Twenty-year monitoring of the Orvieto overconsolidated clayey slope (Italy)

In addition to landslides of different types and extent, the clayey slope of the Orvieto hill is affected by extremely slow movements at relatively high depths (up to 33 m) and by very slow movements at shallower depths (up to 10 m). These movements are strictly related to rainfall regimes and to the consequent pore pressure distribution inside the hill. The influence of rainfall regimes on the hydraulic conditions and movement rates was reconstructed by means of piezometric and inclinometric measurements performed over the last twenty years.