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What functionality does Flood Modeller Free provide?

Flood Modeller Free provides the same great functionality as Flood Modeller Pro for use on smaller projects, limited to 250 1D nodes and 100,000 2D cells; across all three 2D solvers (ADI, TVD and FAST).

Is there a restriction on model building in Flood Modeller Free?

You can only build 1D models up to the 250 node restriction within Flood Modeller Free, however there are no restrictions when building a 2D model.

Flood Modeller Free restricts you from running model simulations that are greater than 250 1D nodes and 100,000 2D cells.

There are also no restrictions when viewing models or their results.

Will Flood Modeller work on an Apple machine?

Flood Modeller is designed to work on Microsoft Windows.

What is the recommended computer specification for Flood Modeller

The recommended computer specification for Flood Modeller Pro is detailed below:

  • 1920 x 1080 pixel display
  • Intel Quad core processor 3.2GHZ
  • 8GB Memory
  • 500GB Hard disk space free
  • Windows 10 64bit (Windows 8 is also compatible)

If you are building a dedicated modelling machine, some of the above can be further upgraded. For example, increasing the RAM to 16GB or higher would potentially increase the speed of model runs and provide outputs quicker than if you were to use just 8GB.

With regards to the hard disk, we are often asked whether a SSD should be used. A SSD would provide a slight improvement over a HDD in loading speeds for users adding data into Flood Modeller Pro. However, it wouldn’t improve the simulation speed in any way.

What functionality does my licence provide?

The simplest way to do this is within the Flood Modeller user interface, by clicking on the ‘Start’ tab, then selecting ‘License information’.

Another method is to load the CodeMeter Control Centre and to select ‘Web Admin’. This will open CodeMeter Web Admin within your web browser. Select ‘Licence Monitoring’ -> ‘All Licenses’, and this will detail the available licences.

Why is Flood Modeller opening in ‘Free’ mode and not ‘Pro’ mode?

We are often asked why Flood Modeller Free is opening instead of Flood Modeller Pro. Assuming you have access to a ‘Pro’ licence, it is often very easy to resolve this issue and is dependent on the type of dongle being used – Sentinel or WIBU.

Sentinel dongles

If you are using one of our Sentinel dongles, please ensure that the .SET files are copied into the following folder: C:\Users\<User Name>\AppData\Roaming\Flood Modeller. Historically, these files needed to be copied to the \bin folder which is no longer the case (unless you are using older versions of our software)

If this still does not resolve the issue, and you have recently installed an updated version of Flood Modeller Pro, the dupdate.exe file (found in the Flood Modeller folder) may also need to be run whilst the dongle is plugged into your machine. The dupdate file updates your dongle, allowing access to that particular version of the software (assuming you have a valid support and maintenance contract with CH2M).

WIBU dongles

Whereas Sentinel dongles rely on .SET files, WIBU dongles are hard coded and only required licence files if you are upgrading your licence or renewing your annual support and maintenance contract.

If you find that Flood Modeller is opening in ‘Free’ mode, your licence file will most probably need updating.

Please create a licence file and email it to our support team who will extend the licence validity or support and maintenance expiry date.

If all of the above do not resolve this issue, please double-check that your dongle is being read by your machine within Device Manager (under Control Panel) as your USB may have become faulty.

How do I set up the Flood Modeller-TUFLOW link?

In order to link the software, Flood Modeller Pro needs to be able to 'see' the TUFLOW engine files. This can be done in two ways:

Option 1

Users should add the location of the TUFLOW files (e.g. C:\TUFLOW\w64) to the [Preferences] section of the settings file formsed.ini (located here: [AppData]/Roaming/Flood Modeller).

There are three options available for this:

  1. TUFLOWPATH=… (this contains an explicit path to the 32 or 64-bit TUFLOW installation)
  2. TUFLOWPATH32=… (this can only contain the path to the relevant 32-bit installation)
  3. TUFLOWPATH64=… (this can only contain the path to the relevant 64-bit installation)

Note: [AppData] is usually located in the C:\Users\<Username> folder. It is usually hidden, therefore you may need to change a setting in your operating system to show hidden folders

Option 2

Users should add the location of the TUFLOW folder (e.g. C:\TUFLOW\w64) to the system path, by adding this path name to the user's PATH environment variable.

Note: The Environment Variables settings can be found here: Start > Control Panel > System > Advanced Tab> Environment Variables

The path to the TUFLOW files can be added to the user or system variables section. However, only one path to a folder containing TUFLOW executables should be contained in the user and system variables section of the Environment Variables window. Therefore, take care to check for PATH variables in both sections. When a new path is added to the path variable it should be separated from the previous path using a “;”.


Once option 1 or 2 has been completed, Flood Modeller Pro needs to be closed (if it was open during the editing) and re-opened in order for the changes to be applied.

You should now be able to start your Flood Modeller Pro-TUFLOW linked simulation. For additional information with regards to linking Flood Modeller Pro with TUFLOW, click here

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