Potential evapotranspiration
"Maximum quantity of water capable of being evaporated from the soil and transpired from vegetation of a specified region in a given time interval under existing climatic conditions, expressed as depth of water." (United Nations Publications, 2013)
"Maximum quantity of water capable of being evaporated in a given climate from a continuous expanse of vegetation covering the whole ground and well supplied with water. It includes evaporation from the soil and transpiration from the vegetation from a specific region in a specific time interval, expressed as depth of water." (World Meteorological Organization, 2024)
United Nations Publications. "Glossary of Shared Water Resources (English-Arabic): Technical, Socioeconomic and Legal Terminology." (2013). DOI:https://dx.doi.org/10.18356/70b462ce-en
World Meteorological Organization. 2024. “Guide to Instruments and Methods of Observation (WMO-No. 8) |.” https://community.wmo.int/en/activity-areas/imop/wmo-no_8.