What is the main purpose of a mainline pipe?

The main purpose of a mainline pipe is to carry water from the source to the valves. This is an essential function in an irrigation system because the mainline pipe acts as the primary conduit through which water is transported to various sections of the irrigation setup. By effectively transferring water from the water source—whether it be a well, reservoir, or municipal supply—the mainline ensures that there is sufficient flow to deliver water to the valves, which then control the distribution of water to the plants.

While distributing water evenly to the plants is crucial, this task is actually performed by the lateral lines or the emitters connected to the valves rather than the mainline pipe itself. Similarly, connecting valves to the source of water is a role more relevant to the service lines rather than the mainline, given that the mainline focuses specifically on the movement of water from the source. Lastly, pressure regulation is typically handled by dedicated pressure-regulating valves and not by the mainline pipe, which primarily exists to facilitate the flow of water.