What is the minimum pressure required at the last sprinkler head in an irrigation system?

The minimum pressure required at the last sprinkler head in an irrigation system is typically set at 20 psi. This pressure ensures that all sprinkler heads function effectively, distributing water evenly and covering the intended area without creating dry spots.

At this pressure level, sufficient force is maintained to produce the correct spray pattern and trajectory, which is essential for proper irrigation. If the pressure drops below 20 psi, it may result in inadequate coverage and inefficient watering, possibly leading to plant stress or insufficient hydration.

Maintaining this minimum pressure also contributes to the balance of the entire irrigation system, ensuring that while the first heads may have ample pressure, the last head still receives enough to operate effectively. This is particularly important in systems with multiple zones or in slopes where pressure loss can occur as water travels through the piping system.