Improvements to water quality

The Sotos de la Albolafia Natural Reserve is situated on a section along the Guadalquivir River, that runs from the Roman Bridge to the San Rafael Bridge (Ref. 3,14). It was declared Natural Monument in 2001 and is part of the Network of Protected Natural Areas of Andalusia (RENPA) due to its wide variety of birds (Ref. 5,15). "The declaration recognized the environmental value of the Sotos de la Albolafia, a singular natural enclave located in the urban center of a large city, in a monumental and historical environment also unique and with an unparalleled concentration in protected species, especially water birds and wetlands." (Ref. 3)

A water park has been constructed for the treatment of the pumped groundwater and stormwater from Roslagsvägen. A sedimentation basin is being built by the Swedish Transport Administration in connection with the construction of the Northern Link. The stormwater is led via an overloaded sedimentation basin, which is also supplied with large amounts of leaking groundwater from the metro. The goal is to reduce the phosphorus supply by about 25%. (Ref. 3,4)

A 40 m2 vertical garden installed on one of the clinic's walls in 2012. It was the first vertical garden to be constructed in a hospital in Europe. It aimed to create a pleasant and relaxing atmosphere for visitors and patients at the clinic, improve the air quality and humidity of the complex and beautify the space of the hospital. (Ref 1) Over 1400 plants with over 40 species were included in the vertical garden (Ref 2).

Østensjøvannet is a nature reserve covering an area of 539 acres, which includes both the water body and certain parts of surrounding land. It was established in order to preserve the important wetland area and its associated vegetation, bird and animal life significant for the region. In June 2002, Oslo municipality went further and created the Østensjøvannet Environmental Park, which covers 1187 acres of land and water. The park aims to further protect and strengthen the area, which is one of the most popular recreation areas of Oslo, and acts as an important area for research and education. (Ref. 1, 7)

“The Guadalquivir River offers some of the best landscape, ecological and environmental values. There is an exceptional variety of flora and fauna and the river is considered as one of the main lungs of the city and as a privileged area for the residents”. (Ref. 12) The river is an essential element of Cordoba, having been declared a natural monument in 2001. (Ref 3, p.4) There are ongoing efforts to maintain and restore the river as a natural and cultural heritage site (Ref. 1,2,5,8,9) and a space for recreational activities (Ref. 12).

Oslo municipality is underway with the large-scale project of opening up rivers that previously were running in underground pipes. Alna Environmental Park is a part of this project and includes major transformation and environmental upgrade of the river Alna. The Environmental Park runs along the river and has transformed grey structures to accessible parks and recreation areas and now acts as an important resource for Oslo's citizens. Central aims of the project are to improve the self-cleaning ability of Alna, while maintaining biodiversity in the region and to inspire future urban development. (Ref. 1, 3)