In November 2023, a critical tech failure came very close to causing a massive flood in the Amsterdam city center. The issue occurred when the control system of the sluice gates in IJmuiden, responsible for keeping the North Sea water out of the Netherlands, unexpectedly switched to manual operation. This resulted in all seven gates being left fully open, allowing billions of liters of seawater to flow towards Amsterdam undetected.
The glitch, which remains unexplained, was not immediately noticed. It was only after around two hours, when the water level in the North Sea Canal was about 20 centimeters higher than normal, and the sluice gates could only be operated manually, that Rijkswaterstaat operating staff became aware of the issue. However, they attributed the high water level to the storm Ciarán, rather than the open sluice gates.
It was an alert employee of the Amstel, Gooi, and Vecht water board who pointed out that the open sluice gates were causing the high water levels, leading to the immediate action of closing the 14 locks to the city center. By 7:24 a.m., a technician managed to manually close the sluice gates in the IJmuiden complex, averting a potential disaster.
At that point, the water level in the North Sea Canal was 13 centimeters below Normal Amsterdam Level (NAP), which is 32 centimeters higher than the normal level of -0.45 meters below NAP. The Rijkswaterstaat has since taken several measures to prevent a similar crisis in the future. These include moving the operation of the sluice complex from the Oranjesluizen in Schellingwoude to the IJmuiden complex itself, ensuring that Rijkswaterstaat employees can visually inspect operations if necessary. A contractor has also been stationed 24/7 at the IJmuiden complex to intervene immediately in case of issues. Operating staff have also received additional training.
This near-fatal incident underscores the critical importance of maintaining and monitoring the technology that safeguards our cities from natural disasters. It highlights the need for redundancy in critical systems, increased vigilance during severe weather conditions, and continuous training for personnel to quickly respond to potential crises.
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