This function accepts a data frame that contains a column named "discharge" and calculates DH11; Annual maximum of 1-day moving average flows divided by the median for the entire record. Compute the maximum of a 1-day moving average flow for each year. DH11 is the mean of these values divided by the median for the entire record (dimensionless-temporal).
data frame containing a "discharge" column containing daily flow values
string containing a "mean" or "median" preference
dh11 numeric containing DH11 for the given data frame
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