In order to study effects of pressure on water distribution model of low-pressure sprinkler, a series of hydraulic performance experiments are carried out. The effects of pressure on the water distribution model are explored by calculating sprinkler irrigation combination uniformity coefficient(Cu)and combination distribution uniformity(Du)under the combined rectangular conditions at different pressures. The results show that sprinkler intensity increases steadily with the increasing pressure until it reaches a certain high constant value. The change in sprinkler irrigation intensity is dependent on the distance from the sprinkler. Cu and Du are important indicators for evaluating the sprinkler hydraulic performance in a low-pressure range. The effects of pressure on Cu and Du are obvious. In the range of 100-200 kPa, Cu and Du increase with the increasing pressure. In the range of 200-300 kPa, Cu and Du change a little. Finally, a relationship between Cu and Du is put forward. This study provides a basis for establishing a water distribution model for multiple factors.
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