Page tree

Versions Compared


  • This line was added.
  • This line was removed.
  • Formatting was changed.

Highlights of Source eWater is pleased to announce the latest Production Release of Source version 4.9.   Version 4.9 contains the new and updated features developed over the past 6 months since v4.7, along with stability and performance improvements.  Version 4.9 include:

  • fixing the problem of different machines giving different results (for two models)
  • 'removal' script for plugins
  • improvements to the Geographic Map tool,
  • Lascam plugin
  • calibration performance improvements
  • filter on data sources
  • timeseries flux for on-farm storages
  • calculation of total distribution losses
  • run period of the model should not be limited by observed data
  • recorder sets
  • ownership recorders in weirs and off allocation
  • saved run information in the Results Manager
  • changes to stop Modelled Variables breaking when the Function they point at is moved
  • improving the handling of distribution system loss with travel time
  • improvements to Weirs, including mass balance for constituents with lumped routing
  • charting improvements


This is most but not all of the things listed in the beta release notes, I don't really know what's important! All of the stuff that had content is copied below.

The table of contents seems to automatically generate, not sure how I get all the above into it.also fixes a problem found in two Source models, where the same model would give different results on different computers.  Plugin developers should read the details below.
Highlights of Source Version 4.9 include:

Table of Contents


Different results on different machines has been fixed!




details for the issue of different results on different machines:

Source uses the Microsoft .NET framework, the problem was caused by 2 functions in the System.Math library. Both System.Math.Pow() and System.Math.Exp() can give different results for some number combinations on different machines. For individual function calls, different results occurred at 0.09% of the time with our randomly generated test data. We believe the issue is from different CPU’s implementing different optimisations to perform the operations as efficiently as possible. The functions are not implemented directly within the Microsoft .NET framework, instead, they are implemented in the Microsoft C run-time libraries which are used by the .NET framework, as well as by a number of other languages including C++. So the nature of the .NET framework, which is an interpreted language, wasn’t part of the issue and the same results would have been obtained if implemented in C++. We have since tested all available System.Math functions and these are the only two we have found that can produce different results on different machines. The vast majority of models don’t see the issue since the differences are very minor and for an individual operation, the difference is only at the last decimal place. However, for very large models with lots of feedback in the model , when the issue occurs it can snowball into meaningful result differences.

To fix it, we implemented new versions of the two functions that produce consistent results on different machines. The problem has only been detected in 2 Source models, which happen to be 2 of the largest and most complicated. With the fix, we are now getting consistent results for both models, across different machines that were previously giving different results. There will be changes for Plugin developers to use the same functions we are using, instead of the inbuilt System.Math functions when using Pow or Exp. We recommend plugin developers to use the new implementations of the functions which are in the TIME.Science.ConsistentMaths class within the TIME assembly.We have approached Microsoft about the issue and they are yet to respond: Microsoft Developer Community: Math.Pow and Math.Exp produce inconsistent results

This was a really difficult problem to isolate and fix. We are VERY happy that we worked it out!!

Plugin removal

Plugins that need persistence can now include a removal script so plugins can remove themselves from a project when they are not needed or have been added accidentally.  The tool is available in: Tools \ Remove Plugin from Project File.

Image Removed

There is an example provided in the Example Node model plugin.

Model changes to carryover rules over time

Carryover configuration in Resource Assessment can now change over time to assist with calibration. 

Image Added

Map tool improvements

The tool is available under Tools > Analysis Windows > Map... It now works better for constituents and comparing multiple runs.


The Lascam plugin now includes better value ranges to help determine appropriate ranges to use when calibrating.

Calibration performance improvements

Geoff - is there anything to put here?The calibration tool is now faster for all models. Models with a large number of parameters will see the greatest benefit. 

Data Sources



There is now a filter for when looking for a data source or its usage:


Lascam Plugin improvements

The Lascam plugin now includes better value ranges to help determine the appropriate ranges to use when using the calibration tool to calibrate the rainfall-runoff model.

TimeSeries flux for on-farm storages

On-Farm storages at a water user node can now have define a "Timeseries Flux "to assist with calibration. Water added to the On-Farm Storage by the Timeseries Flux functionality only occurs during the Flow Phase. This is in addition to any other Water User Ordering and extractions.  The water delivered by the timeseries flux is not actually extracted from the Supply Point”Point.

Calculation of Total Distribution Losses

We have modified how distribution losses are calculated. 


Charting tool changes

Chart settings have been redone to improve chart stability. 

Plugin removal tool

Plugins that need persistence can now include a removal script so plugins can remove themselves from a project when they are not needed or have been added accidentally. 

The tool is available in: Tools \ Remove Plugin from Project File.

Image Added

There is an example provided in the Example Node model plugin.

Minor changes

  • The Geographic zoom tool has been fixed and improved.
  • The run period was constrained when some observed data had been included.  We have removed this restriction to allow the model run period to be longer than observed data in the model.

  • Changes to "Safe Release" functionality for storages with multiple outlets. See: Storage node - OperatingConstraints

  • Improvements to recorder sets, See: Configuring Scenarios - Recorder Sets
  • Scenario Input Sets, Recorder Sets and Functions can be searched using Ctrl+F
  • Run information is now saved in the Results Manager. See: Results Manager - Scenario Run Metadata

Plugin Developers


  • We have improved the performance of editing large constituent models.
  • Changes to stop Model Variables breaking when Functions are moved.
  • Improvements to handling distribution loss at Supply Points with travel time. See: Supply point node - Distribution Loss
  • Improvements to Weirs, including fixing mass balance for constituents with lumped routing.
  • Orders can now be redistributed to different accounts at extraction time for use debit accounts. See: Resource assessment - Usage

Community Plugins

Arrange Nodes plugin

You can now use the Arrange Nodes community plugin to rearrange all the schematic nodes of a network. This can be particularly handy if you have built a model starting with a Geographic Scenario. CommunityPlugins \ SourcePlugin.ArrangeNodes.dll

NetLPMonthly Optimiser

A number of changes to the NetLP Monthly Optimiser have been implemented:

  • An option to allow the export of model input settings to excel has been added
  • Allow adjustment of forecast inflows for 2nd and third replicates
  • New recorder "Requirement" for look ahead period in Arc Flows

Plugin Developers 

We are currently on .net 4.6.2, which hasn't changed from Source 4.7. We are planning on moving to C# 7, Visual Studio 2019 and .NET 4.8.0 soon, so you will need to make sure you have updated Visual Studio to continue developing plugins in the beta versions. We also intend to move to .NET 5 in 2020. .NET 5.  Note the section above on the fix for different results from the same model on different machines.

Results and Configuration Changes

Some results have changed between Source 4.5 7 and Source 4.79. Result changes are mostly around XXXXXXXXXXX. The Annual Accounting, Weirs and specific ordering settings. The eWater development team maintains a detailed system to track when results vary between different version of Source. The details at the following link will help you work out why the results have changed, and any alterations you may need to make to your model configuration. Details of result changes: 4.9 Result Changes from 4.7