Using a Hydraulic Piezometer for Long-Term Groundwater Monitoring Projects

Consistent, long-term groundwater monitoring is critical in maintaining a safe, compliant and stable geotechnical environment.

In Western Australia’s environmental and resources industries, the hydraulic piezometer offers a reliable, low-maintenance solution for gathering this data. Deployable in many different contexts, their robust design and simplicity make them ideal for long-term deployments in the toughest conditions this state has to offer.

In this article, we explain why hydraulic piezometers are ideal for long-term groundwater monitoring, how they are different from other sensors and how Monitel uses them in borehole and tailings applications.

What Is a Hydraulic Piezometer?

A hydraulic piezometer measures pore water pressure using a fluid-filled system that connects a porous ceramic tip to a remote pressure gauge. Unlike an electronic sensor, the pressure is transferred via a fluid column back to the surface, where it can be read with a Bourdon gauge or pressure transducer. Usually, the fluid will be de-aired water.

This setup means there are no sensitive electronics located at the measurement point. That makes the sensor more resilient to harsh conditions and electromagnetic interference and sets it up for reliable, long-term deployment.

Why Hydraulic Piezometers Are Perfect for Long-Term Use

Stable Readings in Low-Permeability Soils

These models are designed for clay-rich or compact soils where water movement is slow. Traditional sensors may struggle, but the hydraulic piezometer’s continuous water column ensures the stable, lag-free pressure transmission necessary for tailings dam, embankment and borehole monitoring.

Low Maintenance and High Durability

A hydraulic piezometer leaves no electronic parts exposed underground. That means they are less prone to corrosion, signal interferance and water ingress. Boasting a robust casing, they can also withstand aggressive groundwater chemistry.

Accurate Surface-Based Data Capture

Because the measurement components are located at the surface, data can be easily accessed and integrated into your preferred logging system. That means long-term systems can be scaled according to site needs and budget constraints.

Site managers can also record data manually, should they prefer.

Where We Use Hydraulic Piezometers

Tailings Dams and Retention Structures

Tailings facilities are critical in mining operations and their maintenance requires a thorough understanding of pore water pressure. To remain compliant with WA’s regulatory frameworks, site managers must monitor slope stability, seepage and other factors. The hydraulic piezometer is a popular choice for dam monitoring, offering reliable results in low-permeability zones and suffering from minimal electrical interference.

Groundwater and Borehole Monitoring

Hydraulic piezometers provide a clear picture of subsurface water pressure in boreholes. Used over time, they can reveal seasonal fluctuations, the effectiveness of dewatering programs and the long-term impacts of surrounding infrastructure and works. Highly resistant to corrosion, they can withstand saline and contaminated conditions in deeper installations.

Key Advantages of Hydraulic Piezometers

Reliable in Difficult Soils

Some sensors may falter in challenging conditions like clay or silt, but the hydraulic piezometer remains responsive and accurate. It’s water-filled systems help avoid the inaccuracies seen in some electrical sensors in those environments.

Immune to Electrical Interference

With no electronics in-ground, hydraulic piezometers are unaffected by electromagnetic interference. That makes them dependable on sites with heavy machinery and equipment.

Long-Term Operation in Harsh Conditions

The hydraulic piezometer is manufactured entirely of corrosion-resistant materials, promoting long-term performance in chemically reactive conditions and multi-year campaigns.

Compatible with Remote Logging

At surface level, these sensors can pair with pressure transducers and be connected to data loggers. With real-time, automated reporting, site managers can stay on top of compliance documentation.

Monitel’s Hydraulic Piezometer Range

Monitel utilises a hydraulic piezometer from Soil Instruments. It’s a trusted model constructed with high-quality tubing and sensor components and is compatible with most data readout systems. With a rugged design and flexible deployment options, our team have been able to successfully integrate this piezometer into groundwater monitoring systems across WA

To learn more about our range, click here.

How Monitel Delivers Hydraulic Piezometer Projects

Monitel works closely with site managers, environmental consultants and engineers to design, install and maintain piezometer monitoring systems. Our designs are tailored to each site’s geological and and regulatory context and include:

• Customised installation plans for all site types

• Potting and sealing techniques to preserve data integrity and reduce drift

• Data logging integration with transducers and wireless systems

• Scheduled site checks and system flushing for long-term accuracy

• Reporting support to ensure your site meets DWER, WHS and internal audit requirements

Speak with Us About Long-Term Groundwater Monitoring

Whether you’re managing an emerging groundwater risk or are looking to support compliance reporting, Monitel can help. Our team construct tailored monitoring systems to address the ongoing challenges of boreholes, tailings dams and other infrastructure.

Using a hydraulic piezometer, our services combine durability and quality data with long-term value, ensuring you have the insights you need. To discuss your monitoring requirements, contact us today.