Construction of a snow retention basin in an Alpine sagging mass

This contribution deals with the construction of a snow retention basin (for manufacturing snow) in the ski region Shuttleberg Flachauwinkl-Kleinarl/Salzburg in a sagging mass movement. In the design stage it was not known whether deformations of the mass movement have to be expected and if so to what amount. Therefore probable scenarios of deformation rates of the mass movement were considered in the design and measurement equipment have been installed in order to observe the behaviour of the construction. First results of the observational system will be presented and discussed after a life time of about two years of the construction.