You Can Measure Ground Water Levels with a Piezometer There are many reasons to monitor groundwater levels, whether you’re looking to make sure your bore well isn’t running dry or you’re checking the water level in an irrigation ditch on your farm. One of the most accurate ways to measure water levels below the surface is with a piezometer—basically, a tube of metal connected to a sensor that monitors changes in pressure. In this article, we’ll explain how piezometers work and tell you where you can find the one that will work best for your needs Piezometer Working Principle: GWL VE300 Series Piezometer liquid level transmitter is put into the liquid. The water pressure eats the position of the transmitter acts on the diffused silicon sensor through the pilot hole. The liquid level signal can be obtained by measuring the pressure. After the sensor samples the liquid level signal, it is transported first.