Delta Works

After the 1953 disaster, the Delta project, a vast construction effort designed to end the threat from the sea once and for all, was launched in 1958 and largely completed in 1997 with the completion of the Maeslantkering. The official goal of the Delta project was to reduce the risk of flooding in South Holland and Zeeland to once per 10,000 years. (For the rest of the country, the protection level is once per 4,000 years.) This was achieved by raising 3,000 kilometers (1,864 mi) of outer sea-dykes and 10,000 kilometers (6,214 mi) of inner, canal, and river dikes to "delta" height, and by closing off the sea estuaries of the Zeeland province. New risk assessments occasionally show problems requiring additional Delta project dyke reinforcements. The Delta project is one of the largest construction efforts in human history and is considered by the American Society of Civil Engineers as one of the seven wonders of the modern world.

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