Estimativas de evapo(transpi)ração no Reservatório de Chapéu d’Uvas (MG)

Abstract

According to Federal Law 9,433/97, known as the “Water Law”, artificial reservoirs can have different uses, ranging from the generation of hydroelectric energy, volume control and flow downstream of the dam. Therefore, it is necessary to generate data that can be used to understand the quantity conditions of the water source. The results of the work showed an increasing trend in Potential Evapotranspiration (PET), estimated using the Thornthwaite & Mather (1955) method, with this trend being significant in the months of September, October and December, a reduction in rainfall and a tendency to increase in average monthly temperatures, the most significant trends occur in the months of September, October, November and December, months of the rainy season, which may cause problems regarding the amount of water available in the reservoir in the future, especially if the season is dry is actually prolonging. Added to this are the disorderly occupations on the banks of the Chapéu d’Uvas reservoir (PPA area) which can compromise the quantity and quality of the dammed waters. The present work seeks to advance the understanding of the microclimate in reservoirs, through the use of statistical tests, such as the MannKendall (MK) trend assessment test.