To overcome the accurate calculation problems for head loss of light and small sprinkler irrigationsystem, the related issues were discussed based on the basic fluid mechanism. Arranged in a line type unit, hydraulic calculation of the system was carried out step by step based on the structure and operating characteristics. The total head loss between two sprinklers was simplified as loss along the pipe multiplying experience coefficient. The formulas of sprinkler operating pressure in the system were derived. The calculation methods for head loss of the system were proposed. An example was presented to illustrate the application of the formula, and the units typed 65ZB-40C＆12×PY120 were set up for the outdoor tests. The experience coefficient was chosen 1.1 for the theoretical calculation, and 65ZB-40C pump was ensured operating in its design point. The results show that the flux were reduced along with the pipe, the sprinkler operating pressure keep reduction and stable in the first and end sides, respectively. Error bars of experimental and theoretical results were figured out. After calculation, the biggest absoluteerror happened in the sprinkler number 3 and the relative error between them were within 0.27％-1.96％.
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