Which instrument is used to measure water flow?

The venture meter is a device specifically designed to measure the flow of water and various other fluids. It operates on the principle of Bernoulli's equation, utilizing a converging section where the fluid velocity increases as the cross-sectional area decreases, leading to a drop in pressure. By measuring the difference in pressure between the inlet and the narrowest point (the throat) of the meter, the flow rate can be accurately determined.

This makes the venturi meter not only a practical option for flow measurement in applications such as water supply systems and industrial processes but also a reliable one due to its straightforward design and pressure differential measurement methodology.