Evaporation and Wind Drift Losses for Two Types of Sprinklers With one and Three Nozzles in Solid Set Systems in Ahwaz Climate Conditions

A proper understanding of factors affecting evaporation and wind drift losses (Ls) in sprinkler irrigation is important for developing water management strategies. In semi-arid areas such south Iran the portion of water that may be lost due to wind velocity and evaporation would be significant. The objectives of this study include characterize Ls for two type sprinklers ADF 25º with three nozzles and Nelson F80APV with one nozzle under different conditions for solid set system and propose predictive equations by multiple regression for Ls in semi-arid areas. In solid set system often one sprinkler worked on each line and they don’t have enveloped each other at the same time this can be a reason for difference of Ls in this method than others. The experiments conducted in Shahid Chamran university of Ahwaz. Four operating pressures in range of manufacture recommended for each sprinkler had applied. The factors investigate were include operating pressure، wind velocity، environment temperature، relative humidity and vapor pressure deficit. In experiments condition Ls ranged from 1. 4 to 12. 8 percent of applied water. The result showed that، wind velocity and vapor pressure deficit were the most significant factors affecting the Ls. The operation pressures used had the least effect on Ls.