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This can be achieved by using the display vertical lines with comments.
Step 1:
Create a CSV file containing the information you would like to show in Delft-FEWS. The value column is needed to create a time series in Delft-FEWS.
COMMENT;DATE;VALUE
Comment 1;01-12-2022 12:00;1
Comment 2;01-12-2022 15:00;1
Comment 3;01-12-2022 16:00;1
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