| Summary: | The investigation determines the potential effect of rainfall on soil and vegetation in areas of the Chambas basin, Ciego de Ávila, Cuba. Seven rain gauges located in the basin were analyzed using the Modified Fournier Index. It was demonstrated that the rain gauge CA-39, 83.3% of the values are within the category very low or moderate climatic aggressiveness, 16.8% correspond to high and very high. It was evidenced that CA-673, CA-676 and CA-843 rain gauges show the highest impact rates with values of 19.5%. The rain gauges CA-886, CA-887 and CA-890 only indicated a moderate climatic aggressiveness. The extreme values of climatic aggressiveness were adjusted to the Gumbel Probability Distribution Function, yielding equations that predict the behavior of this phenomenon. In the investigation, the period of return (T) 5, 10, 15, 20, 30 and 35 years is proposed for the prediction.
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