Bike Touring Highlight
The weir was built between 1869 and 1873. It regulates the water level of the Elbe at low tide, and prevents the outflow of the Elbe water into the glacial valley of the Elbe, and regulates the outflow during flooding into the glacial valley, as protection for the cities of Magdeburg and Schönebeck.
June 9, 2017
is a weir for flood protection in the cities of Magdeburg and Schönebeck (Elbe) near the village of Pretzien.
The weir is located at the head of the Elbe circulation channel and blocks it when not in use. The Umflutkanal was partly laid through the old Elbe and can largely bypass 30% of the floods via Biederitz to the east of the cities of Magdeburg and Schönebeck. So far the weir has been drawn 63 times, 54 times in winter and 8 times in summer. After opening in March 2006, the weir was open from January 15-29, 2011. The opening took 5 hours, 16 employees were required.
The last opening of the weir in the vicinity of the flood in 2013 in Central Europe took place on the afternoon of June 3, 2013.
October 12, 2015
The Elbe runs at the height of the Pretziener weir in a glacial valley six to eight kilometers wide, in which the course of the river would change constantly without human intervention, forming meanders. Before the 10th century, the Elbe ran along a ridge from Dornburg to Hohenwarthe on the eastern edge of the glacial valley. In the following centuries the Elbe shifted west towards Schönebeck and Magdeburg. An interim river course from Ranies via Grünewalde and Randaunach Salbke has been preserved as the Old Elbe. 
A suggestion for the construction of a circulation channel was contained in the memorandum in the so-called Elbenauer dyke regulation case from 1865, which was created with the significant participation of the Prussian civil engineer Hermann Wurffbain (1804-1889). The canal should follow the old course of the Elbe on the eastern edge of the glacial valley. The drainage through the canal should be regulated by a fixed weir at pretzias.
July 7, 2019
The weir was to prevent the outflow through the old Elbe at low and medium water, which also benefited the Elbe shipping. Smaller floods should flow out over the Elbe, which allowed more intensive agricultural use of the areas in the Umflutkanal. In the event of major flood events, the canal should relieve the Elbe and thus protect the cities of Magdeburg and Schönebeck. A law on the construction of weirs and canals was passed in July 1868. In 1869 the plans were modified in such a way that the Pretzien weir was to be built as a mobile weir. 
Construction of the circulation channel began in 1869; In 1873 it was largely completed. The foundations of the weir were created in 1871; In 1875 the weir was ready for use.
July 7, 2019
Little is known about the construction work, as there are no contemporary publications. The proportion of manual labor was presumably high. The overall project, which was headed by Hermann Wurffbain, also involved 3000 French prisoners of war from the Franco-Prussian War.
July 7, 2019
The paths are 80-90% very well developed. Asphalt road, concrete paths or gravel. Only very short pieces of field and meadow paths or cobblestones. In Schönebeck you have to be careful not to lose your way. There you should always follow the dike path and not drive to the Elbe (see map). The ferry times must also be observed and it will be difficult even in low water!
May 23, 2020
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