What is the purpose of a bubbler in water measurement?

A bubbler in water measurement is primarily used to measure the depth of water at specific points, such as at a weir. The bubbler system works by introducing air bubbles through a submerged tube that is placed in the water. The level of water above the tube creates pressure that can be measured. This pressure correlates with the water depth, therefore allowing operators to accurately gauge how much water is present.

The application of a bubbler system is particularly effective in maintaining accurate depth measurements over time, which is critical for calculations of flow rates in various water management practices. This technique is reliable, especially in conditions where traditional measuring devices might be less effective or more prone to error due to factors like debris in the water or fluctuations in water clarity.

While options addressing airflow, calibration, and water pressure also relate to water systems, they do not describe the primary function of a bubbler in the context of measuring water depth.