It is through rainwater that water sources are recharged and subsequently distributed to the population, which uses this water in different ways. Knowledge of rainfall variations is of great importance for the planning and management of water resources, such as the study of intense and dry rainfall. This study aimed to analyze the historical series of rainfall from 1988 to 2019 in the city of Francisco Beltrão - PR, northwest region of the state of Paraná. As a methodology, annual precipitation data were taken, which is measured by monthly rainfall averages, on the website Águas Paraná Paraná), and with this information, it was possible to carry out analyzes of rainfall in the interval of thirty years, which is the minimum time. necessary to observe significant changes in the climate. From the results found and the analysis of the historical series, it was observed that the years 1988 and 1990 had the lowest (108 rainy days) amount of precipitation and the highest (173 rainy days), respectively. The big difference between them is that in 1988 Brazil was under the influence of the La Niña phenomenon, which reduces the rainfall regime. In addition, it was noted that there was a considerable increase in precipitation, which raises the hypothesis of the expansion of pollution, which consequently increases the rate of evapotranspiration and thus leads to an increase in rainy days. In the studied timeframe, Francisco Beltrão expanded his industrial area, which, consequently, may have generated greater atmospheric emissions. Thus, it was possible to conclude that from 1988 to 2019 the rainfall regime increased, assuming the greatest amount of pollution. There were also years when El Niño and La Ninã acted more intensely, causing disturbances that directly affected agriculture and vegetation.
Assessment of Near-Real-Time Satellite Precipitation Products from GSMaP in Monitoring Rainfall Variations over Taiwan