Borehole Monitoring and Telemetry in South Africa

Define the record the borehole needs to produce

A farm may need to reconcile pumping with storage replenishment. A facility manager may need to investigate a tank that empties even though the pump appears to run. A water operator may need a consistent abstraction record across several wells. Identify the decision first, then specify the measurements, reporting period and level of detail needed to support it.

Bring the responsible operator, pump or electrical contact and groundwater specialist into the scope where their work is relevant. Provide any existing abstraction and reporting conditions, pumping recommendations and instrument records. The installation should preserve those agreed definitions in its tags, units and reports. A useful first stage gives the team a reproducible account of what was measured and what the pump was doing during the same interval.

Register each well and its measurement reference

Record the well identifier, location, construction information available, casing arrangement, pump setting and access to the headworks. Establish a stable measuring point that a technician can identify on a later visit. Document its relationship to the reporting datum and retain photographs or a drawing. A level change is only comparable when the reference and sign convention remain consistent.

Specify whether the report displays depth to water below a measuring point, water elevation relative to a datum or another agreed quantity. These are different representations of the same observation and need explicit conversion. If the measuring point or sensor position changes during maintenance, record the change time and the revised offset. That prevents an installation adjustment from appearing as a sudden groundwater event.

Survey the headworks and instrument access

Review the route for a level probe, cable support and the available space around the pump installation. The mounting arrangement should allow the intended measurement and future servicing while following the site's wellhead protection procedures. Include cable entries, termination enclosure, access restrictions and the work window. Where pump removal or specialist access is required, identify that dependency before scheduling the telemetry installation.

A submersible pressure instrument needs a range and installation position appropriate to the water column it will observe. The pressure reference and compensation method must suit the selected instrument. Record the sensor type, configuration and any atmospheric-pressure reference or vent arrangements used. The USGS groundwater procedures describe the importance of measuring points, calibration and field checks; those principles help make the telemetry record traceable.

Compare automatic levels with a field reference

Agree how a competent field technician will obtain an independent water-level observation and how close in time it must be to the logger reading. Include the measuring-point correction, sensor offset and any relevant instrument uncertainty. Compare the resulting quantities in the same units and against the same reference. A dashboard value that looks plausible still needs this installation check.

Repeat the comparison after work that could move the probe or alter its reference. Retain both the original and corrected records with a reason for the adjustment. The service procedure should state who checks drift, cable condition and instrument health, and how suspect readings appear in the report while they are being investigated. This keeps maintenance activity visible in the history used by the groundwater or operations team.

Measure abstraction at a defined boundary

Review the flow meter's location, pipe condition, available output and installation requirements. A pulse output needs a documented quantity per pulse. A digital counter needs its units, resolution and behaviour at restart or rollover recorded. Identify any branches between the well and the meter so the reported quantity describes the intended boundary. Existing approved meter outputs can be assessed for integration into the telemetry system.

As a hypothetical commissioning example, a test counter increase of 125 pulses at a configured 10 litres per pulse represents 1,250 litres. This arithmetic checks the conversion; the field comparison must also establish that the meter and signal capture represent the actual flow under the test conditions. Keep the source counter and configuration version so the quantity can be reconstructed after a reporting or instrument change.

Relate water-level behaviour to the pumping history

A pumping period needs a start and finish reference together with the relevant flow or abstraction record. Capture the water level before, during and after the period at intervals selected for the question being investigated. Describe the conditions around the observation, including other wells operating nearby where that information is available. The groundwater specialist can then interpret drawdown and recovery against the actual pumping context.

An operational recovery trace and a formally planned aquifer test have different purposes and observation requirements. Ask the specialist to specify the duration, sampling pattern and supporting information needed for their assessment. Keep their interpretation and recommended operating settings with the relevant record. Routine telemetry then provides a way to see how subsequent operation compares with those agreed conditions.

Connect wellfield operation to receiving storage

For several boreholes feeding a common reservoir, retain the identity and contribution of each well. Align pump state, meter totals and reservoir observations using the agreed time basis. Include other sources and consumer demand where they affect the comparison. A reservoir level that stays flat during pumping may reflect ongoing use, an alternative flow path or a measurement issue; the combined record gives the operator a way to investigate.

The reservoir and water-tank monitoring service covers the storage measurement and response workflow. Scope the link between the two systems explicitly, including who owns the pumping schedule and the receiving-level target. If automatic operation is included, the control engineer defines the local interlocks, permitted commands, manual mode and acceptance tests alongside the monitoring work.

Keep pump operation and protective functions clear

A controller's run command, an auxiliary contact, electrical current and measured water flow establish different parts of the operating sequence. Name each signal according to what it actually proves. Test the proposed combination during authorised start, stop and normal operating conditions. Retain the site's existing protective functions and identify the controls specialist responsible for changes to them.

Alerts can then be configured around an agreed pattern, such as an expected pumping period without the corresponding flow record or a level approaching a site-defined operating limit. Set the review and escalation route with the operator. The alert should carry the well identifier, event time, relevant values and data-quality status so the first recipient can decide what to check or who to call.

Design local logging and power for the installation

Specify the measurement interval separately from the transmission interval. The logger should preserve the timestamps and values needed for the agreed reports, with storage capacity and restart behaviour documented. During an approved interruption test, verify what is retained, how it returns and how unresolved gaps are displayed. Recovered historical readings and a live remote notification are separate outcomes to test.

For an off-grid arrangement, assess the complete load, available solar conditions, battery requirements and service access. Include the instrument, logger and any communications equipment supported by the same supply. Review enclosure exposure and seasonal shading at the intended position. Where LoRaWAN connects the well to a gateway with 4G backhaul, the power and recovery arrangements of that gateway also belong in the service design.

Accept the measurements before relying on the report

Set numerical tolerances and test conditions before commissioning. A failed comparison needs an owner and a retest record. Include the operational user's ability to retrieve an abstraction period, locate a missing reading and explain a configuration change. Handover should leave the customer with a usable record and the procedures needed to maintain it through pump work, instrument replacement and seasonal operation.

Separate installation costs from continuing service

The initial quotation should identify the wellhead survey, level and flow interfaces, logging equipment, power arrangement, communications, installation access, report configuration and commissioning. State who supplies existing pump and well records, who arranges specialist access and who approves the operating definitions. If a wellfield needs several gateway or power arrangements, retain those differences in the asset-by-asset scope.

Ongoing responsibilities include instrument checks, battery or solar-system maintenance, connectivity, platform support and site visits. Identify the owner of manual reference measurements and any specialist interpretation. Reports should remain available to the customer in an agreed format. Expansion to another well can reuse reporting conventions while still requiring its own measuring point, pump information, instrument range and acceptance evidence.

Frequently asked questions

Technical references

The USGS Groundwater Technical Procedures, particularly the measuring-point and submersible-transducer procedures, support the reference and field-check approach. The USGS aquifers and groundwater explanation describes the relationship between pumping and groundwater levels. Sources checked 5 November 2026; installation values and operating decisions follow the actual well information and specialist review.