Evapotranspiration - the Most Unreliable Parameter of the Water Budget (original) (raw)

2002

Abstract

Evapotranspiration, as the transfer of water into the atmosphere from a free surface a bare soil or interception on a vegetal cover and evaporation through stomata, is extremely complicated process. It is very hard to control, monitor and define it on the regional and/or catchment scale. For catchment water budget knowledge of exact actual evapotranspiration is crucial. There are few empirical formulas, which give different results. The paper deals with the problem of assessing the possible accuracy of actual and potential evapotranspiration determination on the catchment and regional scale. Some examples are given. Definite conclusion is that the actual and potential evapotranspiration performs the most unreliable parameter of the water budget.

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