In the Amazon, soil deterioration, caused by erosive processes, makes the pasture vulnerable. The goal of this study was to estimate the potential erosive of rainfall in the municipality of Rurópolis, Pará State. Rainfall information were collected by National Agency for Water and Basic Sanitation, by the National Center for Monitoring and by Alerts for Natural Disasters (CEMADEN) data base.For erosivity estimation, the annual and the monthly erosivity was estimated and the R factor of the Universal Soil Loss Equation was calculated, from 1983 to 2021, totaling 39 years. The results showed high values of annual and monthly erosivity and has been classified as high or so very high, evidencing the most critical time in the rainy season. The rainiest year in the historical series was 2021, with an annual total rain of 3,580 millimeters (mm). Then, 1985 and 2008 also presented high rainfall with values of 3,333 and 3,081 mm, respectively. On the other hand, 2015 was the least rainy year and presented a total of 1,128 mm of rain. The years with the highest erosivity values were 1985 and 2021 (19.781,8 and 18.540,1 MJ mm ha-1 h-1 ano-1). Regarding the monthly erosivity, it was found that March was the month with the highest erosivity (2.668,3 MJ mm ha-1 h-1), while August had the lowest one (414,8 MJ mm ha-1 h-1). In this way, studies about risks of soil loss through erosion and, consequently, the financial losses, in the productive sector, when soil and water conservation practices are not adopted, serve to guide public policies aimed at agriculture and to help and raise awareness social actors on the needs for soil and water conservation.

In the Amazon, soil deterioration, caused by erosive processes, makes the pasture vulnerable. The goal of this study was to estimate the potential erosive of rainfall in the municipality of Rurópolis, Pará State. Rainfall information were collected by National Agency for Water and Basic Sanitation, by the National Center for Monitoring and by Alerts for Natural Disasters (CEMADEN) data base.For erosivity estimation, the annual and the monthly erosivity was estimated and the R factor of the Universal Soil Loss Equation was calculated, from 1983 to 2021, totaling 39 years. The results showed high values of annual and monthly erosivity and has been classified as high or so very high, evidencing the most critical time in the rainy season. The rainiest year in the historical series was 2021, with an annual total rain of 3,580 millimeters (mm). Then, 1985 and 2008 also presented high rainfall with values of 3,333 and 3,081 mm, respectively. On the other hand, 2015 was the least rainy year and presented a total of 1,128 mm of rain. The years with the highest erosivity values were 1985 and 2021 (19.781,8 and 18.540,1 MJ mm ha-1 h-1 ano-1). Regarding the monthly erosivity, it was found that March was the month with the highest erosivity (2.668,3 MJ mm ha-1 h-1), while August had the lowest one (414,8 MJ mm ha-1 h-1). In this way, studies about risks of soil loss through erosion and, consequently, the financial losses, in the productive sector, when soil and water conservation practices are not adopted, serve to guide public policies aimed at agriculture and to help and raise awareness social actors on the needs for soil and water conservation.