The function reads .CD3 files once these are in a local folder: these files contain information on the gauging station and on the catchment upstream the station.
the NRFA station number(s) for which the .CD3 file (names
the file.path of the WINFAP files, i.e. the location in which the
a data.frame with information on the catchment descriptors for the station
Information on the .CD3 files and river flow gauging in the UK can be found at the National River Flow Archive website https://nrfa.ceh.ac.uk. Specific information on the catchment descriptors can be found at https://nrfa.ceh.ac.uk/feh-catchment-descriptors
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