There is evidence that, between hydrological years 1931/2 and 1990/1,
rainfall changed in the Algarve. There was an annual rainfall increase
(+9%) and a 7% increase in rainfall during the rainy period (October
to February). Both trends were statistically confirmed by parametric a
nd nonparametric procedures. Rainfall erosivity and land degradation a
re related to rainfall regime. The Algarve's rainfall erosivity increa
se (+17%) was more pronounced than annual and seasonal rainfall change
s.