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Logo Noorderzijlvest Water Authority
Logo Noorderzijlvest Water Authority

Expansion of balancing lake De Onlanden

De Onlanden is a nature reserve with plenty of room for water. And that is important. Because when it rains a lot, it is possible to collect water here. We call this a balancing lake. This ensures that residents in the area suffer as little nuisance from the water as possible. Due to climate change, we expect more frequent and heavier rainfall. Therefore, we need extra space for water.

Additional balancing lake

De Onlanden is both a balancing lake and a nature reserve. Its storage capacity will be expanded from 7.5 to 12.7 million cubic meters of water.

Measures

  • Realisation of balancing lake
  • Nature conservation measures
  • Additional measures

Work activities

The latest information about work on the balancing lake. The project will continue until 2027.

Stream valley

The expansion of the balancing lake goes hand in hand with the redesign of the stream valley. 
 

Dry feet 2050

How can we combat flooding by 2050? We are considering this together with other authorities. De Onlanden is part of our approach.

Frequently asked questions

Read the most frequently asked questions about the balancing lake.

News Expansion of De Onlanden balancing lake

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Questions?

If you have any questions about the project, please contact us at:

De Onlanden balancing lake in brief

In De Onlanden, water is already collected when there is heavy rainfall. Because climate change is causing more frequent heavy rainfall, the balancing lake is being enlarged from 7.5 to 12.7 million cubic meters. This is being done within the existing quays. Part of the work will be completed by early 2026, with all work scheduled for completion in 2027. All the extra space is expected to be needed once every 25 years. Once every 10 years, part of the space will be sufficient. We will then store the water temporarily in the balancing lake, after which it will be discharged slowly into the sea.