ABSTRACT
The last hundred kilometres of the 2nd Vienna water supply pipeline run through several landslides of the Flysch zone. Thus the supply system is constantly monitored by the municipal board of control (MA 31). Twice a year, after having been emptied the pipelines are checked for any new cracks, which are immediately repaired if necessary. Inside the pipelines convergence indicators have been installed in order to determine the deformations of the structure. Investigations by Finite-difference models (UDEC) were used as the basis for determining the stability and the operational safety of the 2nd Vienna water supply pipeline.
