As of: February 29, 2024, 10:14 a.m
By: Stefanie Zipfer
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The surfing wave in the chic new Mühlbachviertel will probably always remain just a “vision”.
The owner of the former MD site describes his plans for the exposed Mühlbach as such.
© Visualization: Quarterback Munich GmbH
The water management office wants the Amper to carry more water in the future.
This has massive consequences for the city and especially for the former MD site.
Because: More water in the Amper means less water in the Mühlbach.
There will probably not be a surfing wave like the MD investor had planned.
Dachau
– In autumn 2021, a unique department was founded at TSV Dachau 1865: a surfing department.
This sport, TSV chairman Wolfgang Moll said at the time, had “more or less swam towards us”.
Although the large district town is neither on the sea nor on a lake, he and his club colleagues were convinced that they were riding the right wave with the project.
After the most recent meeting of the city council's Environment and Transport Committee on Tuesday, it is clear that the Dachau surfers will probably have to go to Munich's Eisbach in the future to practice their sport.
The dream of surfing on an artificial wave on the Mühlbach, which will be exposed in the future in the newly developed MD area - which will then even be called Mühlbachviertel - is probably over.
Reason: The water management office has informed the city that the Amper will probably be affected more and more often by low water levels due to the climate.
In order to prevent the associated ecological damage, the city must - in layman's terms - give the Amper right of way over the Mühlbach in the coming years.
The previous practice of tapping five cubic meters of water per second from the Amper at the Amper stage and directing it towards Mühlbach is now banned.
Mayor Florian Hartmann reported to the city councilors that the water management office had summarized the matter as follows: “The Amper is more important than the Mühlbach, we have to keep more water in the Amper.”
The most obvious solution: simply shut down the mill stream
Hartmann's first thought when he received this message from Munich: “Then we'll shut down the stream completely.
That would be the cheapest solution.” But, as the municipal utilities and city administration explained, completely shutting down the stream is not possible.
On the one hand, because the Mühlbach is not only a so-called technical body of water, but also has ecological significance: parts of the stream are mapped as a biotope and there are fishing rights.
In addition, and this is the much more important reason: the stream serves as a so-called receiving water for many storm water canals and also for a rain overflow basin in the Dachau mixed water network.
Shutting down the two-kilometer-long stream, filling the stream bed and then building canals would cause “enormous costs.”
But continuing to operate the Mühlbach with less water will also mean a huge effort for the city.
The correct water mixing ratio in the storm overflow basin could also be ensured if instead of five, only two cubic meters of water per second were fed from the Amper into the Mühlbach.
However, according to the administration, the significantly lower water level of the stream would have “negative influences on the adjacent buildings or even the old town hill”.
In the mayor's words: "There is a risk that the slope will dry out and start to crumble."
The goal: to keep the water level at its current level
The aim of all future efforts must therefore be to maintain the water level compared to the current one, even if the flow rate of the Mühlbach is only constant at two cubic meters of water per second.
How this can be solved structurally - for example by raising the stream bed - and above all at what cost, will now be found out through a feasibility study.
The city councilors unanimously gave their approval to the administration.
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For the future Mühlbachviertel, the shrinkage of the stream not only means that the planned artificial surfing wave, which young people in particular longed for, is no longer possible.
The planned width of the exposed stream, namely six meters, will also not be sustainable;
the administration still expects only two meters.
And as of today, no one can answer the investor's question of how big or small the future underpass structures need to be planned for the Mühlbach.
The question of how long the mill stream conversion will take and what it will cost cannot be answered either.
What is certain is that the city will try to get funding, as building authority manager Moritz Reinhold emphasizes.
And: If the city soon agrees on a timetable for the renovation and the necessary planning approval process at the district office runs “smoothly”, it is at least “not unrealistic that construction can be completed in four to five years”.
By the way: Everything from the region is now also available in our regular Dachau newsletter.