This function accepts a data frame that contains a column named "discharge" and calculates DH19; High flow duration. Compute the average duration of flow events with flows above a threshold equal to seven times the median flow value for the entire flow record. DH19 is the average (or median-Use Preference option) duration of the events (days-temporal).
data frame containing a "discharge" column containing daily flow values
dh19 numeric containing DH19 for the given data frame
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