Which of the following pressures is generally considered optimal for functioning most sprinkler systems?

The range of 40-60 psi is generally considered optimal for most sprinkler systems due to a few key factors related to both performance and efficiency. At this pressure level, sprinkler heads operate effectively, providing ample coverage and adequate droplet size for uniform distribution of water.

When the pressure falls below 40 psi, several issues can arise, including limited spray distance and poor water distribution, which may lead to dry spots in the irrigated area. Conversely, pressures above 60 psi can lead to misting and evaporation, particularly in windy conditions. Misting reduces the amount of water that actually reaches the ground, wasting water and potentially causing uneven irrigation. Moreover, excessive pressure can stress the sprinkler system components, increasing the likelihood of leaks and mechanical failures.

Thus, the 40-60 psi range strikes a balance that maximizes the efficiency of water use while minimizing system stress and ensuring effective coverage, making it the preferred operating range for most sprinkling systems.