Long term piezometric data analysis to validate landslide models.

During the study of landslides dynamics, one fundamental moment is the definition of the model in describing the failure mechanism. In this context, the hydrological process knowledge is one of the most important element to validate the hypothesized model. The long term monitoring system provides us a powerful tool. In fact, annual or multi-annual piezometric series, together with displacement and other data, played a fundamental role on the landslide understanding. The analysis of different types of active landslide, stresses the importance of the knowledge of the hydrological conditions of the slopes before and after the remedial works, respectively to define and validate the landslide model and to asses the role of the remedial works on the stabilization of the landslide.