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Thermal Infiltration Surveys

Thermistor strings and open channel flow meters, used together to pinpoint where groundwater gets into a sewer.

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At a glance

  • Temperature finds itThe sensors nearest the entry point shift first
  • Flow measures itAn open channel meter records the extra water
  • No excavationStrings go in through existing manholes
  • Targeted repairsKnowing where water enters cuts the cost of works

Flow monitoring shows how much infiltration a catchment has. Temperature shows where it gets in. Groundwater and surface water are usually a different temperature from wastewater. A string of sensors along the pipe picks up the change where they enter.

We pair Beadedstream thermistor strings with sewer flow meters. When a crack opens, the nearest sensors shift and the flow meter records the extra water. So you get the location and the amount.

It’s not just for sewers. We also run short and long temperature studies in water networks and most other piped networks, pressurised or not.

Illustration: a thermistor string along the pipe and a flow meter downstream. The temperature changes at the sensors nearest the defect.

Why combine temperature and flow

Accuracy and sensitivityTemperature finds infiltration and flow measures it, so even small entry points show up early.
Continuous monitoringBoth record in near real time, so new entry points are picked up as they appear.
No digging, no shutdownStrings go in through existing manholes and inspection points.
Built for sewersRobust, waterproof sensors that stand up to corrosion, chemicals and physical damage.
Targeted repairsKnowing where water enters narrows the scope and cost of repairs.

Typical uses

  • Locating the infiltration an I&I study has measured
  • Prioritising CCTV inspections and repairs
  • Intermittent infiltration that conventional methods miss
  • Temperature studies in water and other pressurised networks

How a program runs

From the first call to data you can act on.

  1. 01

    Scope and site selection

    Agree what the data has to answer, then choose sites by their hydraulics, not their convenience.

  2. 02

    Install and commission

    Trained EDS crews install intrinsically safe instruments, Australia-wide, and check every site before it goes live.

  3. 03

    Monitor and validate

    Readings arrive over 4G into FlowSense, with continuous QA/QC and alarms when something changes.

  4. 04

    Report and recommend

    Validated data and a report that shows where the problems are and what to fix first, or a feed into your model by API.

Talk to the people who measure it.

Tell us about your network, site or project. A real person from our team will come back to you.

Start an enquiry 1300 721 683