Sluice system at Aarhus River reduces the risk of flooding
The City of Aarhus has established a sluice at the mouth of the city's river, Aarhus Å. The sluice protects central parts of Aarhus against flooding.
The construction serves two purposes. Firstly, four sluice gates will protect the city against intruding seawater during high sea levels, and, secondly, six powerful pumps will pump water away from the river and into the sea during cloudbursts.
The sluice can pump as much as 18,000 litres of water per second from the river and out into the sea.
In order to provide further protection for the low-lying parts of the city during high water levels, the two streets, Havnegade and Europaplads, as well as the area around the sluice itself, have been raised.
The construction costs totalled DKK 46 million. A traditional solution, with underground retention basins to retain the water, would have cost ten times this amount.
Slotsholmen in Copenhagen is now well protected from the next cloudburst
In order to protect the area around Slotsholmen, a small island district in Copenhagen city centre and the seat of national government, against seawater during extraordinarily high water levels, the quay walls around Frederiksholms Kanal have been reinforced and raised over the years.
However, the intention to protect the city against seawater has had the unfortunate consequence that during heavy rainfall the rainwater cannot run out into the harbour.
Copenhagen experienced this during the intense cloudburst in the summer of 2011, when many buildings around Slotsholmen stood under water. Steps have now been taken to prevent this from happening again.
During very powerful rainfall events and cloudbursts, the rainwater is today directed via grates along the sides of the road and via underground drains to an opening in the quay where the rainwater runs out into the harbour.
At the outlet there is a non-return flap valve, which ensures that the water can only run out and not in. During very high water levels, the valve shuts and flooding is prevented.
Green rainwater solution creates a new beautiful urban space in Copenhagen
Tåsinge Plads, a square in the district of Østerbro, Copenhagen, has been protected against heavy rainfalls. A total of 2,000 square metres of asphalt and a rather boring piece of lawn have been removed and transformed into a green oasis that can retain and collect rainwater from an area of road and rooftops half the size of a soccer field.
So there is no longer the same risk that sewers will overflow in the event of powerful rainfall, because rainwater from the square and surrounding roofs will now drain into a series of rainwater basins or it will seep down into flower beds planted with plants that tolerate salty water. At the same time, residents in the area now have a new, exciting urban space; a meeting place for adults and a playground for children.
Stream restoration in Haarby reduces the risk of flooding
The city of Haarby in the Municipality of Assens on Funen experienced occasional flooding due to raised water levels in the local watercourse Haarby Å. As a consequence, the municipality established a new wetland area north of the city. The watercourse was remeandered and two new lakes were established. The new wetland serves as a retention buffer during heavy rainfall and therefore reduces the risk of flooding downstream in the city.
Novo Nordisk headquarters in perfect water balance
The new Novo Nordisk headquarters in Bagsværd on the outskirts of Copenhagen stand out in more than one way. With green roofs, water reservoirs, well-conceived natural areas and a large underground gravel cushion, the group's new domicile will retain all rainwater on site. "Keep expenditures at a minimum by involving the public authorities early on in the process!" This is the advice from the group.
Rainwater used as a resource at new hospital
When the new Central Denmark Region hospital in Gødstrup stands ready in 2020, it will include an innovative and sustainable concept for managing surface water and rainwater that will transform the hospital into a resource.
Keeping children's feet dry
Recent years' extreme rainfall events have exposed a large daycare institution to repeated flooding. A simple dyke around the daycare institution has now solved the problem.
Climate change adaptation of vulnerable areas
The Municipality of Dragør includes some of the most vulnerable land in Denmark with regard to sea level rises and storm surges. Climate change adaptation is important not only for the municipality itself but also for the neighbouring municipality, for nature management in general, as well as for the Metro, the Øresund link and the Ørestad urban district. Collaboration, communication and innovative thinking are therefore vital for climate change adaptation measures regarding Dragør's vulnerable areas.
Exemplary climate change adaptation efforts by a school
Lindebjerg school is a small village school near Roskilde. It has gradually come to be known as the 'Climate School'. An ambitious project with local drainage of rainwater (LAR) is teaching pupils to see water as a resource through learning and playing, and the effect is now spreading like ripples on a pond.
New model identifies vulnerable areas
Find recent examples
The Danish Road Directorate has developed a new model for risk mapping roads vulnerable to extreme rainfall. The analysis model in question calculates the probability as well as the impacts of flooding events. The model therefore allows the Danish Road Directorate to target its initiatives and get the best out of money spent on climate change adaptation.