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old town the Oker divides into the western and eastern bypass channels (Umflutgraben) which circumnavigate the historic city centre at a slightly higher level. These channels were laid in the 16th century as the external moats of the town's defences. The actual course of the Oker through the centre of the town was covered and, today, runs through pipes emerging again north of the old town. The water level in the city area is controlled by the St. Peter's Gate Weir (Petritorwehr) in the western and the "Wends

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