Water characteristics have the majority effect on the hydraulic performance of on-farm irrigation systems and their equipment. Therefore, the aim of this study was to evaluate the hydraulic characterization of surface drip irrigation system and its emitters under saline-water conditions. Hereby, laboratory experiment was carried out at water Relations and Field Irrigation Dept., (NRC) to evaluate hydraulic performance of five emitter types. Lab experiments were conducted to evaluate hydraulic parameters for five emitter types [Non pressure compensating 1emitter (NPC1), Non pressure compensating 2 emitter (NPC2), Non pressure compensating 3 emitter (NPC3), pressure compensating emitter (PC), and Pressure compensating and Self-flushing emitter (PCS)] under water salinity (345, 2000, 4000, 6000; 8000 ppm) and different operation pressure heads (0.8, 1.0, 1.2, 1.4, 1.6, 1.8; 2 bar). Results showed that using NPC1, NPC2 and NPC3 under water salinity 345, 2000 and 4000 ppm were better in uniformity coefficient, manufacture variation, and clogging ratio. It could be concluded that emitter types of NPC1, NPC2, and NPC3 under using water salinity 345, 2000, and 4000 ppm were the best and could be recommended to apply in the field research work. There are no significant differences between PC, PCS, NPC1, NPC2 and NPC3 in this concern so, the emitters NPC1, NPC2, and NPC3 are recommended to use in field experiment.
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