What is a piezometer used for?

A piezometer is specifically designed to measure the elevation of the water table or the pressure of groundwater at a specific location. It provides essential data regarding the hydraulic head of groundwater, which is crucial for groundwater studies, such as assessing water table fluctuations and understanding groundwater flow dynamics. This measurement helps in managing water resources, predicting the movement of contaminants in aquifers, and designing effective water wells.

In contrast, the other options refer to different aspects of water monitoring or analysis. While measuring water purity levels and analyzing water chemistry are important for understanding water quality, those tasks are typically carried out using different instruments, such as water quality sensors or laboratory equipment. Determining well construction feasibility involves evaluating geological conditions and other factors that might influence well placement and is not the primary function of a piezometer.