This function accepts a data frame that contains a column named "discharge" and calculates DH18; High flow duration. Compute the average duration of flow events with flows above a threshold equal to three times the median flow value for the entire flow record. DH18 is the average (or median - Use Preference option) duration of the events (days-temporal).
data frame containing a "discharge" column containing daily flow values
dh18 numeric containing DH18 for the given data frame
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