Probabilidade de ocorrência da evapotranspiração de referência na região de Dourados, MS.

Abstract

The aim of this work was to study the distribution accumulative probability ocorrence of reference evapotranspiration (ETo) in Dourados, Mato Grosso do Sul State. The ETo, estimated by Penman equation, considering climatic parameters of 16 years, was accumulated for periods of 5, 10, 15, 20 and 30 days. The maximum annual values resulted in series that was adjusted to normal, log-normal and beta distribuition. The three distributions adjusted to all accumulated periods. Throught the accumulated normal distribution it was generated values of ETo for periods of 2, 3, 4, 5, 8, 10, 12 and 17 years. These values of ETo, multiplied by the crop coefficient, could be used as parameter to design irrigation systems in Dourados region.