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The proposed model is a stochastic generator of rainfall coupled to an empirical model of rainfall erosivity. It is calibrated on a 15-year historical pluviographic database. Our objective is to develop a probabilistic simulator that would permit the study of the erosive consequence of rains in time, while accumulating the effects over several years of the erosivity of consecutive rain spells, which are supposed to be proportional to the land erosion, or to the suspended solid transport during the same period. This generation can be made over several years, and would permit us to avoid being constrained by sample size. The methodology is being used operationally, to reconstruct very long sets of rainy episodes with the objective of studying the cumulative effects of their erosivity in time. This approach can be seen as complementary to experimental approaches, reinforcing them and permitting to obtain a better insight into the problem area of erosion.