Hamburg, Germany
City population: 1698688
Duration: 2012 – ongoing
Implementation status: Ongoing
Scale: Micro-scale: District/neighbourhood level
Project area: unknown
Type of area: Public Greenspace Area, Central Business District / City Centre, Other
Last updated: October 2021

The aim of the project is to restore the near-natural state of the Alster, the neighboring floodplains and side waters and thus support biodiversity, the recreational function of the riversides and promote environmental education (Reference 1). The implementation of the project began in 2012 and is planned to continue until 2021. It’s second phase started in 2018, which focuses on redeveloping the inner-city areas of the Alster. (Reference 8) The developers of the project focus on improving biodiversity and habitats. Recent nature conservation efforts included the installation of bee hotels, installation of gravel depots where fish lay eggs and the building of three fish ladders at the Poppenbüttler, Mellingburger and Wohldorfer locks, so that salmon, sea trout and sticklebacks can migrate there again. (Reference 6) In the future, other biotope structures in the urban river environment are to be improved. The project also provides opportunities for voluntary work and educational field trips for schoolchildren. (Reference 9)

Living Alster (2018)
Photographer: Karsten Borggraefe, retrieved 08/13/2018 from Andreas Lampe

Overview

Nature-based solution

  • Grey infrastructure featuring greens
  • Blue infrastructure
  • Riverbank/Lakeside greens
  • Parks and urban forests
  • Green corridors and green belts
  • Rivers/streams/canals/estuaries
  • Other

Key challenges

  • Climate action for adaptation, resilience and mitigation (SDG 13)
  • Climate change adaptation
  • Water management (SDG 6)
  • Flood protection
  • Stormwater and rainfall management and storage
  • Green space, habitats and biodiversity (SDG 15)
  • Habitat and biodiversity restoration
  • Habitat and biodiversity conservation
  • Green space creation and/or management
  • Social justice, cohesion and equity (SDG 10)
  • Environmental education
  • Health and well-being (SDG 3)
  • Creation of opportunities for recreation

Focus

Monitoring and maintenance of habitats and/or biodiversity, Management and improved protection of rivers and other blue areas

Project objectives

- natural development of the Alster river, its side waters and the riversides' greenery - support biodiversity - improvement of the recreational function of the river - providing of environmental education - creating habitats for species (Reference 1) - supporting the migration of fishes (Reference 4) - developing the floodplains that have a central role in the biotope network of the river and are more beneficial for flood protection. “An intact floodplain and a catchment area that delay the runoff of heavy rain events is the goal of sustainable water management.” (Reference 11) - developing an innovative solution for nature conservation in the inner canalized parts of the river and implement a narrow green corridor leading from the Alster to the Elbe (Reference 2)

Implementation activities

- Recent nature conservation efforts included the installation of bee hotels, installation of gravel depots where fish lay eggs and the building of three fish ladders at the Poppenbüttler, Mellingburger and Wohldorfer locks, so that salmon, sea trout and sticklebacks can migrate there again. (Reference 6) In the future, other biotope structures in the urban river environment are to be improved. The project also provides opportunities for voluntary work and educational field trips for schoolchildren. (Reference 9) -narrowing some parts of the riverbed with gravel (87 tons) that speed up the flow of the river, clean the water and create water habitats - placing dead trees in the water of the Outer Alster that provide food and habitat for aquatic animals - excavating sand from the riverbeds in some parts, meanwhile installing gravel depots on other parts of the riverbed. - organizing field trips for schoolchildren and canoeing trips that promote environmental education (Reference 2) - developing an intact floodplain and catchment area that have a central role in the biotope network of the river (Reference 2, 3) - narrowing parts of the riverbed with gravel that speed up the flow of the river, clean the water and create water habitats (Reference 2) - placing dead trees in the water that provide food and habitat for aquatic animals (Reference 2) - excavating sand from parts of the riverbed (Reference 2)

Climate-focused activities

Climate change adaptation:

  • Restore wetlands and/or coastal ecosystems to dissipate the effects of flooding and/or storms
  • Renaturalization of rivers and other water bodies

Biodiversity conservation or restoration-focused activities

Biodiversity conservation:

  • Protect and enhance urban habitats
  • Preserve and strengthen existing habitats and ecosystems
  • Promote environmentally-sound development in and around protected areas
  • Reduce negative impacts and avoid the alteration/damage of ecosystem
  • Protect species
  • Undertake specific measures to protect species
  • Undertake specific measures to protect native species
  • Undertake specific measures to protect endangered species
  • Undertake specific measures to protect valued species
  • Means for conservation governance
  • Raise public awareness
  • Capacity building

Biodiversity restoration:

  • Rehabilitate and restore damaged or destroyed ecosystems
  • Restore species (native, endangered, or unspecified)
  • Restore native species
  • Restore valued species
  • Restore endangered species
  • Restore ecological connectivity
  • Public engagement

Main beneficiaries

  • Local government/Municipality
  • Non-government organisation/Civil Society
  • Citizens or community groups
  • Young people and children
  • Other

Governance

Management set-up

  • Co-governance with government and non-government actors

Type of initiating organisation

  • Non-government organisation/civil society
  • Other

Participatory approaches/ community involvement

  • Dissemination of information and education
  • Consultation (e.g. workshop, surveys, community meetings, town halls)
  • Joint implementation (e.g. tree planting)

Details on the roles of the organisations involved in the project

In the project, 3 environmental associations cooperate (the Aktion Fischotterschutz, BUND Hamburg and NABU Hamburg) with the State Council of the Department of Urban Development and Environment (Reference 1). The description of the project writes: "The project was initially funded by the Michael Otto Stiftung, the North German Foundation for Environment and Development, via the Erträger der Lotterie Bingo! The environmental lottery and the Free and Hanseatic city of Hamburg. Currently the Foundation for the Habitat Elbe and the Hamburg Authority for Environment and Energy are the main sponsors" (Reference 1).

Project implemented in response to ...

... an EU policy or strategy? Yes (The project is in line with the EU Water Framework Directive. The description of the project writes: "One of the main objectives in implementing the EU Water Framework Directive is to establish ecological continuity of water bodies for fish and other aquatic organisms. In Hamburg, a major aspect in achieving this objective is represented by the Alster river system, featuring numerous tributaries (Reference 4).)
... a national policy or strategy? Yes (In 2007 Germany adopted the National Biodiversity Strategy containing targets and measures to be implemented by 2020 (Reference 7). This specific project was awarded as a project of the UN Decade for Biological Diversity. "The award for the UN Decade Project is part of the activities of the United Nations Decade of Biological Diversity, which was called by the United Nations for the period from 2011 to 2020. The aim of the international program is to stop the worldwide decline in biodiversity. In line with this, the German UN Decade aims to raise social awareness in Germany. The award of exemplary projects aims to promote public participation" (Reference 6). )
... a local policy or strategy? Unknown

Financing

Total cost

Unknown

Source(s) of funding

  • Public local authority budget
  • Funds provided by non-governmental organization (NGO)
  • Crowdfunding
  • Other

Type of funding

  • Direct funding (grants, subsidies, or self-financed projects by private entities)
  • Donations

Non-financial contribution

Unknown

Impacts and Monitoring

Environmental impacts

  • Water management and blue areas
  • Enhanced protection and restoration of freshwater ecosystems
  • Green space and habitat
  • Increased conservation or restoration of ecosystems
  • Increase in protected green space areas
  • Reduced biodiversity loss
  • Increased number of species present
  • Increased protection of threatened species
  • Increased ecological connectivity across regeneration sites and scales

Economic impacts

  • Unknown

Socio-cultural impacts

  • Health and wellbeing
  • Gain in activities for recreation and exercise
  • Cultural heritage and sense of place
  • Protection of natural heritage
  • Protection of historic and cultural landscape / infrastructure
  • Increased appreciation for natural spaces
  • Education
  • Increased support for education and scientific research
  • Increased awareness of NBS and their benefits

Type of reported impacts

Achieved impacts

Presence of formal monitoring system

Unknown

Presence of indicators used in reporting

No evidence in public records

Presence of monitoring/ evaluation reports

No evidence in public records

Availability of a web-based monitoring tool

No evidence in public records

References