This picture shows a very common high-pressure spray irrigation system in operation. The horizontal tube carries water from a pump at the center of the system. All along the tube, which can be thousands of feet long, there are triangular frames with wheels.
Water is sprayed from sprinklers all along the tube.
Thus, a large, circular pattern of land is irrigated. This kind of irrigation system is old technology nowadays, as they are not very efficient. More efficient irrigation systems are being used more often.