The silting process of reservoirs limits their use. Predicting this process is important for economic reasons. The paper assesses the possibility of using the methods of forecasting the silting process developed in studies of small Polish reservoirs to determine this process in reservoirs in other geographical regions. This analysis covers the Dachwig and Ohra reservoirs, located in Thuringia, Germany. The forecast of silting was developed using the Gončarov formula according to the guidelines in force in Poland and following the empirical formula used to calculate the average annual silting. It allowed determining the rate of silting. Based on the results of calculations using the Gončarov formula, it was found that the degree of silting after 100 years of operation of the Dachwig and Ohra reservoirs will be 2.45% and 0.001%, respectively. The average annual silting rate calculated from these data was found to be lower than that calculated using the empirical formula. The limitation of the empirical formula is also the reason for obtaining higher values of the average annual silting degree, which was developed in studies of reservoirs with capacities smaller than 3.86 million m3. Thus, for the 2.1 million m3 Dachwig reservoir, a difference of 43% in results was obtained, while for the much larger 17.5 million m3 Ohra reservoir, results differing by as much as three times were obtained.