Dike reinforcement Den Oever-Den Helder

The dikes between Den Oever and Den Helder protect 1.2 million North Hollanders from high water from the Wadden Sea. It concerns the Wieringer Zeewering, the Amsteldiepdijk and the Balgzanddijk. These dikes must be reinforced because they do not meet the latest safety requirements in all places.

For now, it's not unsafe. But to ensure that everyone can continue to live, work and recreate safely here and in the hinterland in the future, we are looking at which solutions are best suited. We like to do this in consultation with the environment.

Would you like to know what is involved in a dyke reinforcement project? You can find out in the book 'DIJKEN voor beginners'.

Latest project status

The original plan was to submit the draft Water Act project plan and the draft environmental impact report (EIR) to our board before the 2023 summer vacation. After approval by the Provincial Executive of the province of North Holland, the public inspection would begin in mid-October. However, new insights regarding the strength of the dike require more time for in-depth research, resulting in a schedule delay. The investigations will reveal the impact on the project and what this means for the planning. More can be expected about this this fall. After sharpening the technical designs, the administrative decision-making procedure will follow as final preparation for the realization phase. The realization phase is expected to start in late 2025/early 2026.

Information for contractors

We are pleased to inform the market of the proposed contract form and tender schedule for the Den Oever-Den Helder dike reinforcement project. The project will be tendered in the form of an Engineering & Construct (E&C) contract. The tender notification phase is scheduled for the fourth quarter of 2025. Further details on the tender procedure will follow in due course.

Collaboration

The dike reinforcement is a project within the framework of the national High Water Protection Program (HWBP). A program in which the national government and water boards work together intensively to protect the Netherlands from flooding. We are also working together in this area with the province of North Holland and the municipalities of Hollands Kroon and Den Helder.

Current

Notification participation

In this dike reinforcement project in the Noordkop, we are working according to the guidelines of the Omgevingswet. Therefore, at the start of the planning phase (early May 2021) we published the participation notification. In it we indicated how and when we would inform the surrounding area and ask them to participate, with the ultimate goal of arriving together at an established Project Decision. 

Preferred Alternative

The Executive Board adopted the preferred alternative (VKA) for strengthening this dike section on June 23, 2020. The most suitable solution per dike section (Wieringer Zeewering, Balgzanddijk, Amsteldiepdijk) is now known and can now be worked out in more detail.

Survey map with locations of dike reinforcement Den Oever - Den Helder

What's going on?

On the outer side of all three dike sections, the revetment, consisting of zetestone, asphalt and grass, does not comply in large parts. And along the Balgzand Canal, the dike is not stable enough on the inside in certain sections.

What does the VKA look like?

During the reconnaissance phase, we looked at a wide range of possible solutions for all three levees together with the environment. The VKA consists of:

  1. On different parts of the three dike sections we are reinforcing the revetment on the outside. It concerns asphalt, grass and stony revetment.
  2. Of the Balgzand dike, we are reinforcing the inner toe of the dike by a paving in certain sections.

Between 2017 and 2019, we organized several dike evenings (meetings) for stakeholders, local residents and other interested parties. During these meetings, among other things, we showed possible solutions for the dike reinforcement. We also provided feedback on questions and wishes we collected from the surrounding area. In the fall of 2019, we presented the preliminary choice for the preferred alternative. The Executive Board adopted the preferred alternative on June 23, 2020. The preferred alternative was designed together with the environment.

Working on a project decision

At the end of the plan development phase, the board lays down the design for the dike reinforcement in a project decision. This decision must be approved by the Provincial Executive of the province of North Holland.

Why a notification?

The next project phase, the plan execution phase, started in 2021 and ends with a project plan/project decision. This phase involves working with the surrounding area to develop and design the preferred alternative (VKA). This phase determines what the dike will look like after the reinforcement. This phase will also include determining which co-option opportunities can be implemented. The purpose of the announcement is to inform you about the participation during the planning phase. View the full announcement.

More information about the dyke sections

Wieringer Seawall

The Wieringer Zeewering is the section of dike that runs from Den Oever to the Amstelmeer and is over 10 kilometers long. The dike is loaded directly from the Wadden Sea. The hinterland is the former island of Wieringen and is mainly rural in nature. The foreland is the Wadden Sea, an area of high natural value. Along the dike are places like Den Oever and Hippolytushoef.

Amsteldiepdijk and Balgzanddijk

The Amsteldiepdijk connects to the Wieringer Zeewering and runs to the Van Ewijcksluis. The Balgzand dyke is an extension of this and continues up to the sluice at Oostoever.

The dikes are enclosed by water on both sides; on the outside is the Wadden Sea. The Amsteldiepdijk was constructed in 1924 as a pilot for the Afsluitdijk, creating the Amstelmeer on the inside. On the inside of the Balgzand dike is the Balgzand Canal, an important drainage canal for the Water Board. In some places there is a foreland barrier, a dike in front of the dike into the sea. Together, the Amsteldiepdijk and the Balgzanddijk are about 10 kilometers long.

Contact

Do you live near the Den Oever-Den Helder dike reinforcement project or are you otherwise involved in this area? This news page will keep you informed of current developments surrounding the dike reinforcement.

For more information about this project, contact environmental manager Britte Mussche at 072 - 582 8282, dijkversterkingdodh@hhnk.nl or through the contact form.