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Keywords: Caissons Volkerak.jpg en After floodings of 1953 in the Netherlands the Deltaworks were executed to protect the coast Part of the work was the closure of a sea arm called Het Volkerak Open caissons where placed in the opening and closed when the tidal current was dead and then the caissons were quickly filled with sand and covered up own Jaap Berk 1969-04 See Delta Works Netherlands Delta Works Phoenix breakwaters North Sea flood of 1953 |