Add to ORKGQuantitative forecasting of pore water pressures in response to extreme precipitation is a new field of research. Knowledge of maximal pressures to be expected is essential, however, for the construction of slopes with long-term stability. The overburden dumps of former lignite mines are highly inhomogeneous and anisotropic, making forecasting very difficult. This project aimed at quantifying maximal pore water pressures for extreme precipitation with a recurrence period of onehundred years, as a calculation base for the geotechnical experts. Pore water pressures, precipitation and water levels in the dumps of the Zwenkau mine near Leipzig were measured through two years. The data were analysed by time series methods, including Fourier-tran...