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Zuiderzee project : ウィキペディア英語版
Zuiderzee Works

The Zuiderzee Works ((オランダ語:Zuiderzeewerken)) are a man-made system of dams and dikes, land reclamation and water drainage works, in total the largest hydraulic engineering project undertaken by the Netherlands during the twentieth century. The project involved the damming of the Zuiderzee, a large, shallow inlet of the North Sea, and the reclamation of land in the newly enclosed water using polders. Its main purposes are to improve flood protection and create additional land for agriculture.
The American Society of Civil Engineers declared these works, together with the Delta Works in the South-West of the Netherlands, as among the Seven Wonders of the Modern World.
==Background==
The concept of making the Zuiderzee docile originated in the seventeenth century. The ambitious solutions suggested were impractical given the technology then available.
Plans were developed during the second half of the nineteenth century to protect areas from the force of the open sea and creating new agricultural land. Cornelis Lely (after whom Lelystad is named) was an ardent supporter, an engineer and later government minister. His 1891 plan was the basis for the development of what were to become the Zuiderzee Works. It consisted of a large dam connecting the northern tip of North Holland with the western coast of Friesland and the creation of initially four polders in the northwest, the northeast, southeast (later split in two), and southwest of what would be renamed the IJsselmeer (IJssel-lake). Two major lanes of open water were defined for shipping and drainage. The initial body of water affected by the project was . Opposition came from fishermen along the Zuiderzee who would lose their livelihood, and from others in coastal areas along the more northerly Wadden Sea. They feared higher water levels as a result of the closure. Other critics doubted whether the project was feasible financially.
When Lely became Minister of Transport and Public Works in 1913, he used his position to promote the Zuiderzee Works and gained support. The government started developing official plans to enclose the Zuiderzee. On January 13 and 14, 1916 the dikes at several places along the Zuiderzee broke under the stress of a winter storm, and the land behind them flooded, as had often happened in previous centuries. This flooding provided the decisive impetus to implement the existing plans to tame the Zuiderzee. In addition, a threatening food shortage during the other stresses of World War I added to widespread support for the project.
On June 14, 1918 the Zuiderzee Act was passed.〔(【引用サイトリンク】work=Nieuwlanderfgoed )
The goals of the Act were threefold:
*Protect the central Netherlands from the effects of the North Sea;
*Increase the Dutch food supply by development and cultivation of new agricultural land; and
*Improve water management by creating a lake from the former uncontrolled salt water inlet.
The ''Dienst der Zuiderzeewerken'' (Zuiderzee Works Department), the government body responsible for overseeing the construction and initial management, was set up in May 1919. It decided against building the main dam first, proceeding to construct a smaller dam, the ''Amsteldiepdijk'', across the Amsteldiep. This was the first step in rejoining the island of Wieringen to the North Holland mainland. The dike, with a length of 2.5 km, was built between 1920 and 1924. As with dike building, polder construction was tested on a small scale at the experimental polder at Andijk.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Zuiderzee Works」の詳細全文を読む



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