This function accepts a data frame that contains a column named "discharge" and calculates RA3; Fall rate. Compute the change in flow for days in which the change is negative for the entire flow record. RA3 is the mean (or median-Use Preference option) of these values (cubic feet per second/day-temporal).
data frame containing a "discharge" column containing daily flow values
string containing a "mean" or "median" preference
ra3 numeric containing RA3 for the given data frame
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