New equation revolutionizes monthly evapotranspiration estimates in arid climates.
The researchers compared different equations to estimate evapotranspiration in the south of Iran. They found that the original Hargreaves equation worked best in humid areas with low windspeed, while a new equation including rainfall data was more accurate in arid and semi-arid regions. A new equation was also developed for specific stations in the south of Iran using temperature and rainfall data.