This function accepts a data frame that contains columns named "discharge","month_val" and "year_val" and calculates the Variability (coefficient of variation) across minimum monthly flow values. Compute the mean and standard deviation for the minimum monthly flows over the entire flow record. ML13 is the standard deviation times 100 divided by the mean minimum monthly flow for all years (percent-spatial).
data frame containing a "discharge" column containing daily flow values
ml13 numeric value of ML13 for the given data frame
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