What type of sensors can be used to measure the actual water surface level in a storage facility?

The correct answer is the use of solid state electronic sensors to measure the actual water surface level in a storage facility. Solid state electronic sensors can provide accurate and reliable measurements of water levels without the moving parts found in mechanical systems. This enhances their durability and reduces maintenance needs. These sensors often utilize technologies such as ultrasonic or capacitive sensing, which can accurately detect the water surface level without direct contact. This makes them ideal for applications in water distribution systems where precision and reliability are paramount.

In contrast, hydraulic sensors typically measure pressure rather than water level directly, while fluid velocity sensors are designed to measure the speed of water movement, not the height of the water surface. Mechanical float sensors, while commonly used for level measurement, rely on moving components that can be subject to wear and tear, leading to potential inaccuracies over time. Thus, solid state electronic sensors stand out for their advanced technology and suitability for accurately measuring water levels in storage facilities.