This function accepts a data frame that contains a column named "discharge" and calculates the variability in base flow index 1. Compute the standard deviation for the ratios of minimum 7-day moving average flows to mean annual flows for each year. ML18 is the standard deviation times 100 divided by the mean of the ratios. (percent-spatial)
data frame containing a "discharge" column containing daily flow values
ml18 numeric value of ML18 for the given data frame
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