[ Corresponding author: Raimundo Mainar de Medeiros Pós-Doc Federal Rural University of Pernambuco, Brazil. Copyright © 2022 Author[s] retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution Liscense 4.0. Estimation of rain erosivity index in Caruaru-Pe Raimundo Mainar de Medeiros 1, * , Manoel Vieira de França 1 , Romildo Morant de Holanda 1 , Luciano Marcelo Fallé Saboya 2 , Moacyr Cunha Filho 1 and Wagner Rodolfo de Araújo 3 1 Federal Rural University of Pernambuco, Brazil. 2 Academic Unit of Agricultural Engineering Federal University of Campina Grande, Brazil. 3 Geography Estacio de Sa University, Brazil. International Journal of Science and Research Archive, 2022, 05(02), 177–182 Publication history: Received on 02 March 2022; revised on 09 April 2022; accepted on 11 April 2022 Article DOI: https://doi.org/10.30574/ijsra.2022.5.2.0078 Abstract The objective is to determine the erosive indexes of rainfall (R), subsidizing information to the agricultural, water and textile sectors so that they can carry out planning and projects with safety aiming at improvements in productivity. The historical rainfall values of 104 years were ceded by the Water and Climate Agency of the State of Pernambuco and by the Superintendency of Development of the Northeast. The data used correspond to the series of years from 1913 to 2016 where the monthly average of each year was calculated and with the values found, determined average values of monthly precipitation in the period of 104 years. There is a need for pre-planning of land for implantation of agricultural projects, so that land displacement does not occur, supported by a monitoring of the changes occurring in the soil, especially in hillside regions, taking into account the contours of the terrain levels, thereby avoiding The silting of rivers and reservoirs. Erosivity follows the rhythm of the rainy season where its maximum occurrence is centered in the months of May, June and July and the minimum occurrences are the months of October, November and December. Caruaru was classified with low annual erosive power. Keywords: Climatic Fluctuations; Evaporative Indices; Erosive indexes; climatic factor 1. Introduction Erosion is a process of displacement of land or rocks from a surface. It can occur by the action of phenomena of nature or by human action. As for the actions of nature, we can mention the rains as the main cause of erosion. Upon reaching the soil, in great quantity, it causes landslides, infiltrations and changes in soil consistency, causing soil displacement, the process is accentuated by the wind and the temperature change. The climatic factor in regions susceptible to desertification (arid, semi-arid and dry regions), taking into account their spatial and temporal variations, is determinant in the degradation of natural resources (water, vegetation, soils, etc.), thus imposing limitations on the management and Productivity according to the statement of [6]. Of the consequences that may occur in the attributes of the current climate, the serious ones would be the increase in the indices of aridity and the desertification areas due to the increase of the water deficit, besides extreme events that would be associated, in the regions that are already arid or semi-arid, The Brazilian semi-arid region [10]. With regard to precipitation, forecasts indicate that a reduction should occur in the tropical and subtropical region and an increase in the average of the regions of higher latitudes. In the northeastern semi-arid region, droughts during the rainy season will become even more serious, compromising the rainy season quality of the region according to [10].