potential evapotranspiration

hydrology

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July 23, 2026

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Potential evapotranspiration refers to the maximum possible rate of water loss from a surface to the atmosphere, assuming an unlimited supply of water. This concept is crucial in hydrology, the study of water on and near Earth's surface. Evapotranspiration encompasses both evaporation from soil and water surfaces and transpiration from plants. Factors influencing this rate include solar radiation, temperature, wind, and atmospheric humidity. While potential evapotranspiration represents an ideal scenario, actual evapotranspiration can be limited by the available soil moisture. Estimating these rates is vital for managing resources like irrigation and predicting stream discharge.12

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hydrologic sciences
Evapotranspiration
The concept of potential evapotranspiration—the possible rate of loss without any limits imposed by the supply of water—has been an important one in the development of hydrology. Most direct measurements of rates of potential evapotranspiration are made using standard evapotranspiration pans with an open water surface. Such measurements…
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The concept of potential evapotranspiration—the possible rate of loss without any limits imposed by the supply of water—has been an important one in the development of hydrology. Most direct measurements of rates of potential evapotranspiration are made using standard evapotranspiration pans with an open water surface. Such measurements…
Read More