Which device is commonly used to measure water flow in an irrigation system?

The flow meter is specifically designed to measure the volume of water flowing through a system over a set period of time. In irrigation, understanding the flow rate is essential for effective water management, ensuring that plants receive the right amount of water for optimal growth. Flow meters can provide real-time data, allowing operators to adjust irrigation schedules and systems based on actual usage and needs of the crops.

On the other hand, a pressure gauge measures the pressure of water in the system but does not indicate the amount of water being delivered. A thermometer measures temperature, which, while important for overall plant health, does not relate to water flow. Similarly, a vacuum gauge measures negative pressure within a system, which is not relevant when it comes to assessing water flow rates in irrigation. Thus, the flow meter stands out as the most suitable and relevant device for this purpose.