Which of the following devices is used to measure water depths in storage facilities?

The device used to measure water depths in storage facilities is a transducer. A transducer typically converts one form of energy into another and in this context, it converts the hydrostatic pressure of the water column into an electrical signal that can be easily interpreted to measure the water depth. This makes it a highly effective tool for monitoring levels in storage tanks and reservoirs.

In water depth measurement, a transducer can provide continuous real-time data, making it ideal for applications where precision and timely information are critical for operational efficiency. It offers advantages such as the ability to withstand harsh environments and the capability to connect to various monitoring systems for data logging and analysis.

Other devices mentioned, such as gauges, manometers, and level indicators, have different functions or measurement principles that may not be as suitable for direct measurement of water depth in large storage facilities. While level indicators can also measure depth indirectly, they do not convert pressure to an electrical signal in the same way a transducer does, making transducers specifically valuable for these applications.