The following flags are used on the website to describe the quality of the flow data.
Good – the data has been manually inspected and there are no obvious or known data issues.
Estimated – a manual change has been made to the data with confidence.
Suspect – a change cannot be made but the data is felt to be inaccurate.
Unchecked – raw input data that has not been inspected manually.
Missing – data has been deleted or never arrived in the archive.
Percent valid – the percentage of 15 min (instantaneous) flow data available to calculate the daily mean.