Schweiburger sewer – Wadden Sea, Germany

Dike expansion is a permanent task, as dikes are dynamic structures and are therefore subject to subsidence and subsidence. The I and II dyke band Oldenburg have the task of protecting the country from floods and storm surges. Without a protective dike, this would mean flooding the country twice a day in the tidal area. The tidal range is the water level difference between ebb and flow (i.e. low water = ebb and flow = flood). This difference is about 3.50 m for us. The dike has a height of 10.00 m above sea level on the North Sea and a height of up to 8.00 m above sea level on the Weser. In the event of storm surges, the water can rise up to 3.50 m above sea level and higher (MTHW on the coast at approx. 2.00 m NN). Then it becomes critical because the waves can hit the dike, soften and destroy the inland mountains and erode the entire dike.

Safety and quality of the installed products are therefore essential. Resistance to sea water is only one of the necessary properties that the DOYMA sealing inserts C / T / NZ (pressurized water, divided, not centric) were able to demonstrate for this special construction project. The special combination or nature of the stainless steel and rubber material used for the sealing insert are decisive for the safety of the water resistance of the plank system. A guarantee of 25 years reflects the durability of DOYMA quality. The Schweiburger Siel in the main dike line was abandoned. In 2006, the replacement structure “Muzzle pumping station Schweiburger Siel” was built as a deep-seated solid structure as a pumping station with three pump runs and one outlet structure. Both parts of the structure were equipped with a DN 1000 pressure pipeline with new DOYMA sealing systems and the work on the structure was started. In addition, global changes will have to be responded to in future in order to protect the species-rich nature of this unique area around the Wadden Sea.

The tidal flats between Schweiburger Siel and Sehestedt are only reached late by the flood, and are therefore shortly before flooding preferred habitats for wading birds and shelducks looking for food. In May and from August to October, this area is one of the largest flood rest areas in the Jade Bay. If you want to experience the migratory birds accompanied by ornithologists, you should enter the migratory bird days in the calendar. Every year, the Lower Saxony Wadden Sea National Park organizes a theme week with excursions on foot, by bike, boat or bus, workshops and lectures to celebrate the bird migration spectacle in autumn.

If you are traveling here, you can enjoy the view of the bird life in the Wadden Sea and the unique coastal landscape on the Schweiburger sewer.

Get social


View of the intake structure of the Schweiburger sewer Photo: copyright: NLWKN
View from above of the Schweiburger sewer and the outlet structure Photo: copyright: NLWKN
View from the inland of the Schweiburger sewer to the dike and the Wadden Sea Photo: copyright: NLWKN
The Schweiburger sewer with dike landscape Photo: copyright: NLWKN


II. dyke band Oldenburg represented by NLWKN Brake-Oldenburg, Germany

Excecuting company

Behse GmbH, Germany

Trading company

n. a.



Year of installation

Product range(s)

Sealing systems


Curaflex® C / T / NZ special version made of 1.4539 / EPDM "

• C = against pressing water
• T = split version
• NZ = not centric

Seal all existing pipe ducts against pressurized water. Durable, seawater resistant seal.