**7. Conclusions**

A workflow to design, parameterize and validate a hydromechanical model using various data sources from site characterization, monitoring and laboratory tests was presented. Through the combination of complementary data sources, a detailed numerical model was implemented despite the site heterogeneity. Monitoring with point-scale sensors revealed

small scale heterogeneity in the hydraulic properties of the upper soil layer, which was not resolved during site characterization. This heterogeneity had minor influence on the slope stability analysis as it is dominated by slope and bedrock topography as well as initial conditions. The multiple data sources and the presented model can be extended towards a model-centered early warning system as well as towards an early warning system based on multiple data streams with thresholds defined through the model.

**Author Contributions:** Conceptualization, S.M., T.H., A.K. and J.A.H.; methodology, S.M., T.H., J.B., T.G., A.K. and J.A.H.; software, S.M., T.H., J.B., T.G.; validation, S.M., T.H., J.B., T.G., A.K. and J.A.H.; formal analysis, S.M., T.H., J.B., T.G., A.K. and J.A.H.; investigation, S.M., T.H., J.B., T.G., A.K. and J.A.H.; resources, A.K. and J.A.H.; data curation, S.M., T.H., J.B., and T.G.; writing—original draft preparation, S.M., T.H., J.B., and T.G.; writing—review and editing, S.M., T.H., A.K., and J.A.H.; visualization, S.M., T.H., J.B. and T.G.; supervision, A.K. and J.A.H.; project administration, A.K. and J.A.H.; funding acquisition, A.K. and J.A.H. All authors have read and agreed to the published version of the manuscript.

**Funding:** We thank the Federal Ministry for Science and Education of Germany for funding of the Project CMM-Slide through the GEOTECHNOLOGIEN initiative under contract 03G08498.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data presented in this study are available on reasonable request from the authors.

**Acknowledgments:** We thank the Geobasis NRW for providing us with the digital elevation model. We thank Matthias Leschinski and Constanze Reinken for their support with the seismic analysis and Ansgar Weuthen and Bernd Schilling for the installation and maintenance of the soil water content sensor network.

**Conflicts of Interest:** The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.
