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When the transformation module needs to use a rating curve for a given location at a given time, then it will search all rating curves for the given location id. From all rating curves with the given location id, it will use the rating curve that is valid for the given time. For each location and each point in time there can be only one rating curve that is valid for that location and that time
It is also possible to have different rating curves with the same location id, the same rating curve type and with overlapping valid periods, as long as they have different rating curve ids. This makes it possible to have rating curves with valid periods that only have a start date (no end date), which are valid until the next rating curve with the next start date becomes valid. In this case, if multiple rating curves are valid for a given time, then the transformation module will use the rating curve that has the most recent start date in its valid period.
The ratings are either "qhrelationtable" or "simpleratingcurve" refer to by the hydroMeteoFunction in the transformation module. An example of the reference from the transformation module is shown below:
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