I'm not quite sure what your after, but, there is some irrigation systems on the DLS if you look and tick your 04 box in the search fields. Don't get too technical, it is a train sim, not a farming sim. :wave:
What I'm looking for is something seen frequently here in Colorado. It similar to a standard rolling irrigation setup, except that it's fixed at one end and revolves in a circle around that end. It produces distinctive fields that are circular.