This function accepts a data frame that contains a column named "discharge" and calculates DL11; Annual minimum daily flow divided by the median for the entire record. Compute the minimum daily flow for each year. DL11 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
dl11 numeric containing DL11 for the given data frame
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