As of: February 17, 2024, 9:00 a.m
By: Christiane Mühlbauer
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The helicopter team is able to deposit one ton of material into the Kochelsee outflow with centimeter accuracy per flight.
A total of 1,000 tons of gravel and 2,000 tons of hydraulic stones are processed. Photos: Pröhl (2) © arp
A construction site on the banks of Lake Kochel has already attracted a number of onlookers in the past few days.
Here, Uniper, as the operator of the Walchensee power plant, is renovating a stone threshold.
Kochel am See – The helicopter flew again and again on Thursday and Friday at Kochelsee.
It was not yet clear on Friday whether he would still be in action on Monday.
“It depends on how far the work progresses,” said Theodoros Reum Schüssel, press spokesman for the German hydropower division at Uniper, in an interview with our newspaper on Friday morning.
The focus of the work is a stone threshold in the area where the Kochelsee flows into the Loisach.
This threshold has become “leaky” over the past few decades; in technical jargon this is referred to as circumferentiality.
“That means the water flows past it,” explains Reum Schüssel.
The threshold is important in order to reliably control the water level of the Kochelsee.
Incidentally, this not only happens via the natural Loisach outflow, but also via the shorter Loisach bypass canal that flows next to it.
The time for the work is now good
For the power plant operator Uniper, the timing for this work is now good because renovation work is currently taking place in the Wolfratshausen area on the Loisach-Isar Canal (we reported).
“As a result, there are restrictions on water drainage to the north anyway,” explains Reum Schüssel.
In consultation with all authorities, the water level of Lake Kochel has currently been reduced to the minimum level.
The work will take around six weeks and cost 500,000 euros.
After completion, Uniper promises that everything will be renatured again.
© arp
Now building material is placed in the area of the threshold for sealing.
“It involves sand, larger gravel and large hydraulic stones.” It is arranged in such a way that the threshold serves its purpose again without any problems for several decades.
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Because it is an ecologically sensitive reed belt, which, according to Reum Schüssel, is relevant as a breeding area, the building material is brought in specifically by helicopter.
“The helicopter deposits the cargo at the exact spot,” said the press spokesman.
One ton of material is transported per flight.
A total of 1,000 tons of gravel and 2,000 tons of hydraulic stone are processed.
At the same time, washouts, so-called scour damage, are repaired below the stone threshold.
A construction road was set up here in the form of a gravel strip on which trucks and a walking excavator drive.
There are no ecological difficulties in this area, says Reum Schüssel.
When the construction work is finished, the gravel road will be added to the Loisach as bedload.
Why were trees cut down?
One reader of our newspaper was very upset that trees were felled in this area in the past few days.
As Reum Schüssel explains, four pollard willows were cut back to the torso and - at the request of the Palaces and Lakes Administration, which owns one of the two properties on which the construction work is taking place - some ash trees that had already been marked.
“These were affected by ash shoot dieback,” says Reum Schüssel.
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It can be assumed that the pollard willows will sprout again.
“We only cut trees and trees in consultation with the authorities,” emphasizes the press spokesman.
Cuts have safety reasons for the workers.
The press spokesman said the renovation would take a total of six weeks.
It costs around 500,000 euros.
“When we’re finished, everything will be renatured,” says Reum Schüssel, also referring to the current storage areas for the building materials.