Direct and indirect evaluation of denudation rates in Central Italy

Denudation processes are likely to occur discontinuously. They show a step-like trend with time and are triggered by rainfall events distributed over a number of consecutive days, though not greatly intense. Particularly, their amount should overcome the threshold of 60 mm per 5 consecutive days. Below this threshold the surface runoff does not seem to reach the power necessary to induce significant modifications of the topographic surface in the study area.