EVAPOTRANSPIRATION ESTIMATION IN JANUÁRIA-MG BY CLASS “A” PAN AND HARGREAVES-SAMANI METHODS

Abstract

The objective of this study was to evaluate the performance of the Class A (TCA) and Hargreaves-Samani (HS) method, compared to the Penman-Monteith method (PM), to determine reference evapotranspiration (ETo) in Januária, MG . Climatic data from January 1, 2014 to December 31, 2016 were used, belonging to the INMET weather station database. Correlation, linear regression and Willmott concordance and performance index determinations were performed. According to the results obtained, it can be concluded that the TCA method overestimates ETo in the Januária-MG region, but performed well when adjusted to the PM method. Regarding the HS method, the results obtained show that it overestimated ETo in most of the months, but showed a high correlation coefficient and satisfactory performance, so that both methods can be used to estimate ETo in the region of Januária MG, when not have all the data necessary for determination by the PM method.