makeWaterYear: Make Water Year Column
In MGBT: Multiple Grubbs-Beck Low-Outlier Test

Description Usage Arguments Value Author(s) References See Also Examples

Make water year, year, month, and day columns from the date stamp of a U.S. Geological Survey peak-streamflow data retrieval from the National Water Information System (NWIS) (U.S. Geological Survey, 2019) in an R data.frame into separate columns of the input data.frame.

1	makeWaterYear(x)

`x`	A `data.frame` having a mandatory column titled `peak_dt` presented by `as.character`. No other information in `x` is consulted or otherwise used.

The x is returned with the addition of these columns:

`year_va`	The calendar year extracted from `peak_dt`;
`month_va`	The optional month extracted from `peak_dt`;
`day_va`	The optional day extracted from `peak_dt`; and
`water_yr`	The water year, which is not equal to `year_va` if `month_va` is greater than or equal to 10 (October).

W.H. Asquith

U.S. Geological Survey, 2019, USGS water data for the Nation: U.S. Geological Survey National Water Information System database, accessed October 11, 2019, at doi: 10.5066/F7P55KJN.

splitPeakCodes, plotPeaks

  # The dataRetrieval package is not required by MGBT algorithms.
  PK <- dataRetrieval::readNWISpeak("08167000", convertType=FALSE)
  PK <- makeWaterYear(PK) # Note: The convertType=FALSE is critical.
  names(PK) # See that the columns are there.