TL;DR
- Smart sensors provide real-time visibility into flow, pressure, and reservoir levels
- Water monitoring enables energy-efficient pump operation based on actual demand
- Sensor data supports proactive maintenance and asset performance benchmarking
- Accurate measurement is essential for sustainable groundwater management
- Integrated systems turn sensor data into automated operational intelligence
In energy-intensive operations like water distribution, the key to efficiency isn’t just better equipment, it’s better decisions. And better decisions start with better data.
Smart sensors have become the backbone of intelligent infrastructure. When deployed strategically, they provide the real-time insights needed to optimise operations, reduce energy consumption, and ensure the sustainable use of natural resources.
In this post, we explore how Direct Control used smart sensor technology to help the Tonga Water Board (TWB) modernise its remote water supply system, transforming manually operated boreholes and pumps into a responsive, data-driven network aligned with solar energy generation and long-term resource management.
The sensors behind the system
To fully understand system performance and make informed operational decisions, TWB needed to monitor what was happening underground, inside reservoirs, and across the distribution network. Direct Control implemented a sensor suite tailored to deliver actionable insights:
Pulse-counting water meters
- Installed on pipelines to measure cumulative flow volumes
- Provided visibility into how much water was being extracted and where it was going
- Enabled comparison of borehole performance and identification of underperforming wells
Pressure sensors
- Deployed at key points across the distribution network
- Used to detect abnormal pressure drops, potential leaks, or blockages
- Helped optimise pump sequencing and ensure consistent delivery to reservoirs and end-users
Analog level sensors (4–20 mA)
- Installed in each reservoir to monitor water level in real time
- Connected to Delta field controllers using the BACnet protocol
- Enabled automated pump start/stop logic based on dynamic reservoir demand
Water monitoring = energy efficiency
Energy efficiency starts with knowing when to act, and when not to.
With real-time data from flow and level sensors, TWB no longer has to run pumps based on guesswork. Instead, pump activity is precisely aligned with demand, reservoir capacity, and solar energy availability.
Key outcomes include:
- Avoiding unnecessary pump runtime during off-peak periods
- Reducing energy draw from the grid by prioritising solar-powered operation
- Preventing overfilling and reservoir overflow, which can waste energy and water
This level of precision is only possible through continuous water monitoring of system variables and turning sensor data into control logic.
Smarter maintenance with performance data
Traditionally, pump maintenance is reactive, triggered only when a failure occurs. But with sensor-derived performance data, TWB can now take a proactive approach.
For example:
- Run-time counters combined with flow data help detect reduced efficiency or wear
- Sudden drops in flow despite pump activation may signal a blockage or valve issue
- Pressure anomalies can point to pipeline restrictions or leakages
These insights allow maintenance teams to prioritise tasks based on real performance metrics, reducing downtime, avoiding catastrophic failures, and extending asset lifespan.
Water monitoring = Sustainability
Tongatapu’s freshwater aquifer is a fragile resource. It floats atop seawater and is highly susceptible to over-extraction and saltwater intrusion.
Smart sensors play a pivotal role in protecting this critical supply:
- Accurate flow measurement quantifies extraction by site, enabling more equitable distribution
- Data enables TWB to track historical trends and adjust pumping schedules accordingly
- Visibility ensures compliance with environmental sustainability goals and future resource planning
Without these measurements, it’s nearly impossible to manage groundwater sustainably.
From data to decisions
With all sensors integrated into the Tridium Niagara platform, data doesn’t just sit on a screen, it drives automated action.
For example:
- If a reservoir level drops below a setpoint, a specific pump is automatically triggered
- If a pressure sensor detects a fault condition, an alarm is generated for operator review
- If energy from the solar farm is peaking, pump sequencing is adjusted to maximise usage
This automation loop, sensor data triggering real-time decisions, is the foundation of intelligent infrastructure.
Sensors are the nervous system of smart infrastructure
Smart water and energy systems depend on visibility. Without it, operators are left flying blind, reacting to failures instead of preventing them.
Direct Control’s work with the Tonga Water Board demonstrates how the right mix of sensors, backed by a unified control system, can deliver:
- Energy savings through better pump management
- Proactive maintenance and reduced equipment downtime
- Sustainable water resource usage
- Fully automated, real-time decision-making
Read the case study here
