Computing Flooding Region
The purpose of this function is to bound a region that might be flooded under
certain conditions. For this, the rivers network (cadastral map having a river name as an attribute)
is used, the altimetry represented by a regular grid, that is, the sampled positions in
each river (downstream distance) and, for each position, the flood value, already added to the points height.
Besides this, the file has each river's name so the association between the inundation heights and
the corresponding river is possible.
The result is a numerical grid with inundation height values in the region Flooding Region and a
negative value in all other positions. To visualize this spot it is possible to generate,
later, a numerical IL, giving a class, or classes for all the flood height values.
Computing the Flooding Regions:
- activate, in the "Control Panel", the numerical information layer that has
the altimetric grid
- click on DTM, in the main menu, and select Hydrological Processes - Flooding Region... to open the
associated window;
- Select, on Input IL, the grid option;
- Click on the input IL to select a cadastral IL which has the rivers vector representation;
- Use the Directory... button to set the path to the file which has the inundation heights
to be selected, or type this path and click on CR;
- Select the desired file among the ones listed;
- click on Category... to select
the category for the IL that will be created. The
" Categories"
window is presented. By default, only the categories of the numerical model are
presented. After selecting the category, click on Apply
in this window;
- give the Output IL name that has to be different than the active IL name;
- set number of bits in the Output grid, the user can choose between 32 or 64 bits;
- click on Apply to generate the grid that has the Flooding Region.
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