read.flows: Read .csv or .Rdata file of streamflows
Description
Reads .csv or .Rdata files of daily streamflow time series. Recognizes
several formats, including those used by Water Survey Canada and the United
States Geological Survey. Uses read.csv() or load() functions from base package,
returns data frame with ID, Date, and Flow, and, if available,
associated quality codes and source agency. Replaces negative values that are
sometimes used to denote missing data with NAs.