Wave forces acting in the longitudinal direction of the gates prove more difficult to assess than the transverse influence of waves, but the tests suggest that these forces may be lower than previously assumed. If this is confirmed by real-world monitoring, it will lead to improvements in the maintenance of the side stops (buffers at the ends of the gates), Deltares said.

The wave load on the cylinder rods, which move the sluice gates, also appears to be lower than originally assumed. This means that heavier waves can be absorbed within the current design targets. This is important for the renovation and has a beneficial effect on the reliability of the flood defenses.

Even under very extreme conditions, such as a significant rise in sea level, the tests reveal which scenarios must be taken into account in the future. This knowledge is used to improve maintenance so that the barrier continues to operate reliably in the long term.