Piezometers measure pore-water pressure and ground water levels, providing information essential to:
- Understanding initial site conditions.
- Determining safe rates for placement of fill
- Predicting slope stability.
- Designing for lateral earth pressures.
- Evaluating the effectiveness of drainage schemes.
- Checking the performance of containment systems.
Types of Piezometers
The standpipe piezometer is the most basic type of piezometer. It consists of filter tip joined to a riser pipe that extends to the surface. Water flows through the filter tip into the riser pipe. Readings are obtained with a water level indicator.
The vibrating wire piezometer is the most commonly deployed type of piezometer. Suitable for most applications, it can be installed in a borehole, embedded in fill, or suspended in a standpipe. Readings are obtained with a portable readout or a data logger.
The pneumatic piezometer operates by gas pressure. It can be installed in a borehole, embedded in fill, or suspended in a large diameter standpipe. Readings are obtained with a pneumatic indicator.
The titanium piezometer is a 4-20mA device that is compatible with industrial data loggers. It is generally used for drawdown tests.