SPACE-TIME VARIATION OF THE CLIMATIC WATE R AVAILABILITY IN THE STATEOF GOIAS, BRAZIL

This study sought to evaluate the climatic water availability in the S tate of Goias, Brazil, from precipitation data, with probability of 75 %, and evapotranspiration potential data. The Geographical Information System was used, which besides carrying out the operations of georefe renced data on precipitation and evapotranspiration, allowed the spati alization of climatic water availability. The results obtained showed that the State is characterized by two well-defined climatic seasons: one, rainy, with an excess of precipitation, and the other, dry, with an almost complete lack of rain and marked by a water deficit. The wat er excess verified in the rainy season follows a spatial tendency whic h decreases in importance from Northwest to East and from North to Sou th. Divided into classes with 20 mm intervals, the water excess result ed in a very heterogeneous spatial distribution, while the water defic it, with a lesser range of variation, showed a more homogeneous spatia l variation.