In heavy rain, torrents can swell into raging torrents and flood an entire place.
Bayrischzell is planning more flood protection to prevent this from happening.
Bayrischzell
- Protection against flooding is also an issue in mountain villages: when mountain streams swell into torrential currents due to heavy rain or local super thunderstorm cells and break into the valley.
In 2013, such an extreme weather event also hit Bayrischzell.
In order to prepare for the future, the municipal council decided in a fundamental decision in 2015 that flood protection should be taken into account in the budget in the future.
In the most recent meeting, the Rosenheim Water Management Office presented its feasibility study on flood protection at the local Mühlleitengraben and Wendelsteinbach and Larchbach.
In the future, the aim is to protect the affected built-up buildings from the torrents in the village in the event of a flood, reported Mayor Georg Kittenrainer (CSU).
Expert Christoph Kaindl therefore gave an overview of the expansion and costs that the Wendelstein community will face.
There were around two dozen flood events in Bayrischzell between 1955 and 2013, Kaindl described.
Using “hydraulic calculations”, he showed how a potential flood of the century would run through Bayrischzell.
In particular, the donut meadow on Alpine road 307 is colored dark blue on the graphic.
Construction measures that widen the runoff cross-section of the streams using a trapezoidal profile and additional stone protection walls "to prevent overflows" should help.
The expansion is to begin on the Wendelsteinbach, which flows close to the new family hotel "Das Bayrischzell".
Even before construction began, the water management authority negotiated the concept for the planned flood protection with the hotel operator.
There, "the channel must be enlarged, made deeper and channeled with concrete walls," said Kaindl, who also emphasized: "The tree population there remains."
The next section concerns the Mühlleitengraben, which runs underground from the Lehrer-Vogl-Straße through pipes and flows into the Wendelsteinbach.
To protect it, the route will be partially changed in order to pull in larger pipes for more water passage.
In contrast, the construction work at the confluence point, where the Wendelsteinbach and Larchbach (Ganglbach) meet, is more complex.
“That gave us a headache,” confessed Kaindl.
Kittenrainer added, “We have tested everything in the area of this needle eye”.
As a solution, the water management office is now proposing to relocate the river mouth there.
Reason: Part of the Larchbach flows under the Hotel Königslinde and makes enlargement impossible.
It is necessary to create a new channel as a concrete passage, away from the hotel to Michael-Meindl-Straße.
The bridge on Schlierseer Straße is also in need of renovation.
As part of the measure, the municipality is also having a look at whether the bridge needs to be renewed.
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Last but not least, the creek bed on Seebergstrasse will be enlarged in the direction of the underpass on the Alpenstrasse and protected by an elevated dam on the footpath on the east side.
The opposite bank to the Krapfen, on the other hand, remains untouched, "because the trees there are characteristic of the location and this should be preserved".
In addition, the meadow serves as a "catch basin" for possible flooding.
However, the parking spaces on the street have to give way.
"Except for three of them, they fall victim to expansion," explained Kaindl.
In the next step, the water rights decision must be approved by the district office, only then is the water management office authorized to implement it.
The Free State bears the current planning costs of 215,000 euros.
The total construction costs of 3.2 million, on the other hand, are shared between the municipality and the state.
Thus the municipality of Bayrischzell would have to raise almost one million euros itself.
Kittenrainer: “The flood protection project is important.
But it's also a mammoth project for us. "