How can you determine static water pressure in a system?

• A. By running the irrigation system
• B. Using a pressure gauge with water running
• C. Using a pressure gauge when water is not running
• D. Checking the water temperature

Answer: (C)

To determine static water pressure in a system, using a pressure gauge when water is not running is the appropriate method. Static pressure refers to the pressure in the system when there is no flow occurring. This is typically measured at the point of entry into the system, allowing you to understand the baseline pressure available for the irrigation system or any plumbing installation.

When water is not in motion, the pressure reflects the actual force exerted by the water sitting in the pipes without the influence of flow dynamics, which could alter the readings. This measurement is crucial for system design and optimization, as it helps in sizing pumps and ensuring that delivered pressure meets the needs of the irrigation setup.

Using a pressure gauge while water is running would yield a dynamic pressure reading, which doesn't account for the baseline static conditions. Running irrigation or checking water temperature does not provide a measurement of the static pressure of water, rendering those options less relevant to understanding the system's water pressure capabilities.