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problem. Centuries of extensive and poorly controlled peat extraction lowered an already low land surface by several metres. Even in flooded areas, peat extraction continued through turf dredging. Because of the flooding, farming was difficult, which encouraged foreign trade, the result of which was that the Dutch were involved in world affairs since the early 14th/15th century.[97] A polder at 5.53 metres below sea level 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" ("water boards") 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 continue to exist. 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 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 ("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.[99][100] The Netherlands is one of the countries that may suffer most from climate change. Not only is the rising sea a problem, but erratic weather patterns may cause the rivers to overflow.[101][102][103] Delta Works Main articles: Delta Works and Flood control in the Netherlands The Delta Works are located in the provinces of South Holland and Zeeland. After the 1953 disaster, the Delta Works was constructed, which is a comprehensive set of civil works throughout the Dutch coast. The project started in 1958 and was largely completed in 1997 with the completion of the Maeslantkering. Since then, new projects have been periodically started to renovate and renew the Delta Works. A main goal of the Delta project was to reduce the risk of flooding in South Holland and Zeeland to once per 10,000 years (compared to 1 per 4000 years for the rest of the country). This was achieved by raising 3,000 kilometres (1,864 mi) of outer sea-dikes and 10,000 kilometres (6,214 mi) of inner, canal, and river dikes, and by closing off the sea estuaries of the Zeeland province. New risk assessments occasionally show problems requiring additional Delta project dike reinforcements. The Delta project is considered by the American Society of Civil Engineers as one of the seven wonders of the modern world.
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