The areas of the Netherlands that are above sea level Over the centuries, the Dutch coastline has changed considerably as a result of human intervention and natural disasters. Most notable in terms of land loss is the 1134 storm, which created the archipelago of Zeeland in the southwest.

On 14 December 1287, St. Lucia's flood affected the Netherlands and Germany killing more than 50,000 people in one of the most destructive floods in recorded history.[28] The St. Elizabeth flood of 1421 and the mismanagement in its aftermath destroyed a newly reclaimed polder, replacing it with the 72-square-kilometre (28 sq mi) Biesbosch tidal floodplains in the south-centre. The last major flood in the Netherlands took place in early February 1953, when a huge storm caused the collapse of several dikes in the southwest of the Netherlands. More than 1,800 people drowned in the ensuing inundations. The Dutch government subsequently decided on a large-scale program of public works (the "Delta Works") to protect the country against future flooding. The project took more than thirty years to complete.

The disasters were partially increased in severity through human influence. People had drained relatively high lying swampland to use it as farmland. This drainage caused the fertile peat to compress and the ground level to drop, whereby they would lower the water level to compensate for the drop in ground level, causing the underlying peat to compress even more. The problem remains unsolvable to this day. Also, up until the 19th century peat was mined, dried, and used for fuel, further adding to the problem.

To guard against floods, a series of defences against the water were contrived. In the first millennium AD, villages and farmhouses were built on man-made hills called terps. Later, these terps were connected by dikes. In the 12th century, local government agencies called "waterschappen" (English "water bodies") or "hoogheemraadschappen" ("high home councils") started to appear, whose job it was to maintain the water level and to protect a region from floods. (These agencies exist to this day, performing the same function.) As the ground level dropped, the dikes by necessity grew and merged into an integrated system. By the 13th century, windmills had come into use in order to pump water out of areas below sea level. The windmills were later used to drain lakes, creating the famous polders.

In 1932, the Afsluitdijk (English "Closure Dike") was completed, blocking the former Zuiderzee (Southern Sea) from the North Sea and thus creating the IJsselmeer (IJssel Lake). It became part of the larger Zuiderzee Works in which four polders totalling 2,500 square kilometres (965 sq mi) were reclaimed from the sea.

Delta works

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