The battle against the water Brielse Maas concluded

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To prevent salinisation of the land, the Brielse Maas is closed off from the sea by constructing a dam where the Brielse Maas flows into the sea. The dam has been completed except for a closing hole in the middle, which will be closed by sinking a caisson. SHOTS: - a topographical map shows the situation of the water management near the Voorne-Putten islands in South Holland and the location of the Closure; - a simulation of the Closure is carried out on a small scale in a large basin at the Waterloopkundig Laboratorium in Delft; engineers observe and study the course of events and take measurements; - at the location of the Closure, a floating concrete caisson is brought in by tugboats; at slack tide it is sailed into the hole and placed.

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