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Thermal Infiltration Surveys

Thermistor strings and open channel flow meters used together to pinpoint where groundwater is getting 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 narrows the cost of works

Flow monitoring shows how much infiltration a catchment has. Temperature shows where it is getting in. Groundwater and surface water usually enter a sewer at a different temperature from the wastewater already in the pipe, so a string of temperature sensors laid along the pipe registers the change at the point of entry.

EDS combines Beadedstream thermistor strings with open channel sewer flow meters. When a crack opens, the sensors nearest it shift while the flow meter records the extra water arriving, so infiltration is located as well as measured.

Temperature studies are not limited to sewers. EDS delivers short to long term temperature studies in water networks and most other atmospheric or pressurised reticulated networks.

Why combine temperature and flow

Accuracy and sensitivityTemperature locates infiltration and flow quantifies it, so even minor ingress points show up early.
Continuous monitoringBoth record continuously in near real time, so new infiltration points are picked up as they appear.
Non-intrusive installationStrings go in through existing manholes and inspection points, with no excavation or shutdown.
Built for sewersRobust, waterproof sensors that stand up to corrosion, chemicals and physical damage.
Targeted repairsKnowing where water enters narrows the scope, and the cost, of remedial work.

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