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Uso do algoritmo SAFER para estimativa da evapotranspiração em sub-bacias do Rio Novo, municipio de Avaré-SP

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The use of satellite data has recently been adopted in studies for estimating hydrologic parameters, since they had presented efficient results calculating the surface radiation balance. On account of this, combining the set of remote sensing and agrometeorological data, it is possible to estimate evapotranspiration in large areas, based on the energy balance. The model applied in this case is a great tool for monitoring the effects of water withdrawl in the region, alerting and avoiding possible conflicts among users of water resources. Thereby, the present article sought to study the behavior of evapotranspiration in different types of land covers, with a high density of center-pivot irrigation systems through the SAFER (Simple Algorithm for Evapotranspiration Recovery) Algorithm in nine sub watersheds of Rio Novo, located in Avaré County, São Paulo state. The highest rates were found in February and October reaching values of 6,29 mm dia-1 and 7,60 mm dia-1. The center pivot systems and the citrus culture was the biggest water consumers.