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Does Flood Modeller generate flood maps automatically?

Flood depth grids (or flood extent polygons) can be generated automatically. For 1D flood mapping, a TIN needs creating and will influence the quality of the resulting flood map.

What functionality does the Free edition of Flood Modeller provide?

The Free edition provides the same functionality as the Standard and Professional editions, but it is limited to 100 1D nodes and 100,000 2D cells; across all three 2D solvers (ADI, TVD and FAST).

How do you open and edit existing .ied files using Flood Modeller ?

To add an existing event file to a Flood Modeller project: Right-click on the 'Event data' section of the project panel and select 'Add Item' in the displayed menu. Browse to your required ied file. Once selected in the browse window click the Open button and the file will be added to the Event data section of the project panel (usually located in the upper left corner of interface).

To edit an event file just highlight it in the Project panel and double click on the ied file entry. A new window should be displayed that lists the units contained in the ied file. Double-click on one of these to access the associated node properties window to inspect current settings and make any changes. You will be prompted to save any changes you make when you close the window that lists the ied file contents.

Note that this function currently requires you to also have a 1D network file loaded in the project (it can be any dat file, i.e. even unrelated to the event data). Also Flood Modeller does not currently let you add or remove units from an existing ied file. To change the units within a file you would need to define a new event file as a subset of a 1D network. The method for doing this is explained in “How to Define New Event Data for a 1D Model?” within the Flood Modeller User Guide.

Is there a restriction on model building in the Free edition?

You can only build 1D models up to the 100 node restriction within the Free edition, however there are no restrictions when building a 2D model.

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

What are the governing equations used in Flood Modeller?

Full solution Saint Venant (1D) and Shallow Water Equations (2D) as well as a simplified solution in the FAST solver. Full details are provided in the technical documentation.

Are tutorials or model data available for new users?

Yes, tutorials and example data sets are available under the 'Help and Support' section on our website and from within the software installation.

What do I do if Bing Maps stop working?

You can reset the map functionality by pressing the default Bing Map key button in the General Settings window (and then restarting Flood Modeller to apply the change).

The 'run box' only has 2 tabs, but previously there were a lot more tabs to adjust various parameters.

They are hidden from the default view to make it easier to see the essential tabs. The other tabs can be switched on from View > Tabs (and will be remembered for next time).

Can you select multiple results files to show on long sections/time series?

Yes, you can compare results from multiple simulations on the same graph.

Can you import HEC-RAS files into Flood Modeller?

Yes, you can import HEC-RAS cross-section data directly into Flood Modeller.

How large is my model and is my licence sufficient?

With 1D models, if you right-click ‘General’ in the Network Panel tab (top of your nodes list), and left-click ‘Properties’, the ‘General Systems Parameters’ window will open. In this window, ‘Node Count’ lists the number of nodes in your model.

Running your 1D and/or 2D simulation will also reveal the number of nodes and/or cells in your model. If your model crashes, the .log or .zzd files produced will list this information.

What is the difference between 1D and 2D flood modelling?

1D modelling solves the 1D equations of flow in channels. A single water level, velocity and flow rate is calculated for each cross-section/node within the model. It also includes 1D equations for 'point features' such as weirs, bridges, sluices and other structures.

2D modelling solves the 2D equations of flow using a variety of methods (e.g. Alternating Direction Implicit or Total Variation Diminishing). It is usually carried out to calculate water depth and 'depth averaged' velocity on a grid or mesh. 2D modelling requires a digital terrain model (DTM) and/or bathymetry of channels.

Click here for an overview of 1D and 2D flood modelling.

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