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Delta Works, in the southwestern Netherlands, a giant flood-control project that closed off the Rhine, Meuse [Maas], and Schelde estuaries with dikes linking the islands of Walcheren, Noord-Beveland, Schouwen, Goeree, and Voorne and created what amounts to several freshwater lakes that are free of tides. Devised by the Dutch engineer Johan van Veen, the plan acquired great urgency after a catastrophic North Sea flood on February 1, 1953, which killed 1,836 people and devastated 2,070...