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04/01/2016 21:50:25

 How is information on hydrology and rainfall is provided in the model?
Is there a guide to do?
thank you


Flood Modeller Support

05/01/2016 09:48:45


There are a number of options for defining a rainfall input into a 2D model. All of these are defined within the 2D simulation window (i.e. define a new 2D simulation in the simulations section of your Project):

  • On the Domains > Boundary Conditions tab you can define a new boundary and assign to this a 1D hydrological event file (ied file). This can utilise any of the 1D hydrological boundary nodes to define a flow input. The input must be associated to a polygon shapefile to define the area over which the input will be applied.
  • On the Domains > Rainfall/Infiltration tab you can define a direct rainfall input. This can be defined by a time series csv file, by a 1D hydrological event file or be user entered directly in the interface. Furthermore this option also allows you to define a spatial loss component if required. Again the input must be associated to a polygon shapefile to define the area over which the input will be applied.
  • On the Domains > Options tab you can apply a global rainfall depth (or specify an ascii grid to represent a spatial array of depths) as an initial condition for your model. This option can be used with the FAST solver to estimate surface water flooding due to particular rainfall event.

Further information on these topics can be found in the user guide if you search for "direct rainfall/hydrology" in the user guide search tool (the page you want is Technical reference > 2D simulation details > rainfall / infiltration tab). There is some additional infomation on the Technical reference > 2D simulation details > boundary conditions tab page as well and the guide also has pages explaining the different hydrological boundaries available.

I hope this is information is useful and gets you started with your hydrological modelling.

Best regards


Flood Modeller Development Team



05/01/2016 14:20:57

Bob thanks for answering

I understood little by little
Actually, I want to simulate a flood stage in a wetland in my area of study.
I want to know how much water can support the wetland to overflowing.
I recreated the simulation example that brings the model, in my area of study. My question is, what other information must be added to the model? to have responsible simulations.

I have a DTM, active area, polyline, any advice will greatly help

Best regards


Flood Modeller Support

05/01/2016 18:45:30

Is the rainfall you want to add to the model falling on the modelled area or falling elsewhere and then being converted to an inflow for the modelled area?

If the former then the rainfall can be applied as a time series to the active area polygon (or a sub-area of this).

If the latter then you could define a suitable hydrological boundary (1D event file, *.ied) and either add it to the model (maybe associated to your polyline if this has been defined to represent a model inflow boundary?) or run it separately as a 1D model and then add the output time series to the 2D model as a standard 2D inflow boundary.

Hope this helps - I would also recommend you take a look at the user guide as this should provide useful additionl information.


05/01/2016 20:04:11

Bob, Again thanks for replying

I think I'll need for the two configurations, the wetland has two natural storm sewers, which are not connected to the wetland (in dry season) and are separated by a vegetable bark.

When it rains (not only in the area of wetland, but also elsewhere and then come to the wetland areas) increase water levels in the wetland,
also channels rains overflow, flooding appearing around the wetland... Is it possible to show a picture of my modeling scheme ?


10/11/2016 08:46:37

How "to define a spatial loss component" ?

In a 2D xml config file ; under DOMAINS/Rainfall/Infiltration, when I create a new hydrology source with Loss Method SCS Curve Number, I have to join a Loss Shapefile.

What are the expected attributes for this shapefile ?  I guess I have to provide at least CN in a dedicated field.

Thanks in advance.


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