Brienz has recently been in the international headlines because the village was threatened by a landslide that could have buried it. Little is known outside Graubünden that the village itself stands on unstable rock and is sliding down the valley at increasing speed. An area of around three square kilometers is shifting by more than one meter a year.
Experts assume that increased water pressure in the subsoil is the main cause of the slide movement. The drainage tunnel is intended to reduce this pressure and greatly reduce the sliding speed of the village in the long term. Ideally, this would also have a positive effect on the rock masses on the mountain above the village, which are in danger of falling. A 635 meter long exploratory tunnel that has already been created has exceeded the expectations of the geologists involved. The sliding movement over this tunnel was almost halved.
The drainage tunnel that has now been approved is a 1.65-kilometer extension of the exploratory tunnel, resulting in a drainage system that is 2.28 kilometers long. From this, more than 100 drainage bores are also created. The tunnel itself will be almost five meters high and can be driven on by trucks. A construction period of 42 months is planned for the construction of the drainage tunnel with drainage. The earliest possible start of construction is March 2024.
2023-07-14 20:47:26
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