In this condition, the challenge is the selection of interventions that offer the lowest cost-benefit ratios in relation to the nature and kinematics of the instability, engineering and economic feasibility, and social and environmental acceptability (Popescu 2001 2002 Popescu and Seve 2001 Galve et al. On the other hand, they often do not have sufficient economic means to restore all the situations. On one hand, they need to restore the safety conditions in as many landslides as possible in the shortest time possible. In the areas where very exceptional rainy events have caused the contemporaneous triggering of a large number of slope instabilities, the administration working for soil protection has to face a difficult challenge. Two stabilization scenarios are studied through an FE model: the first includes the stabilization system built in 2015, while the second evaluates a new solution proposed to further increase the slope stability. This allows the evaluation of benefits achieved with the reinforcements and, at the same time, the assessment of additional improvements.

Thanks to a monitoring system installed in the meantime, it is now possible to have a comparison between the site conditions before and after the intervention. In 2015, some floating composite anchors were installed to slow down the movement, even if, due to a limited budget, they were not enough to ensure the complete stabilization of the slope. The case study is the landslide of Cischele, a medium landslide which occurred in 2010 after an exceptional heavy rainy period.

The observational method prescribes designing an intervention and, at the same time, using a monitoring system in order to correct and adapt the project during realization of the works on the basis of new data acquired while on site. This work concerns the application of this technique according to the observational method described within the Italian and European technical codes and mainly recommended for the design of geotechnical works, especially when performed in highly uncertain site conditions. Floating composite anchors are an innovative and low-cost technique set up for slope stabilization: it consists in the use of passive sub-horizontal reinforcements, obtained by coupling a traditional self-drilling bar with some tendons cemented inside it. In this regard, the research for more economically sustainable solutions is a crucial challenge. Even if there are no casualties, the economic losses are often significant, and municipalities frequently do not have sufficient financial resources to repair the damage and stabilize all the unstable slopes. A large number of landslides occur in North-Eastern Italy during every rainy period due to the particular hydrogeological conditions of this area.

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