Technical Evaluation of Drip Irrigation Systems (Case Study: Shahid Rajaayi Agro-Industry – Dezful)

Correct and essential design is one of the important factors in development and improvement of pressurized irrigation systems. This research was performed using Miriam-keller method in order to investigate drip irrigation system implemented in Shahid Rajaayi Agro-Industry, Dezful. To do this, five systems were selected as a drip irrigation system. These systems were different in terms of lateral pipe layout and nominal discharge of drippers. Drippers used in these systems were compensating emitters with 2.2, 4 and 8 liters/hour flow rates and had parallel and pig-tail configurations. To evaluate irrigation systems, Christiansen uniformity coefficient, emission uniformity, potential efficiency of low quarter and actual efficiency of low quarter parameters were used. Mean values of the above parameters in the evaluated systems were obtained 95.12%, 91.68%, 82.91% and 91.2%, respectively. Among systems evaluated, system D from plot 110, with pig-tail lateral layout and 8 liter/hour drippers was selected as the best system in terms of measured parameters. values of uniformity coefficient, emission uniformity, potential efficiency of low quarter and actual efficiency of low quarter for this system were 98, 95.8, 86.22 and 95.8 percent, respectively. Values of emission uniformity obtained for the evaluated five systems were in "Perfect" class. Low difference of values of Potential Efficiency of Low Quarter and Actual Efficiency of Low Quarter indicates good management of these systems and suitable design of them.