Evaluation of the Hydraulic Efficiency of the Sprinkler Irrigation System by Christiansen Uniformity Coefficient

Aims: The research describes the methods of conducting field studies to evaluate the effectiveness of sprinkler irrigation systems and to design them reliably. Also, the distribution of discharge in the irrigation system across the territory and its losses are analyzed.

Study Design: Christiansen's coefficient of similarity, denoted as "CU," is used to estimate the distribution of water from sprinklers.

Place and Duration of Study: The study was conducted at the Department of “Hydraulics and Hydro Informatics”, “Irrigation and Melioration” at “Tashkent Institute of the Irrigation and Agricultural Mechanization Engineers” National Research University, between June 2021 and July 2022.

Methodology: Christiansen's coefficient of similarity "CU" is carried out by studying three combinations according to the Catch Can method: sprinkler height, sprinkler discharge, and pressure changes. In order to determine the Christiansen coefficient, it is calculated using the sum of experiments in taking into account the distribution of discharge according to the height of the sprinkler at several different pressures. Based on the method given above, the optimal height was determined in the assessment of water distribution. Based on field experiments and their analysis, a graph was created based on sprinkler height and flow distribution for discharge.

Results: The optimal height of the sprinkler was chosen from three types including 0.5 m, 0.75 m, and 1 m. Among them, 0.75 m is chosen as the optimal height of the sprinkler. As a result, the correlation coefficient is the best one according to the pressure head (10 m, 12 m, 14 m, 16 m, 18 m, 20 m) and sprinkler height (0.5 m, 0.75 m, 1 m) and water distribution (between 11 m and 16 m).

Conclusion: From the results, we can calculate the water distribution of the sprinkler system of 0.75 m height of the sprinkler under different pressure heads. It is also good for designing and doing hydraulic calculations of this system.