This dataset contains the results of a case study analysing the potential impacts of a compound meteorological extreme event on the protective forest in the Val Mesolcina. These impacts were assessed in an experts survey. 29 Experts from practice, administration and science estimated the probabilities for a loss of the protective function due to a drought-related compound extreme event based on different hazard scenarios. The experts not only assessed these probabilities but also provided estimates about the reliability of the scenarios, other socio-economic consequences and options for adaptation. This dataset contains the following information: - Table with all (anonymised) answers from the survey - Factsheets summarising the results and methods in German, French and Italian - A detailed description of the study site and survey instructions - Link to the project website wit illustrations for each individual question of the survey