Why All WA Sites Should Use A Vibrating Wire Piezometer

Western Australia’s natural environment presents a unique and complex set of monitoring challenges. Whether it be high temperatures in the Pilbara or corrosive groundwater around coastal sites, sensors endure harsh conditions to gather accurate long-term data. This is where the vibrating wire piezometer (VWP) stands out.

Used to monitor pore water pressure in soil and rock, VWPs are a staple in resources, civil construction and environmental projects across WA. Their durability, reliability and resilience to climate extremes make them one of the most trusted sensor types for long-term ground behaviour monitoring.

In this article, we explain why vibrating wire piezometers are so well-suited to WA’s conditions and how our team integrate them into effective, regulation-compliant monitoring systems.

What Is a Vibrating Wire Piezometer?

A vibrating wire piezometer measures pore water pressure using a small, tensioned wire housed in a sealed sensor body. As groundwater pressure changes, the sensor’s diaphragm deflects, altering the tension of the wire. The tension change shifts the wire’s natural frequency, which is then recorded and converted into a pressure reading.

VWPs are most commonly installed in boreholes, tailings dams, earth embankments and foundation zones. Their stability and noise resistance make them ideal for long-term and remote monitoring applications.

Why Vibrating Wire Piezometers Work Well in WA

1. Highly Durable in Extreme Heat

In WA’s northern regions, monitoring equipment must be robust. The Pilbara and Kimberly regularly experience summer temperatures exceeding 45°C and a good vibrating wire piezometer is built to handle those conditions. For even harsher environments, Monitel offers high-temperature VWPs that can reliably perform in temperatures up to 250°C. These are constructed with reinforced materials suited to buried infrastructure and deep tailings dams.

2. Stable and Noise-Resistant in Remote Areas

Many Western Australian sites are located far from power and network infrastructure. VWPs produce a frequency-based signal that is resistant to signal degradation over long cable runs and unaffected by electrical interference. In simpler terms, they are perfect for remote monitoring.

In addition, they are also compatible with automated loggers and telemetry systems, reducing your need for frequent site visits.

3. Minimal Drift for Long-Term Projects

From civil infrastructure builds to tailings storage facilities, any long term monitoring program requires reliable data. VWPs exhibit minimal sensor drift, meaning their readings remain reliable for extended periods of time without the need for recalibration. This can be vital in satisfying long-term compliance obligations under WA’s mining and environmental frameworks.

4. Flexible Installation Options

A vibrating wire piezometer can be installed in a wide range of geological settings, from hard rock to soft tailings. At Monitel, we’ve deployed them:

  • In boreholes for groundwater pressure monitoring
  • Embedded in tailings embankments for seepage and uplift detection
  • Beneath settlement zones at major construction sites

Because they can be grouted in place or installed in sand-packed zones, VWPs are compatible with various borehole designs and casing types.

Why Monitel Recommends VWPs

At Monitel, we stand firm in our technology-agnostic approach. We never base a decision on brand allegiance or supplier preference, instead choosing a sensor to suit the needs of your project.

Vibrating wire piezometers often form the backbone of our monitoring systems. Their resilience in the field, capacity for automation and proven performance in WA conditions make them a reliable choice for many clients. We stock a diverse range of VWPs, including:

  • W9 – for general-purpose pore pressure monitoring in boreholes
  • High-Temperature VWPs – for tailings dams and buried infrastructure
  • Compact VWPs – ideal for small-diameter boreholes or constrained installations

Click here to view the full range and learn more about each model.

Regulatory Relevance in WA

Vibrating wire piezometers play an important role in demonstrating compliance with multiple Western Australian regulations:

  • Work Health and Safety (Mines) Regulations 2022
  • Mines Safety and Inspection Regulations 1995
  • DWER License and Environmental Guidelines

Monitel’s VWPs support early detection of rising pore pressures, enabling prompt interventions and reducing the risk of structural failure or regulation breach.

Need Help Selecting the Right VWP? Contact Monitel Today

Whether you’re monitoring a single borehole or looking to implement a large-scale system, our team are here to assist. We’ll help you choose the right vibrating wire piezometer, complete the installation process and ensure your project meets WA’s regulatory requirements.

For more information, you can contact our team on (08) 6219 8284 or at admin@monitel.com.au.

Reliable, Accurate & Manageable Applications for a Vibrating Wire Piezometer

The Vibrating Wire Piezometer (VWP) is a trusted tool for measuring pore water pressure in geotechnical environments. From boreholes and tailings dams to embankments, tunnels and settlement zones, these sensors are can detect early warning signs of instability and protect regulatory obligations.

At Monitel, we specialise in selecting and installing VWPs that suit the demands of your site and project scope. In this article, we’ll explore where VWPs can be used and why they’re one of the most reliable sensor types for long-term, real-world monitoring.

What Is a Vibrating Wire Piezometer?

A vibrating wire piezometer uses a tensioned wire to measure changes in pore water pressure. As groundwater pressure acts on the sensor’s diaphragm, it changes the wire’s vibration frequency. That signal is converted into a pressure reading that can be logged on-site or transmitted remotely.

The vibrating wire piezometer is favoured for it’s ease of installation, accuracy and long-term stability. Furthermore, it is resistance to electrical interference and other cable noise makes it ideal for use in Western Australia’s remote regions where manual access is often limited.

We stock a wide range of VWPs, including:

  • Standard vibrating wire piezometers
  • High-temperature VWPs
  • Compact VWPs for constrained boreholes

You can see our full range of VWPs here.

1. Boreholes

VWPs are frequently installed in boreholes to measure groundwater and pore pressure at various depths. Our installations are tailored to borehole design, with proper backfill and sealing techniques used to isolate the measurement zone.

Their data can be used to support:

  • Dewatering programs
  • Foundation stability assessments
  • Environmental baseline studies
  • Long-term construction impact analysis

At Monitel, our team will often pair a VWP with other borehole instruments like standpipes and inclinometers. This allows for a more detailed profile of subsurface conditions.

2. Tailings Dams

Pore pressure is a critical to a tailings dam’s stability. By embedding a VWP in embankments or placing one at depth, site managers can detect:

  • Uplift pressure
  • Seepage
  • Pore pressure increase during rainfall or deposition events
  • Potential liquefaction risks

WA regulations such as the Work Health and Safety (Mines) Regulations 2022 and Mines Safety and Inspection Regulations 1995 require dam walls and surrounding zones to be stable and properly monitored. VWPs are a commonly used tool in these frameworks and have proven vital in ensuring ongoing viability.

3. Settlement and Pre-Load Zones

Construction sites with soft soils often require preloading to consolidate ground before building. During this process a vibrating wire piezometer can be installed beneath the pre-load to track how pore pressure dissipates over time. Pore pressure is a useful indicator in these circumstances, giving managers a strong sense of when it’s safe to proceed with foundation work.

Monitel successful monitored a pre-load zone at the Alkimos Desalination Plant, using a vibrating wire piezometer to track pore pressure beneath a proposed tank. The data assisted engineers in confirming soil stability, preventing premature construction and potential ground moment.

4. Tunnels and Underground Infrastructure

In underground projects, VWPs assist with:

  • Monitoring pore pressure changes near tunnel linings
  • Detecting ingress risks
  • Supporting dewatering programs during excavation

VWP data can help engineers understand water movement and identify pressure zones that threaten tunnel stability. In urban tunnelling projects, this monitoring also supports risk management for adjacent structures.

5. Landfill, Dams and Water Infrastructure

Beyond resources, environmental projects and civil construction, vibrating wire piezometers are used in:

  • Landfills, to track leachate movement
  • Water supply dams, to monitor seepage and pressure differentials
  • Desalination plants, for settlement and ground saturation assessments

Monitel’s systems can be tailored to suit different methods of data telemetry, allowing us to support different kinds of projects with various reporting obligations and site accessibility.

Contact Monitel & Learn More About How You Can Use a Vibrating Wire Piezometer

If you’re planning a project that involves groundwater, soft soils or slope stability concerns, constructing a robust and reliable monitoring system should be a key priority. Robust and accurate, it’s likely a VWP will be a part of that system.

At Monitel, we pride ourselves on being product-agnostic. From design through to decommission, you can trust that the VWP on your site is suited to your budget and needs.

If you would like to discuss vibrating wire piezometer applications, installation or pricing, you can speak with a member of our team at admin@monitel.com.au or on (08) 6219 8284.

Why Your Site Needs a High-Temperature Vibrating Wire Piezometer

A piezometer is a key part of any geotechnical monitoring plan. However, it is important to select a sensor that can perform accurately and reliably in your site’s environment.

In Western Australia’s more extreme industrial and resources settings, high-temperature conditions can make standard sensors unreliable or prone to drift. That’s where the high-temperature vibrating wire piezometer (VWP) comes in. Purpose-built to withstand elevated temperatures, these sensors offer accurate pore pressure data even when exposed to heat from buried infrastructure, geothermal gradients or tailings storage facilities.

In this article, we explain when a high-temperature VWP is necessary and how Monitel incorporates them into our structural monitoring systems.

What Is a High-Temperature Vibrating Wire Piezometer?

A high-temperature VWP functions the same way as a standard vibrating wire piezometer, using a tensioned wire and diaphragm to measure changes in pore water pressure. Where they differ is in their construction.

High-temperature VWPs are manufactured with heat-resistant materials and reinforced internal components, allowing them to perform reliably and accurately in temperatures up to 250°C. These sensors also maintain signal integrity under thermal stress, making them suitable for long-term, automated monitoring in locations where conditions would compromise other sensor types.

When Are High-Temperature VWPs Needed?

In projects where ground or fluid temperatures exceed the standard operating ranges of standard piezometers, a high-temperature sensor is essential. Common applications include:

1. Tailings Dam Facilities

Tailings dams can experience elevated temperatures due to chemical reactions, solar exposure or underlying geological conditions. Elevated pore pressure and heat can combine to reduce stability, increasing the risk of dam wall deformation or failure. High-temp VWPs offer accurate pore pressure data in these critical zones, helping operators meet the requirements of the Mines Safety and Inspection Regulations 1995 and WHS (Mines) Regulations 2022.

2. Buried Industrial Infrastructure

In WA’s energy and water sectors, buried pipelines and tanks may generate or retain heat, particularly in remote, arid regions. Monitoring the soil conditions surrounding these structures often requires sensors that can withstand the high ambient and subsurface temperatures common in WA’s regions.

3. Geothermal Projects and Deep Boreholes

Projects tapping into geothermal heat or those with deep borehole infrastructure may encounter naturally high temperatures. Opting for a high-temperature VWP will ensure that pore pressure measurements remain reliable, even when installed hundreds of metres below ground.

4. Preload Zones with Accelerated Settlement

When preload or surcharge strategies are used in hot conditions (for example, on shadeless industrial sites), standard piezometers may degrade over time. High-temp VWPs offer a resilience against these elements, assisting projects affected by vertical loading and thermal influence.

Benefits of High-Temperature VWPs

  • Thermal resilience: Maintains accuracy in elevated temperature zones.
  • Long-term stability: Suitable for continuous monitoring across months or years.
  • Signal integrity: Resistant to noise or degradation caused by heat and moisture.
  • Remote compatibility: Easily integrated with wireless loggers and telemetry systems.

Ambient and subsurface heat is a primary concern for many Western Australian projects. Robust and capable of high performance in extreme conditions, this sensor class can be the difference between early detection and unexpected failure.

How Monitel Implements High-Temp VWPs

At Monitel, our planning and investigation process includes an assessment of site-specific thermal risks. Where needed, we will complete the installation of a high temperature vibrating wire piezometer as part of a broader geotechnical monitoring plan.

Our team handles design, installation, telemetry integration and ongoing data interpretation to ensure your sensor selection aligns with site conditions and regulatory obligations.

High-temperature VWPs often form part of our:

  • Tailings dam monitoring systems
  • Borehole instrumentation programs
  • Settlement tracking and pre-load assessment tools

Monitel primarily deploys the VWPHT-3600, which boasts a pressure range up to 34.5 MPa and 3K and 10K thermistor options.

However, we pride ourselves on being brand and product agnostic, meaning we will always opt for the sensor best suited to your project and budget. We will never prioritise any brand allegiance.

Speak With Monitel About Sensor Selection

If you are unsure whether your project needs a high-temperature or standard vibrating wire piezometer, we’re here to help. Monitel works closely with geotechnical engineers and project managers to design and implement compliant, efficient monitoring solutions across WA.

For more information about vibrating wire piezometer installation, pricing and data, you can contact us at admin@monitel.com.au or call (08) 6219 8284 to speak with our team.

Troubleshooting Your Vibrating Wire Piezometer: Common Errors and How to Fix Them

The vibrating wire piezometer (VWP) is known for its durability, accuracy and reliability in long-term geotechnical monitoring. But even the most robust of these sensors can run into problems if not installed, configured and maintained correctly.

Understanding the most common VWP errors (and how to fix them) is essential in keeping your monitoring system accurate and compliant with Western Australian regulations.

In this post, we cover typical issues encountered with VWPs across boreholes, tailings dams and settlement monitoring programs. You’ll also learn how Monitel helps clients prevent and resolve these errors in the field.

What Is a Vibrating Wire Piezometer?

A vibrating wire piezometer measures pore water pressure by detecting changes in the tension of its main wire. As pressure on the diaphragm changes, the frequency of the vibrating wire shifts. The frequency is then converted into readable data either manually or via automated loggers.

VWPs are known for their resistance to electrical interference and moisture, making them ideal for the challenging conditions so common across WA. However, their performance still depends on proper installation, configuration and calibration.

Common VWP Issues and How to Fix Them

1. No Signal or Flatline Readings

What’s the issue?: The sensor is not outputting any data or the signal is stuck at a constant value.

Possible Causes:

  • Broken or damaged cabling
  • Incorrect wiring to the data logger
  • Moisture ingress into the cable or junction box
  • A failed sensor (although this is unlikely)

How to Fix It:

  • Inspect all cabling and connectors for damage or water ingress.
  • Test the continuity of the cable using a multimeter.
  • Ensure that polarity and signal wiring are correctly configured at the logger.
  • If everything checks out but the sensor remains unresponsive, replacement may be necessary.

2. Unstable or Noisy Readings

What’s the issue?: The data shows irregular spikes, oscillations or inconsistent values.

Possible Causes:

  • Electrical noise interference (possibly from nearby equipment)
  • Poor grounding of the logging system
  • Loose connections or compromised shielding
  • Temperature fluctuations affecting unshielded installations

How to Fix It:

  • Relocate the sensor cable, creating distance from power sources or high-voltage equipment.
  • Check that the logger and all sensor cabling are properly grounded.
  • Use shielded cables and ensure connections are tight.
  • Consider using temperature compensation in the logger settings.

3. Drift Over Time

What’s the issue?: The sensor data gradually changes in one direction without any real change in pore pressure.

Possible Causes:

  • Sensor diaphragm degradation
  • Excessive temperature exposure (especially above rated range)
  • Air entrapment around the diaphragm
  • Long-term material fatigue

How to Fix It:

  • Use high-temperature VWPs such as the VWPHT-3600 for thermally active sites.
  • During installation, ensure full saturation of the filter tip to avoid air pockets.
  • If drift persists, recalibration or sensor replacement may be necessary.

4. Zero Readings in a Wet Environment

What’s the issue?: The piezometer is reading no pressure despite being submerged.

Possible Causes:

  • Incorrect elevation reference used during installation
  • The filter tip may not be fully saturated
  • Sensor was installed above the water table or pressure zone
  • Faulty logger calibration

How to Fix It:

  • Double-check piezometer depth against borehole logs or groundwater level data.
  • Ensure proper installation of sand and bentonite seals around the filter tip.
  • Validate and adjust logger calibration or reference values.

Preventing Errors During Vibrating Wire Piezometer Installation

With proper planning and execution, projects can avoid many of the problems listed above. At Monitel, we follow a strict vibrating wire piezometer installation process that ensures:

  • Sensors are selected based on site conditions (e.g. high-temp VWPs for heated environments)
  • Cabling and junction boxes are sealed and weatherproof
  • Boreholes are prepared with the correct sand filter and bentonite seal configuration
  • All sensors are tested and zeroed prior to installation
  • Data loggers are configured with project-specific tolerances and alert thresholds

We have designed this approach to keep all monitoring systems compliant with the the Work Health and Safety (Mines) Regulations 2022 and Mines Safety and Inspection Regulations 1995.

Effective monitoring and proven compliance are our priority. That is why we champion a product and technology agnostic approach, always choosing the best sensor for your site, not our bottom line.

Design and Implement a Monitoring System with the Monitel Team

Whether you’re installing VWPs for the first time or troubleshooting an existing system, the Monitel offers practical support. That includes:

  • Diagnostic testing for sensor and logger faults
  • Field recalibration and replacement services
  • Automated alert configuration and data reporting
  • System audits to ensure compliance with local requirements

If you would like to speak with our team about unusual data, absent data or another issue, please contact Monitel at admin@monitel.com.au or call (08) 6219 8284. Our team can help identify the cause and get your monitoring system back on track.

How to Interpret Vibrating Wire Piezometer Data and Understand Pore Pressure Trends

To ensure stability, structural integrity and compliance on site, project managers must have a firm understanding of pore pressure behaviours. For complex sites like tailings dams and deep boreholes, a vibrating wire piezometer (VWP) can prove an important tool.

Known for their high accuracy and reliability in long-term monitoring, VWPs provide the data that allows engineers to make informed, proactive decisions. But what exactly should you be watching for when analysing VWP data?

This article outlines the key pore pressure trends to monitor, what they mean for your project, and how Monitel can support you in interpreting and acting on these changes.

If you would like to learn more about vibrating wire piezometer selection, installation and pricing, please contact our team.

What Is Pore Pressure and Why Does It Matter?

Pore pressure is the pressure exerted by water within the pores of soil or rock. It has a direct influence on ground stability, particularly under load or during changes in moisture, temperature or excavation. If allowed to rise beyond expected levels, pore pressure can slop failures, foundation instability or, in the case of tailings dams, collapse.

Continuous monitoring with a VWP is the surest way to identify warning signs early and implement proactive responses before conditions become unsafe and non-compliant.

What is a Vibrating Wire Piezometer and How Does it Capture Pore Pressure Trends?

Capable of high-performance in harsh environments, VWPs are the preferred sensor for much of WA’s resources and infrastructure industries.

They convert water pressure changes into frequency signals, which are logged either manually or via automated data acquisition systems. This makes them especially useful for establishing baselines and monitoring fluctuations over time. VWPs can be installed in boreholes, embankments and dam walls, amongst other applications.

The 5 Pore Pressure Trends You Should Monitor

1. Seasonal Variation

In surface soils and shallow boreholes, you’ll often see pore pressure fluctuate with seasonal rainfall and evaporation cycles. Sites must ensure that any changes in data match climate variations. For example, higher readings after prolonged wet periods are normal, but sudden increases outside expected rainfall windows may indicate water ingress or drainage failure.

What to watch for:

  • Gradual pressure rise during rainy seasons
  • Return to baseline during dry conditions
  • Anomalous surges outside seasonal norms

2. Construction-Induced Changes

On active sites like road, tunnel or mine developments, pore pressure may change in response to ongoing works. This could be the cause excavation, dewatering or loading. A spike may reflect stress redistribution or soil saturation and more rapid changes should be afforded immediate attention.

What to watch for:

  • Sudden jumps in pressure following excavation or fill
  • Unexpected recovery of pressure after dewatering
  • Persistent pressure elevation without external cause

3. Consolidation Trends

In soft clays, pore pressure will initially rise under new load before dissipating as water escapes and soil consolidates over time. A well-installed vibrating wire piezometer can help track this consolidation curve, indicating settlement rates and potential for future movement.

What to watch for:

  • Initial high readings after load placement
  • Steady decline in pressure as water drains
  • Deviations from expected settlement curves

4. Tailings Dam Pore Pressure Build-Up

Excess pore pressure within a tailings structure could indicate that material is not draining properly or that there’s seepage from upstream sources. When installed at various depths VWPs will pinpoint the layer or zone of concern.

What to watch for:

  • Pressure increase after new tailings deposition
  • Inconsistent readings between piezometer layers
  • Lack of expected dissipation over time

5. Groundwater Recharge and Drawdown

When monitoring wells, VWPs can track groundwater responses to nearby abstraction, rainfall events or aquifer recharge. These trends help model aquifer behaviour and support compliance with the Department of Water and Environmental Regulation (DWER).

What to watch for:

  • Slow recharge rates indicating reduced permeability
  • Rapid drawdown suggesting over-abstraction
  • Long-term baseline shifts across seasons or years

Contact Monitel for Reliable, Accurate & Informed Vibrating Wire Piezometer Data

Pore pressure is a dynamic, high-stakes factor on geotechnical sites. While VWPs provide the raw data, it takes contextual understanding to interpret it. This is where Monitel supports clients: by going beyond installation to create actionable monitoring frameworks.

Our team helps interpret vibrating wire piezometer data by:

  • Establishing site-specific baseline pressure levels
  • Creating trend thresholds for alerts
  • Automating data transmission and flagging anomalies
  • Linking pressure changes with onsite activities or environmental events

This ensures that pore pressure trends are not just recorded, but used to improve site safety respond early to prevent instability and delay.

At Monitel, our team have created tailored monitoring systems on sites across Western Australia. To learn more about how we can help you monitor pore pressure safely and effectively, contact us at admin@monitel.com.au or call (08) 6219 8284.

Vibrating Wire vs Standpipe Piezometer: Which Is Best for Your Project?

To ensure reliable data and long-term monitoring success, you must choose the right piezometer.

Two of the most commonly used sensors in this class are the Vibrating Wire Piezometer (VWP) and the Standpipe Piezometer. Each has distinct advantages and limitations, and choosing the right one depends on your site conditions, regulatory obligations, data needs and project duration.

In this article, we outline how the two compare and offer guidance on when to use each. For more information about vibrating wire piezometer installation, monitoring and costing, get in touch with our team.

What Is a Standpipe Piezometer?

A standpipe piezometer is a simple groundwater monitoring tool typically installed in a borehole. It is constructed with a porous filter tip connected to a riser pipe, which extends to the surface. The water level inside the pipe is a direct reflection of the pore water pressure at the depth of the tip.

These systems are most commonly used for manual monitoring, where water levels can be comfortably measured with a tape, float or pressure transducer.

Key features:

  • Cost-effective and easy to install
  • No power supply required
  • Suitable for short- to medium-term projects
  • Provides water level readings, not continuous pressure data

What Is a Vibrating Wire Piezometer?

A vibrating wire piezometer is an electronic sensor that measures pore pressure using a diaphragm and vibrating wire mechanism. Changes in pore pressure alter the tension in the wire, which is converted to a readable frequency signal and recorded by a logger.

VWPs are widely used in infrastructure, resources and tailings dam projects in WA. They are a particularly popular choice where automated, real-time monitoring is a requirement.

Key features:

  • High accuracy and stability
  • Suitable for long-term monitoring
  • Compatible with remote and automated systems
  • Performs well in harsh or saturated conditions

Key Comparisons

Feature Standpipe Piezometer Vibrating Wire Piezometer
Cost Low initial cost Higher upfront cost
Data Collection Manual, periodic Automated, continuous
Installation Simple borehole install Requires cabling and loggers
Accuracy Limited to water level High-resolution pressure readings
Suitable Environments Low-risk or temporary projects Complex, regulated, long-term sites
Use in Tailings Dams Rarely suitable Common and often required
Regulatory Suitability Basic compliance Supports detailed reporting for WHS & DWER

When to Use a Standpipe Piezometer

Standpipe piezometers are suitable for:

  • Environmental baseline studies with occasional data requirements
  • Short-duration construction sites that don’t need automated alerts
  • Sites where funding or access constraints prevent a more complex or automated system
  • Manual verification alongside automated systems

These applications reveal the standpipe piezometer’s 3 key advantages: simplicity, ease of installation and a minimal need for infrastructure.

On the other hand, they offer limited resolution and are not suitable for projects requiring real-time pressure updates.

When to Use a Vibrating Wire Piezometer

VWPs are preferred for:

  • Tailings dam monitoring, where accurate, continuous pressure tracking is often mandated by WA regulations
  • Borehole installations, particularly those supporting settlement studies, embankment behaviour or water table monitoring
  • Infrastructure and mining compliance, where the Mines Safety and Inspection Regulations 1995 and WHS (Mines) Regulations 2022 require robust data
  • Automated early warning systems, particularly in areas of known instability

Standard VWPs boast a robust build, but there are also high-temperature models available. These are a suitable choice for monitoring in remote WA, where harsh conditions are often a barrier for accurate and reliable data. Furthermore, most VWPs can be set up with automated telemetry, reduing the need for site visits.

Which Sensor Is Right for You?

If you are looking to construct a monitoring system, ask the following when choosing between VWPs and standpipes:

  • What are the regulatory requirements for my project?
  • Do I need real-time or high-frequency data?
  • How long will the monitoring period last?
  • Is remote or automated access important?
  • What is the risk level if pore pressure is not closely tracked?

For low-risk or temporary sites, standpipes may be sufficient. But for regulated, high-stakes or long-term projects, VWPs are the safer, more informative choice.

Contact Monitel for Structural and Geotechnical Monitoring Advice

Choosing the right piezometer is about ensuring your data is reliable, actionable and suited to your project’s requirements. In Western Australia, where regulatory frameworks and geotechnical conditions are demanding, Vibrating Wire Piezometers are increasingly becoming the standard.

At Monitel, we offer vibrating wire, standpipe and other varieties of piezometer. Guided by our product agnostic approach, our team will advise you on the system best suited to your site and budget. Following design and selection, you can rest easy knowing that we will continue to support you through installation, data collection and compliance reporting.

To speak with us about your monitoring needs, contact Monitel at admin@monitel.com.au or call (08) 6219 8284.

What Type of Piezometer Should You Install in a Borehole?

The right piezometer will collect accurate and relevant data from a borehole, whilst a poorly suited sensor will leave you with holes in your findings. To make the most of your monitoring system, it is critical to select the right piezometer.

There various types available, each with their own features, installation methods and monitoring capabilities. When making a decision, you should consider these characteristics and the nature of your site.

This guide outlines the main types of piezometers we use and how to select the right one for your borehole monitoring needs. If you are unsure about what piezometer is suited to your site, please contact Monitel at admin@monitel.com.au or call (08) 6219 8284 for further assistance.

What Is a Piezometer?

A piezometer is an instrument used to measure the force of water held within the voids of soil or rock, known as pore water pressure. When installed in a borehole, a piezometer records water pressure at a specific depth, providing insight into groundwater behaviour, drainage and stability.

Piezometers can be used in a wide range of applications, including:

  • Monitoring the effectiveness of dewatering
  • Tracking groundwater changes in environmental assessments
  • Supporting slope stability and dam safety assessments
  • Meeting compliance obligations under WA regulations

At Monitel, we stock both manual and automated options, catering to different monitoring frequencies and data collection abilities.

Factors That Influence Your Choice

Several factors considerations should guide the selection of a piezometer for borehole use:

  • Monitoring Duration: Is this a short-term site investigation or a long-term compliance program?
  • Data Frequency: Will data be collected manually every few weeks or logged continuously in real time?
  • Installation Environment: Is the ground soft, firm, saturated or contaminated?
  • Depth and Accuracy Requirements: How deep is the borehole and how precise must the readings be?
  • Regulatory Requirements: Are there DWER, DMIRS or project-specific standards that must be met?

Having carefully considered these criteria and following discussion with an environmental consultant, you will be able to choose from one of the piezometers below.

Piezometers Commonly Installed in Boreholes

Vibrating Wire Piezometers (VWPs)

VWPs are ideal for long-term monitoring where accuracy and durability are essential. Installed at the target depth and connected to a data logger, they deliver stable readings over long cable runs and harsh site conditions.

Best for: Automated borehole systems, tailings dams, deep foundations

Examples of VWPs we stock include the W16 Kompakt and the W9.

Standpipe Piezometers

A simple and cost-effective option, standpipes consist of a slotted pipe installed in a borehole, typically at depths between 5 and 30 metres. When using these sensors, water levels are measured manually with a dip meter.

Best for: Short- to medium-term monitoring where manual readings are acceptable

Our most popular standpipe piezometer is the W1.

Pressure Transducer Piezometers

These sensors provide a continuous electrical signal, making them suitable for real-time monitoring and remote integration. They’re often used in boreholes that require consistent reporting, such as those in environmental compliance projects.

Best for: Continuous groundwater level tracking and integration with telemetry systems

The SGP-3400 Series is the most commonly used pressure transducer piezometer in our range.

Drive-In Piezometers

Designed for soft ground, these are installed without a pre-drilled borehole, using rods or CPT rigs. While less common in traditional borehole setups, they’re useful in tailings and unconsolidated material.

Best for: Soft sites where drilling is not feasible

The Monitel team often use the WP-3400 & SGP-3500 Series drive-in piezometers . Some of our other piezometers have a drive-in capacity available on request.

Strain Gauge Piezometers

Strain gauge piezometers use electrical strain gauges to detect pressure changes and respond quickly to dynamic site conditions.

Best for: Boreholes where fast response is required and integration with digital systems is planned

Monitel stocks the SGP-3400 strain gauge piezometer.

High-Temperature VW Piezometers

Where elevated ground temperatures may affect standard sensors, high-temperature VWPs provide reliable performance and long-term data. This could be in buried infrastructure or heated zones.

Best for: Boreholes in thermally active or industrial environments

The VWPHT-3600 is a high-temperature VWP we have deployed across Western Australia.

Choosing the Right Setup

For some projects, a single piezometer at a specific depth is more than enough.

Elsewhere, it may be better to install multiple sensors within the same borehole to get a more accurate understanding of vertical pressure gradients.

Our team of environmental consultants tailors each system to the particular project or site, taking into account:

  • Borehole construction and casing
  • Site hydrology and stratigraphy
  • Project objectives and regulatory obligations

Enquire Today for Assistance with Borewell Piezometer Solutions

Selecting the right type of piezometer is key to collecting meaningful, actionable data from a borehole monitoring. Each sensor type offers distinct advantages and you may miss out on important insights should you make the wrong decision.

Monitel works closely with clients across WA to deliver tailored piezometer monitoring solutions that ensure accuracy, compliance and long-term value.

To discuss your borehole monitoring requirements or a possible monitoring solution, contact Monitel at admin@monitel.com.au or call (08) 6219 8284.

Why a Borehole Needs a Piezometer: Understanding Subsurface Water Behaviour

Boreholes act as a window into what’s happening beneath the surface. But in order too get the best insight, it is important to use the right instrumentation.

A piezometer is one of the tools best suited to extracting meaningful and actionable data form a borehole. They measure pore water pressure, helping engineers and asset managers understand how water is moving through soil and rock layers.

At Monitel, we have integrated piezometers into many borehole monitoring systems across Western Australia. Our solutions help you make safe, informed project decisions and are designed in line with regulatory requirements.

This article explains why piezometers are so useful in boreholes and how they explain subsurface water behaviour. If you are unsure about what is required on your site, you can speak with a member of our team at admin@monitel.com.au or call (08) 6219 8284.

What Is a Piezometer?

A piezometer is a device used for measuring ground water levels and pressures. These factors influence how stable or mobile the surrounding ground is, making piezometers a key instrument in geotechnical and environmental monitoring.

In borehole applications, piezometers are installed at specific depths to capture pressure conditions within that area. By installing one, stakeholders can monitor how groundwater behaves over time and whether it is causing instability, seepage or drainage issues.

What Is Subsurface Water Behaviour?

Subsurface water refers to groundwater and the pressure it exerts within soil or rock pores. Known as pore water pressure, this affects the stability, strength and drainage characteristics of the surrounding ground.

Variations in pore water pressure can be caused by rainfall, construction activity or dewatering and often lead to slope instability, foundation settlement or unexpected seepage.

Continual monitoring of subsurface water behaviour will help stakeholders:

  • Detect risks early
  • Develop informed design and construction plans
  • Comply with environmental and safety regulations

Why Should Piezometers be Installed in Boreholes?

Boreholes are commonly drilled for site investigations and long-term monitoring. Installing a piezometer in a borehole transforms it from a passive observation point into an ‘active monitoring system’.

An ‘active’ borehole will provide the following benefits:

Accurate Pressure Measurements at Depth

In boreholes, piezometers are installed at targeted depths to monitor specific geological layers. This allows users to track groundwater levels and pressure changes where they are most relevant to a structure. That might be below a foundation, within a dam wall or through a clay/sand interface.

Risk Detection for Stability and Safety

Works that cause ground movement can create a risk of pore pressure volatility. In applications like slope stability assessments and tailings dam monitoring, piezometer data can offer early warnings of changing pressures and prevent structural damage.

Environmental and Regulatory Compliance

Piezometers support compliance with WA legislation, including:

  • WHS (Mines) Regulations 2022
  • Mines Safety and Inspection Regulations 1995
  • DWER licensing conditions

Monitoring groundwater conditions in and around boreholes is often a requirement for environmental impact assessments, water management plans and mining proposals.

Long-Term Trend Analysis

Piezometers installed for extended periods can track seasonal groundwater fluctuations, effects of nearby construction and drainage performance. This information supports future development decisions.

Choosing the Right Piezometer for a Borehole

Different piezometers suit different borehole setups. Below we have listed some of the sensors in our piezometer range and their ideal applications:

  • Vibrating Wire Piezometers (VWPs): Ideal for long-term automated monitoring, with high accuracy and signal stability.
  • Standpipe Piezometers: Simple and cost-effective for manual level readings, typically installed at depths of 5–30 m.
  • Pressure Transducers: Provide continuous electrical output for integration with remote monitoring systems.
  • Multi-Point Piezometers: Allow for pressure profiling at multiple depths within the same borehole.

Our team will help you select and install the most suitable sensor based on project requirements, site conditions and budget constraints. For more information, you can read our article ‘Choosing the Right Piezometer Depth’.

Enquire Today for Borewell Piezometer Advice

Piezometers are perfect for extracting accurate and meaningful data from boreholes. They provide the information needed to assess groundwater behaviour, manage geotechnical risk and meet compliance obligations.

if you would like to speak to our team about borehole monitoring or a piezometer system, you can contact admin@monitel.com.au or call (08) 6219 8284

Choosing the Right Depth for Piezometer Placement in a Borehole

Piezometers are essential tools in borehole monitoring, providing measurements of groundwater pressure and supporting safe, informed decision-making across Western Australian industries.

However, without proper placement and depth selection, their effectiveness can be limited. At Monitel, we work closely with engineers, contractors and environmental professionals to determine appropriate sensor depths based on site conditions, monitoring goals and regulatory compliance.

This article outlines the key factors to consider when choosing sensor depth in a borehole installation. If you would prefer to speak with a member of our team, you can contact Monitel at admin@monitel.com.au or call (08) 6219 8284.

What are Piezometers?

Piezometers are instruments used to measure pore water pressure within soil or rock.

In boreholes, a piezometer can be used for monitoring water levels and pressure changes over time. This data is critical for understanding site stability and water movement.

If installed at a specific depth, a piezometer will provide data from a targeted layer of the ground. Information like this is used in applications such as dewatering, environmental compliance and slope stability analysis.

Borehole piezometers can be manual (like standpipes) or automated (like vibrating wire or pressure transducer models), depending on monitoring needs.

Why Depth Matters

Pore pressure varies with depth and can be influenced by geology, groundwater flow and changes in hydraulic gradients. Proper depth selection ensures the data is both relevant and reliable.

If a piezometer is installed too shallow, it may not capture critical subsurface conditions. If placed too deep, it may miss changes occurring in more active zones closer to surface activity or structural loads.

Key Considerations

Project Objective

The intended purpose of the piezometer should be the main factor in deciding its depth. For example:

  • Construction dewatering may require shallow installation to monitor drawdown levels.
  • Slope stability assessments often need mid-slope or multi-depth profiling.
  • Tailings dam monitoring typically targets foundation layers or phreatic surfaces.

Geological Layers

Understanding the layers soil and rock on your site is critical.

Installing a piezometer where two materials meet can reveal seepage or pressure changes associated with their different permeabilities. Borehole logs or site investigation data can guide this decision and help you identify where materials interface.

Groundwater Table Fluctuations

In areas where the water table varies due to seasonal change or human activity, select a depth below the expected fluctuation range to ensure consistent data.

In some cases, multiple piezometers can be installed at different depths in the same borehole to monitor vertical pressure.

Regulatory Requirements

Projects regulated by DWER, DMIRS or local council may mandate specific monitoring depths. This is particularly common in environmental licensing and compliance reporting projects.

Monitel references and applies these standards when designing our borehole systems, ensure their compliance.

Typical Depth Placement by Piezometer Type

Your chosen depth may influence the type of piezometer you use. Here are some of the sensors available in our piezometer range and the applications they are suited to:

  • Vibrating Wire Piezometers (VWPs): Often placed at specific stratigraphic targets in the borehole, such as within foundation layers, saturated zones or at the toe of a slope.
  • Standpipe Piezometers: These are typically installed at depths ranging from 5 to 30 metres, with the filter tip is surrounded by sand and sealed with bentonite to isolate the measurement zone.
  • Pressure Transducers: Can be installed at various depths depending on the required data range. It is suited to both shallow and deep installations.
  • Multi-point installations: Use multiple sensors within a single borehole to profile pressure at several depths, useful in complex or layered soils.

Enquire About a Piezometer Solution for Your Borewell

Correct piezometer depth is essential for capturing useful, reliable and actionable pore pressure data.

Factors like site geology, monitoring objectives, groundwater dynamics and compliance requirements must all be considered during the planning process.

If you would like to discuss borehole monitoring on your site, please contact our team at admin@monitel.com.au or call (08) 6219 8284.