This function accepts a data frame that contains a column named "discharge" and calculates DL10; Variability of annual minimum of 90-day moving average flow. Compute the standard deviation for the minimum 90-day moving averages. DL10 is 100 times the standard deviation divided by the mean (percent-spatial).
data frame containing a "discharge" column containing daily flow values
dl10 numeric containing DL10 for the given data frame
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