After the withdrawal of huge amounts of water in Vienna’s river Winflus, the City Secretariat for Water of Vienna analyzed the existing data. According to current information, a thousand-year flood occurred on the Vinflus river over the weekend. Greater damage in the city area was prevented thanks to the huge retention basins that Vienna has. In the west of Vienna in the Auhof area there are six such pools with a total capacity of 1,160,000 m3. During heavy rainfall, the water is retained in the basins and later released in a controlled manner. This requires a lot of experience and skill from the employees of the Secretariat for Water. Currently, together with experts, an analysis is being made of where there is still potential for improving flood protection on the Vinflus River.
The Vinflus springs in the western part of the Vienna Forest. On its way of about 15 kilometers, it passes through a total of nine Viennese municipalities and flows into the Danube Canal near the Urania building. The river basin is geologically located in the so-called in the flysch zone of the Vienna Forest. Due to the composition of clay and stone, the base has a low water permeability, which is why the water level in the Vinflus river rises quickly during heavy rainfall and can reach the top of the walls and the subway line. At the turn of the 19th and 20th centuries, the river was regulated to improve the city’s flood protection. Under normal conditions, the river has a flow of about 200-500 liters of water per second. During floods, this amount can rise to over 440,000 liters of water per second.
The Auhof pools were built as a key part of the regulation of the Vinflus between the 13th and 14th Viennese municipalities and protect the city of Vienna from rapid flood waves. In the event of floods, excess water is temporarily held in basins to prevent spillage over the banks of the river in the urban area. The last time the level of the river was at the same level as last week in 1951. Flood protection with the Danube Island and the Neudonau canal as a discharge channel worked perfectly during the current flood, said the head of the water secretariat, Gerald Lev. The entire system of dams in and around Vienna is designed for a flow capacity of up to 14,000 cubic meters of water per second, which is approximately the largest flood ever recorded in Central Europe in 1501. Normally, about 2,000 cubic meters of water per second flows through Vienna at the average water level. The current flood of the Danube corresponds to a flood that occurs once in 50 to 70 years with a flow of about 10,000 cubic meters of water per second.
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