Extreme slope with AGRU HDPE geomembrane

Ischgl is an internationally renowned ski resort in the Silvretta Mountains in Tyrol. In order to guarantee absolute snow reliability, artificial snow-making is also required here. The new reservoir Viderböden with a volume of approx. 60,000 m³ was completed in October 2017 and completely lined with AGRU geomembranes.

reservoir tyrol viderboeden ischgl agru hdpe geomembranes
copyright - Tourismusverband Paznaun – Ischgl

Starting situation

The new reservoir Viderböden is the "heart" of the snowmaking system, which is operated by the Silvrettaseilbahn AG. Due to landslides, the location of the existing storage pond had to be abandoned.  The Silvrettaseilbahn AG was looking for a new, geologically secure section to create a new water storage tank.

Implementation

This should be as close as possible to the previous location to connect the lines without long distances and from there to be able to initiate the water into the extensive network of the existing system without unnecessary earthworks. The Viderböden were outstandingly suitable for this purpose and in just three and a half months of construction, a heart-shaped reservoir with a sealing system consisting of a HDPE waterproofing membrane in accordance to Austrian Standard (ÖNORM) S 2073, protective fleece and gravel cover was created. One challenge was the large slope angle, which was actually only be achieved with the AGRU HDPE geomembrane. With a steep embankment, the end customer can "store" more volumes of water on the available surface and thus produce more artificial snow.  Therefore, MICROSPIKE HighGrip waterproofing membranes were used. This structured geomembrane has ≥20.000 knobs / m², making it the ideal solution for steep slopes in combination with protective or drainage pathways. A knob-free welding area facilitated the installation. In addition, the material was energetically enriched (BIO +) in order to reduce the growth of algae and to start snowmaking at higher temperatures.

AGRU HDPE geomembranes installation

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