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Sewer Network Model Calibrations

Flow and rainfall monitoring designed to calibrate your hydraulic model, scored storm by storm.

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At a glance

  • Every 1 to 5 minutesFlow and rainfall logged at high resolution
  • At least three stormsBefore a calibration may be called verified
  • Published acceptance bandsPeak flow, event volume and peak timing scored
  • Ready for EPA SWMMRTK parameters, with SWMM 5, GeoJSON, Excel and CSV exports

A hydraulic model is only as good as the field data behind it. EDS designs and delivers the monitoring programs that calibrate new models and bring existing ones back into line with the network, from the first site visit to the final dataset.

Modelling is how communities plan and future-proof their wastewater infrastructure. To simulate the network properly in dry weather and in storms, the model needs high resolution flow and rainfall data from the pipes themselves.

Today’s modelling platforms can take flow and rainfall data in near real time. The limit is no longer the software. It’s the accuracy of what goes in.

Whether you’re building your first model or recalibrating one you’ve had for years, we’re ready to help. Our team has worked with major councils and utilities across Australia, and we know what defensible data looks like to the engineers who have to stand behind it.

Measured data can change the plan as well as the model. When a regional water authority recalibrated its hydraulic model with temporary flow monitoring, the data showed infiltration was well below what had been modelled. Rehabilitation funds were moved, and the high risk catchments were prioritised properly.

Looking down a manhole to a sensor bracket fixed across the invert of the pipe, with the sensor cable running up the shaft
A monitoring site: the sensor bracket across the invert, cabled to a logger at the top of the shaft. Sites are chosen by their hydraulics, so the model is calibrated to readings it can trust.

What a calibration program needs

High resolution flow and rainfallFlow logged typically every 1 to 5 minutes, with rain gauges in the catchment, so storm peaks and the daily pattern are both captured.
Dry and wet weatherA model has to match the network in dry weather and in storms, so monitoring runs long enough to record both.
Sites chosen by their hydraulicsPre-installation inspections assess hydraulics, access and the risk of ragging or debris before a meter goes in.
Validated dataContinuous QA/QC, calibration checks and verification of the depth to velocity relationship, so the model is never tuned to a faulty reading.

Calibration scored storm by storm

A single score across a whole record can look respectable while the model misses every storm peak. In EDS FlowSense, each storm is scored on its own, to the CIWEM UDG Code of Practice for the hydraulic modelling of sewer systems (2017).

  • Published acceptance bands

    Peak flow within −15% to +25%, event volume within −10% to +20%, and peak timing within one hour. An event passes on peak and volume together.

  • At least three storms

    A calibration needs three assessable storms before it may be called verified. With fewer, it is reported as insufficient events rather than quietly passed.

  • Validated on independent storms

    RTK unit hydrographs fitted per catchment are checked against storms that were not used to fit them, with a scorecard for each.

  • Ready for your modelling platform

    RTK parameters compatible with EPA SWMM, and exports in EPA SWMM 5, GeoJSON, Excel and CSV.

Common questions

How long should calibration monitoring run?

Long enough to record dry weather flow and several significant storms. Because a calibration needs at least three assessable storms before it can be called verified, the duration depends on the season and the rain that falls. Short term programs commonly run for 6 to 12 weeks.

Can you work with our existing model?

Yes. EDS supplies monitoring to calibrate a new model or re-calibrate an existing one, with flow and rainfall data delivered in formats modelling platforms can import, or by API.

Who carries out the calibration?

EDS designs and delivers the monitoring program, and can work through the calibration with your modelling team or consultant. FlowSense scorecards mean everyone works from the same results.

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