In this folder there are styles of the different objects that you can find in the map of the catchment.
In order to use them correctly in your QGIS environment, click on the layer that you want to modify and then "Properties".
Under "Symbology", click "Style" and then "Load Style". Check only the box "Symbology" and load the file from the directory where you downloaded the "Styles" folder.



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Special note for WWTP: if you want to have them classified by their size, you need to have an extra column in the WWTP shapefile called "class". In this column, we have a value of 1 for WWTP < 10000PE and 2 for WWTP >= 10000 PE.
Here is the equation that you can insert in the field calculator:

CASE

WHEN "PE" < 10000 THEN 1
WHEN "PE" >= 10000 THEN 2

ELSE NULL

END
