Abstract
Thornthwaite's approach for estimating potential evapotranspiration has been reviewed and an analysis of the criticism of its suitability was performed. An investigation of published data and results indicates that Thornthwaite's equation is not appropriate for estimating oasis evapotranspiration, a condition of advection of dry hot air to a moist vegetated area. The analysis also showed that such a simple method is reliable if appropriate care is taken with the fetch necessary to obtain the potential rate condition. Several examples were used to check Thornthwaite's proposal and it was concluded that the method should not be avoided, as has been suggested, neither for irrigation scheduling nor for climatic classification and crop zoning.
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