What is the primary function of a pressure tank in an irrigation system?

The primary function of a pressure tank in an irrigation system is to maintain constant pressure on the mainline. By doing so, the pressure tank ensures that water is delivered consistently and uniformly throughout the irrigation system. This is particularly important for the efficient operation of irrigation systems, as varying pressure can lead to inconsistent water distribution, which can affect plant health and overall irrigation effectiveness.

In addition to providing stable pressure, the pressure tank helps to reduce wear on pumps by limiting the frequency of on/off cycling, contributing to longer equipment life and more reliable operation. This creates a more effective irrigation environment, as all areas receive the appropriate amount of water needed for optimal growth. The other options, while they pertain to aspects of irrigation, do not accurately describe the primary role of a pressure tank in this context.