This function accepts a data frame that contains a column named "discharge" and calculates DH4; Annual maximum of 30-day moving average flows. Compute the maximum of 30-day moving average flows. Compute the maximum of a 30-day moving average flow for each year. DH4 is the mean (or median-Use Preference option) of these values (cubic feet per second-temporal).
data frame containing a "discharge" column containing daily flow values
string containing a "mean" or "median" preference
dh4 numeric containing DH4 for the given data frame
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