AbstractRainfall simulation is a technique which aids, under controlled conditions, the understanding of a part of the processes involved in water erosion. Simulation requires, that the relevant characteristics of natural rainfall be closely reproduced. Physical limitations and conflicting conditions obstruct the realization of a correct reproduction of all characteristics belonging to different kinds of natural storms.A laboratory rainfall simulator, EROS MII, of the tubing type is under construction. The simulator is composed of 8 plexiglass boxes (50 × 50 × 5 cm) producing rainfall intensities between 1 cm/h and 15 cm/