How can one determine the operating water pressure in an irrigation system?

• A. By measuring the flow rate with a meter
• B. Using a pressure gauge when water is running through the system
• C. By observing the physical condition of pipes
• D. Calculating based on the size of the sprinkler heads

Answer: (B)

Determining the operating water pressure in an irrigation system is best accomplished by using a pressure gauge when water is running through the system. This method provides a direct and accurate measurement of the water pressure at a specific point in the system while the system is in operation.

When the system is active, the pressure gauge reflects the pressure exerted by the water flow, allowing for assessment of whether the pressure is sufficient for optimal operation. This is crucial for ensuring that irrigation is effective and that the system operates within recommended pressure ranges for the components involved.

Other methods, such as measuring flow rate with a meter, observing the physical condition of pipes, or calculating pressure based on sprinkler head size, do not provide direct pressure readings while the system is functioning. These methods can provide useful information regarding the system's performance or specifications but are not substitutes for measuring the actual operating pressure with a gauge. Accurate pressure readings are essential for diagnosing issues within the irrigation system and for optimizing water use efficiency.