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Flood protection concept presented: Six retention basins are to protect against water masses

2021-10-21T12:06:20.298Z


Fürstenfeldbruck district - crossing rivers, flooded streets, torn away bridges, destroyed houses and livelihoods - the images of the effects of the floods, especially in North Rhine-Westphalia in July this year, are still deep in the bones.


Fürstenfeldbruck district - crossing rivers, flooded streets, torn away bridges, destroyed houses and livelihoods - the images of the effects of the floods, especially in North Rhine-Westphalia in July this year, are still deep in the bones.

In order to be prepared for such natural disasters, the AmperVerband commissioned the development of an “integral flood protection concept for the waters of Ascherbach, Gröbenbach and Starzelbach” four years ago. After all, almost 2,000 residential buildings and more than 2,500 commercial buildings are affected by a flood alone.


The contract was awarded to the planning association CDM Smith Consult and Arnold Consult, which presented its concept results on October 19th.

The mayors of the affected communities - Olching, Puchheim, Alling, Eichenau and Gröbenzell - and other mayors whose communities, such as Germering, were not directly affected, but had nevertheless agreed to support the project, were present.

Allings' mayor Stefan Joachimsthaler was also present as chairman of the AmperVerband and the mayor of Gilching, Manfred Walter, as his deputy.


First, important step

"Our study is an important first step in order to better protect the communities in the district from floods and heavy rain in the future," explained Heiko Nöll, a graduate engineer who was entrusted with the concept as the project manager. The study shows that for the greatest possible protection, six flood retention basins would have to be built at Puchheim-Ort, Eichenau, Alling and Germering. There is also a transition from the Starzelbach to the Gröbenbach, walls with a maximum height of between 50 centimeters and one meter in the town, and two throttle structures on the embankment of the S4 and on the B2 near Alling, because “the water of the streams must be stopped before it can can spread ”. Nöll made it clear that there was no alternative to the six planned flood retention basins.

The study included, among other things, the measures that would have to be taken for a so-called "flood of the century", i.e. at a level that, statistically speaking, is reached or exceeded once every 100 years, and there was a surcharge of 15 percent due to the consequences of climate change has been taken into account.


Four possible variants

Four possible variants were played through and compared with each other as part of the study, the Lower Nature Conservation Authority and the Water Management Office in Munich were on hand to provide advice.

Benefit-cost calculations were made for the individual variants.

The decision was finally made for a variant, the cost of which, according to the calculation, will amount to around 38 million euros, reported Nöll.

Here, however, a subsidy of up to 70 percent can be expected.


According to Nöll, the six retention basins now planned have a total volume of around one million cubic meters.

"But all the measures only work as part of the overall package," he clarifies.


As chairman of the AmperVerband, Joachimsthaler emphasized that the “concept was a good basis”, but that we should not rest on it, but rather advance the measures.

In the event of a flood, he did not want to have to explain to the citizens that a study had been carried out, but that it "disappeared in a drawer" without taking any further action.

These must now be implemented together.

For this purpose, one strives to found a special purpose association in order to be able to coordinate with one another.


Contact with the property owners as a key factor

In the eyes of the chairman of the association, the key factor is contact with the owners on whose properties the measures are to be implemented.

You have to get on board.

Most of the owners, with whom one has already made initial contact, are farmers.

Some of their properties are already fields that would be flooded in the event of a flood.

Management is still possible despite the implementation of the measures, emphasized Joachimsthaler.


The coordinative activities of the AmperVerband ended when the study was handed over to the participating municipalities on October 19.

Maximilian Geiger

Source: merkur

All news articles on 2021-10-21

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