Based on the demands of agricultural water conservation development, this book targets the research gaps in jet flows of non-circular nozzles under low and intermediate pressures. It elaborates on the motion and breakout mechanisms of sprinkler jets, addresses the uneven water distribution issue under low-pressure spraying conditions, and provides theoretical foundations for the design and optimization of low-pressure sprinkler irrigation equipment. It serves as a reference for engineering technicians engaged in water-saving irrigation, teachers and students majoring in agricultural engineering.