Covering of the Senne

The covering of the Senne (French: Voûtement de la Senne, Dutch: Overwelving van de Zenne) was the covering and later diverting of the main river of Brussels, and the construction of public buildings and major boulevards in its place. It is one of the defining events in the history of Brussels.

The Senne/Zenne (French/Dutch) was historically the main waterway of Brussels, but it became more polluted and less navigable as the city grew. By the second half of the 19th century, it had become a serious health hazard and was filled with pollution, garbage and decaying organic matter. It flooded frequently, inundating the lower town and the working class neighbourhoods which surrounded it.

Numerous proposals were made to remedy this problem, and in 1865, the mayor of Brussels, Jules Anspach, selected a design by architect Léon Suys to cover the river and build a series of grand boulevards and public buildings. The project faced fierce opposition and controversy, mostly due to its cost and the need for expropriation and demolition of working-class neighbourhoods. The construction was contracted to a British company, but control was returned to the government following an embezzlement scandal. This delayed the project, but it was still completed in 1871. Its completion allowed the construction of the modern buildings and boulevards which are central to downtown Brussels today.

In the 1930s, plans were made to cover the Senne along its entire course within the greater Brussels area, which had grown significantly since the covering of the 19th century. The course of the Senne was changed to the downtown's peripheral boulevards. In 1976, the disused tunnels were converted into the north-south axis of Brussels' underground tram system, the premetro. Actual purification of the waste water from the Brussels-Capital Region was not completed until March 2007, when two treatment stations were built, thus finally cleansing the Senne after centuries of problems.

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