History
During the early Middle Ages the river was considered to be the continuation of the Merwede river (itself a distributary branch of the Rhine) and was named accordingly. However, during the 13th century a series of floods forced the Maas to shift its main course north towards the Merwede. From then on, several stretches of the original Merwede were named Maas instead and served as the primary outflow of that river. Those branches are currently known as the Nieuwe Maas and Oude Maas. For several centuries the Nieuwe and Oude Maas were considered part of the Maas delta. Near Vlaardingen, these two met and then split again at the island of Rozenburg: the north branch was known as Het Scheur and the south branch as either Nieuwe Maas or Brielse Maas because it flowed close to Brielle. Het Scheur and the Brielse Maas then met again to form an estuary known as Maasmond ("Mouth of Meuse").
However, during another series of severe floods the Maas found an additional path towards the sea, resulting in the creation of the Biesbosch wetlands and Hollands Diep estuaries. Thereafter, the Maas split near Heusden into two main distributaries, one flowing north to join the Merwede, and one flowing directly to the sea. This diminished the influence of the Maas on the Oude and Nieuwe Maas distributaries. The branch of the Maas leading directly to the sea eventually silted up, (and now forms the Oude Maasje stream), but in 1904 the canalised Bergse Maas was dug to take over the functions of the silted-up branch. At the same time, the branch leading to the Merwede was damned at Heusden, (and has since been known as the Afgedamde Maas) so that little water from the Maas now enters the old Maas estaury, or the Rhine distributaries. The resulting separation of the rivers Rhine and Maas is considered to be the greatest achievement in Dutch hydraulic engineering before the completion of the Zuiderzee Works and Delta Works. Since then, the vast majority of the flow of the Oude and Nieuwe Maas come from the Rhine, and not the Maas.
With the completion of the Nieuwe Waterweg, the Brielse Maas no longer reaches the sea as a primary outflow for the river Rhine. The Brielse Maas section was dammed off from Het Scheur in the middle of the 20th century (now forming Briel Lake), forcing all waters to flow through the artificial Nieuwe Waterweg.
Read more about this topic: Nieuwe Maas
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