Edafología. Volumen 7-3. Septiembre 2000. pág 83-92.
Rainfall erosivity constitutes an important factor for the understanding of the geomorphological processes that are taking place in a territory. However, it is a parameter difficult to estimate in many places, due to the lack of the necesssary pluvimetric records. It is accepted that the modified Fournier index or the Precipitation Concentration index are good indices of the erosive power of the rainfall, and of the monthly rainfall variability.
The mapping of the mentioned rainfall indices shows the distribution pattern of the erosion risk in the Campo de Gibraltar. In this area, the erosion risk seems to be related with factors like the humid wind blowing from the sea, the aspect of the hillsides or the topography.
The superficial and monthly distribution of the rainfall erosivity shows a heterogeneous pattern, with two maximum erosion risk points (February and December), specially important in the mountains and sharp areas, and a stable period in the dry months.
KEYWORDS. Rainfall erosivity, soil erosion risk, Fournier index, Precipitation Concentration index