU Water Framework Directive, 27 percent of the Wupper and its tributaries are now in good condition, which is well above the German average of 8 percent. The complete renaturalization is planned to be completed by 2025. (Ref. 12)

Wertach Vital is a project to reconstitute the Wertach river between the southern Augsburg limits and its confluence with the river Lech. Starting from the south, the flood protection has been improved, the depth of the river bottom has been halted, the river bed has been expanded and the banks have been upgraded as a recreational area. A major part of the measures has been completed. The project is supported by the Free State of Bavaria and the City of Augsburg, co-financed by the EU (Ref. 1).

The Harris Garden is situated on the Whiteknights campus of the University of Reading. The garden provides an important amenity for all, giving pleasure to an increasing number of visitors, staff and students. It provides facilities for teaching, conservation and recreation. In 2010, with the closure of Plant Sciences, responsibility for the main part of the garden passed to the Facilities Management Directorate of the University and a major revitalisation programme began; with the "new purpose of conservation and recreation for all". (Ref. 1 , 2)

Management of natural lime-dry grasslands on gravel banks in Augsburg is conducted by the Landcape Association of the City of Augsburg (Bavaria, Germany). 300 ha of biotopes within the municipal area is maintained due to sheep grazing, mowing management, scrub clearance and reopening of potential expansion areas as well as further activities to create initial stages of immature soils and recreational purposes (Ref. 1).

The aim of ReWaM was to show ways how different forms of use of water bodies can be reconciled with their protection in order to sustainably maintain the diversity and efficiency of the different water ecosystems. This applies to both rural, suburban and urban regions (ref. 8). Increased sealing of urban surfaces and combined sewer systems for rain- and wastewater pose major challenges for urban water management. Therefore, the university of applied sciences and the city of Münster participated in a research project as one of three pilot cities running from 2015 to 2018 concerning improved rainwater management and the development of respective planning instruments. Several green roofs at the university campus were used as test spaces to explore and monitor rainwater infiltration efficiency and feasible green roof compositions. Also, different permeable surface coatings were tested at the urban depot (Ref. 1 and 4).