Definition of evapotranspiration parameters
Areal actual ET is the ET that actually takes place, under the condition of existing water supply, from an area so
large that the effects of any upwind boundary transitions are negligible and local variations are integrated to an areal average.
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Areal potential ET is the ET that would take place, under the condition of unlimited water supply, from an area so
large that the effects of any upwind boundary transitions are negligible and local variations are integrated to an areal average.
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Point potential ET is the ET that would take place, under the condition of unlimited water supply, from an area so
small that the local ET effects do not alter local airmass properties. It is assumed that latent and sensible heat transfers within the height of measurement are through
convection only.
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