Site: Aabenraa, Denmark
Area: 5 km
Status: 2nd round, 1st price

The biggest threat to Aabenraa, in terms of water comes from the sea and so the threat of rain-water to stow up and can not get away. The general approach to water is to use threats to create new recreational and amenity values in Aabenraa – in the same way as the Brundlund castle, where the establishment of ramparts and moat, also becomes part of the amenity provided. Another example is the C TH. Sørensens poplar avenue, which is both a landscape element and solve a real problem.

“During the storm surge pushed water from the Little Belt in Aabenraa Fjord with associated risks of flood-laws of the city. That it can be done, there is no doubt of it has already taken place, for example. Stood fjord in 1872 about 3.35 meters above the normal water level, with massive flooding of the city to follow. The phenomenon occurs rare and it is therefore difficult to assess whether the current climate change increases the frequency significantly, but there is no doubt that both sea level rise which often occurring hurricanes both draws in the wrong direction. The Coast Directorate of risk assessment-ring area is used a water level of 3.62 meters, which simulates the situation that Aabenraa in 2060, is hit by a flood similar to that in 1872 the value created by adding the expected sea level rise of 30 cm and subtracting land uplift of 3 cm. It is here pertinent to note that announced a sea level rise of 0.5 m by the year 2100 (or 30 cm by the year 2060) is an estimate subject to great uncertainty. DMI operates with a range 0.1 to 1.2 m, so the real increases in the worst case can be significantly larger. ”

Competition program:
“Based on Statistics of high Aabenraa assessed the water level of 180 cm DVR90 responding to a 100 year event. The water level 335 cm DVR90 can not an¬gives Based on the statistics, but assessed here as a 700-year event from the storm overall river dissemination and external analysis made on other sites affected by the 1872-flood. The risk area for harbor water level 335 cm DVR90 (S2) calculated at risk properties in the amount of approximately 2.7 billion. kr., made up of 515 properties. ”
Coastal directorates Flood Directive.

Strategy against flooding.
The cost of flood is huge and is a key driver for future security. We have in our project provided a flood-protection to level 2.50.
Protection against flooding is done by digging a canal along Gasværksvej. Earth used to build a dike while there established a green promenade along the canal. On the islands in the harbor secured against future flooding by dredging of channels and placement of the ground to the desired height.
Establish sluices / pumps at the central rainwater and docks and the mill stream.
Flood protection combined with the recreational, amenity related to a better city. Promenade and canal street connects the city with water, harbor, marina, Mølleå park and beach.

During heavy rain, Aabenraa threatened by both behind water as sewer overflows. White water is a popular term for water that does not originate from the city itself, but from the underlying basin. Aabenraa passport-issued by including Mølleåen and Bøgelund brook during heavy rain quickly filled with water from the clay soils toward the west ridge, and in the hilly terrain around Aabenraa is well in the fast lane into the city. You can then occur floods, partly because Watercourses run on the last stretch through the city are less free (put in pipes or ditches) and the city therefore acts as a bottleneck, partly because storm water runoff from the city itself can not find space in the already crowded streams . An additional challenge is that the streams on the last stretch before the mouth of the fjord lies low in the terrain, and it is during high tide in the bay is necessary to pump the water out through the locks. This situation is likely to occur more frequently with the expected sea level rise and more intense rainfall.

Strategy for rainwater.
The two major initiatives is the establishment of central docks, and the expansion of the mill stream as white water faster to get away. The central basin can be used as a local buffer and also has a recreational value, and it pulls water into the center of town. The opening of the mill stream is used to get the green recreational street all the way to the port, link it up to the promenade, the marina, the beach and the pedestrian area. The opening of the mill stream will be a significant contribution to the understanding of the city’s relationship with the landscape, and, along with the new Mølle¬park a recreational hub in Aabenraa.
In addition, it is proposed to reduce the derivation by new construction through the local drainage of rainwater, application of permeable coatings in the hinterland and more green surfaces.
The new residential areas in the harbor ensured by dredging channels, where the excess soil ensures floor elevation at 2:00.

Partners: Transform, Nira, Gehl Architects, Rikke Stenbro

Copyrights: Transform, Kragh & Berglund

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