Delta Works, Netherlands

The flooding in 1953 made it very clear how vulnerable the land and the people living there were. Therefore a huge effort the Delta Works project was made to create a new and better protection to make sure this would not happen again.

The Delta Works protects a large area of land around the Rhine-Meuse-Scheldt delta from the sea. Delta Works is a very complicated collection of locks, sluices, channels, bridges, slides, dams, dikes, storm surge barriers and gates working together.

The aim of the dams, sluices, and storm surge barriers was to shorten the Dutch coastline, thus reducing the number of dikes that had to be raised. This dam consists of several strings of gates and their massive supporting pylons which, in normal weather, allow tidal sea waters to ebb and flow in the Eastern Schelde estuary, thus benefiting the fish, bird life and the local fisheries. The four great estuaries in the south-western Netherlands should be closed with dams. These closures should be done in a special order because of tidal movements of shipping and fishing, this guarantees for the economy of the country.

The piers and their mechanisms had to be lifted into precise positions in the estuary. But the type of equipment needed for such gargantuan and specialized tasks did not exist anywhere in the world; it had to be invented. The piers support 300- to 500-ton steel gates and their hydraulic machinery, as well as a roadway above and load-bearing beams below.

The Oosterscheldedam is on one of the two artificial islands situated in Zeeland, just an hour and a half driving distance from Amsterdam and half an hour from Dordrecht where the structure is located; it is a recommend for those interested in water management. Three kilometres long, this anti-tempest dam is constituted of 65 pillars between which one can slide 62 iron flood-gates.

The height of one pillar is 38 meter and its weight 18.000 tons. When the sea becomes dangerous, one hour is enough to lower the flood gates. This system affords to keep 75% of the tide amplitude as well as the fishing industry, the breed of mussels and oysters and above all, the unique eco-system of The Biesbosch.

One of the latest improvements of the Delta plan was the storm surge barrier in the New Waterway near Hoek van Holland built in 1997. It consists of two enormous doors mounted on swing arms that can be used to close the estuary if storm and high water requires in order protecting the country.