The Netherlands’ “No Regret” Approach to Sea Level Rise Adaptation

By Jamie Chan 22 October, 2026

Already thriving below sea levels, how are the Dutch responding to a future of uncertain sea level rise? CWR's Chan looks at the country's holistic strategy for 2100 & beyond

The Netherlands has been thriving below sea levels for decades thanks to its advanced system of dikes, pumps, polders, and flood gates. But is this system strong enough to keep the country safe & liveable against rapid sea level rise (SLR)?

To answer this question, in 2019, the Dutch government commenced a 6-year Sea Level Rise Knowledge Programme and the Ministry of Infrastructure & Water Management recently published the programme’s findings in June 2026.

We read it and we were impressed with the Netherlands’ “no regrets” approach to SLR planning – clearly they know how much is at stake and have mounted a plan to act. Here, we share 3 takeaways from its comprehensive study…

1. “Just-in-case” planning leaves no regrets: coastal protection measures stress tested to 5m

The Netherlands knows that “sea level rise is set to continue for centuries, even if greenhouse emissions stop completely”. This upward trend is certain; what remains uncertain is how quickly sea levels will rise – this will be determined by how fast the Antarctic ice sheet melts and observations are already showing unstable, accelerating melt – see new research here.

SLR could be 2m by 2100 & 5.4m by 2200 off the Dutch coast

If this continues, the study notes that SLR off the Dutch coast could reach 2m by 2100 and 5.4m by 2200. The programme thus took this extreme scenario of 5.4m of SLR to stress test its coastal protection measures – this just-in-case approach will help the country remain prepared for the very worst-case scenario.

New issues relating to flood risk management will arise with each metre of SLR. For example:

• For 1m of SLR: storm surge barriers must be upgraded;
• For 3m of SLR: dikes need to be up to 6m higher & up to 90m wider; and
• For 5m of SLR: 2.5x-6x more sand needs to be replenished to maintain the coastline.

“Today, we need to always have effective plans in place, given the uncertainty about the rate of sea level rise”. This prudent approach is crucial for SLR especially since ice is melting at unprecedented rates. If the tragic Nepal mountain failure can happen because of permafrost instability, then marine ice cliff instability could also happen to our ice shelves – this would unleash rapid SLR.

So, prepping for the very worst means the Dutch remain in control of their future. They will do this by “effectively monitoring SLR, continuing to search for and research new solutions, experimenting with these on a small scale and applying new insights to develop improved strategies. This this will enable us to remain flexible and in control”.

2. Investing in what works: current flood protection approach will withstand at least up to 3m

Continuing to invest in its current coastal protection approach (coastal sand nourishment, dikes, dams & storm barriers) will protect the Netherlands “at least up to 3m of SLR and in principle up to as much as 5m, if SLR is not too rapid”. If SLR speeds up, then the approach will be fast tracked.

The Netherlands is prepared to spend more: 1.5-2x for annual dike reinforcements + 3-7x for sand nourishment

Over time, the country is prepared to spend 1.5-2x more on annual costs for dike reinforcements (the Dutch Flood Protection Programme 2022 annual budget was reported to be EUR360mn) and 3-7x on sand nourishment. Energy costs will also rise as they rely more on pumps to protect against flooding and to discharge water affected by salination. Also, storm surge barriers will need to close more frequently which will reduce shipping through the Netherlands’ key ports. These economic impacts are all considered.

Relocating is a last resort: “We will also be able to continue to protect low-lying parts of the Netherlands from flooding, including the Randstad, in principle up to 5m of sea level rise. As long as that remains possible, it makes no societal, financial or economic sense to relocate the residents and businesses of the low-lying Netherlands to higher parts of the country”.

This is because “relocating housing, businesses and land use will cost substantially more than continuing to invest in dike reinforcements”. Such statements reassure Dutch residents and set clear directions for urban planning as well as future investments in the Netherlands.

3. Recognising vicious cycles: living with more salinity & less freshwater

Other than flood risks, SLR will also lead to salinisation of low-lying land as well as saltwater intrusion of water channels. The Netherlands’ coastal polders stay fresh & suitable for agriculture because its rivers discharge water to flush out the salt, but as river flows diminish due to climate change, that leaves less water available for drinking purposes and flushing polders.

Coastal lands are thus more vulnerable to intensifying saltwater intrusion from sea level rise as well as rivers running dry – more on this here.

When seas rise to 0.5m, the country will need twice as much river water to manage polder salinisation, bringing on real competition for freshwater. The question then becomes: how to allocate Rhine river waters between household needs and flushing to manage polder salinisation?

Not just saltwater but also freshwater problems in the future with the Rhine already flowing at record low rates

Note that the Rhine is already flowing at record low rates this summer, already affecting cargo shipping and hydrogeneration across Germany, France & Switzerland. Glacier melt from the Swiss Alps feeding the Rhine today may no longer be there in the future – shockingly, Swiss glacier researchers report that the Swiss Alps have lost almost 20% of their ice since 2021.

Again, the Dutch are taking a practical & prudent approach – they have accepted that salinisation is unavoidable and are adopting the strategy of: “combat salinisation where possible, live with salinisation where necessary”. This could mean exploring salt-tolerant varieties of common crops or spices.

Concerningly, the study finds that at reaching around 1m of SLR, “there will not be sufficient river water to ensure all major freshwater systems are kept fresh and make sufficient water available for water users”.

So, plan sea level rise with river discharge in mind. Plus, don’t forget that saltwater intrusion also impacts coastal water security – more on this here.

Stay ahead … Go Dutch!

Overall, the Netherlands is ahead of the game because it’s had 30-70 years of experience in managing sea levels with infrastructure solutions – that also means they have the most wisdom to share to the rest of the world. It’s clear the Netherlands is taking SLR seriously as a security issue affecting water, energy, housing & economy, and this study sets solid grounding for long-term policy-making from water management to economic planning.

Even if countries cannot replicate the Dutch method, this sets up best practices for other coastal cities and countries to follow.

So go Dutch… be realistic; go long with your adaptation planning – and be ready to live with inevitable impacts.

Further readings

• Singapore’s New Coastal Protection Bill – 3 Key Updates – How will Singapore build 300km of watertight coastal infrastructure around its border? CWR’s Chan breaks down its new sea level rise defence mandate into 3 private sector implications
• Adaptation Strategies & Water Governance in the Netherlands & Bangladesh – ‘Delta plans’ help prepare for long-term climate adaptation – De Heer, Minkman & Van Alphen explain how
• From Brown to Green – but Only if the City can Cope – Resilience at an asset level isn’t enough anymore. Investment strategist Currimbhoy shows how cities can leverage adaptation to improve investor confidence

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• HK & Fast Rising Seas – 3 Must-Do’s to Keep HK Safe – Capital will move to safe havens as climate risks escalate. CWR explains why HK needs a “no-regret” adaptation plan to futureproof HK as Asia’s premier financial hub