What are the two most important factors influencing water pressure at the supply side?

The two most important factors influencing water pressure at the supply side are friction and elevation. Friction refers to the resistance that water encounters as it flows through pipes and other components of the plumbing system. This friction can lead to a decrease in pressure as water travels, especially over longer distances or through narrower pipes.

Elevation plays a crucial role in water pressure because the pressure of water increases as it flows downward due to gravity. Conversely, when water needs to flow upward, such as in an elevated landscape or irrigation system, the pressure decreases. Therefore, the net water pressure experienced at a given point in the system is directly impacted by both the friction of the piping and any changes in elevation that occur along the supply route. Understanding these factors is essential for landscape contractors as they design and implement efficient irrigation systems that optimize water usage while ensuring adequate pressure throughout the system.