Qualla: Volkerakdam

Volkerakdam: Introduction

Sat, 16 May 2026 00:00:00 GMT

Photo credit M.Minderhoud, CC BY-SA 3.0. On 21 April 1966, two construction workers named M. Ten Hove and A. Roelants were digging out the casting basin for the Volkerak lock complex when they found something that did not belong in a 1960s engineering site: a small carved oak figure of a man. Radiocarbon analysis later dated it to the fifth millennium BC, more than six thousand years old, a Mesolithic survivor from the time before farming reached this part of Europe. They were excavating for one of the largest hydraulic projects in human history, the Delta Works, and they had just pulled a human image older than the Pyramids out of the Dutch mud.

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Image: M.Minderhoud | CC BY-SA 3.0

Volkerakdam: The Night of 1953

Sat, 16 May 2026 00:00:00 GMT

Photo credit bertknot, CC BY-SA 2.0. On the night of 31 January and into 1 February 1953, a North Sea storm surge breached dikes across the southwest Netherlands. Nearly two thousand people drowned. The waters reached far inland. The Dutch government appointed a Delta Commission and resolved to close the inlets of Z...

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Image: bertknot | CC BY-SA 2.0

Volkerakdam: Three Structures, Three Waters

Sat, 16 May 2026 00:00:00 GMT

Photo credit Lucas Hirschegger, CC BY-SA 3.0. The Volkerakdam is not a single wall. It is three distinct works crossing three different bodies of water. A solid dam runs from Goeree-Overflakkee to a man-made island called Hellegatsplein. A complex of locks runs from Hellegatsplein into North Brabant, allowing shipping to pas...

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Image: Lucas Hirschegger | CC BY-SA 3.0

Volkerakdam: Caissons in the Casting Basin

Sat, 16 May 2026 00:00:00 GMT

Photo credit Io Herodotus, CC BY-SA 3.0. The locks-and-dam section between Hellegatsplein and North Brabant was assembled from fourteen massive concrete caissons, prefabricated nearby in a casting basin and then floated into place. The first construction phase, the section running from Overflakkee to Hellegat over a sha...

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Image: Io Herodotus | CC BY-SA 3.0

Volkerakdam: Changing the Sea

Sat, 16 May 2026 00:00:00 GMT

Photo credit Henk Jan Verhagen, CC BY-SA 4.0. Closing the Volkerak rewrote the hydraulics of an entire region. Areas south of the dam saw their tidal range increase considerably. Areas to the north saw it decrease. The effect tapered as the distance to Rotterdam grew. Fresh Rhine water that had once mixed into the Oostersche...

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Image: Henk Jan Verhagen | CC BY-SA 4.0

Volkerakdam: The Willemstad Man in Leiden

Sat, 16 May 2026 00:00:00 GMT

Photo credit NearEMPTiness, CC BY-SA 4.0. The carved figure that Ten Hove and Roelants pulled from the Volkerak casting basin in 1966 has been on display in the Rijksmuseum van Oudheden, the National Museum of Antiquities, in Leiden ever since. It is known as the Mannetje van Willemstad, the Willemstad Man, after the nea...

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Image: NearEMPTiness | CC BY-SA 4.0