#' Stream Water Quality
#'
#' Whole-water or total phosphorus data for selected USGS streamgages for
#' calendar year 2003.
#'
#'
#' @name QWall
#' @docType data
#' @usage QWall
#' @format Data frame with 23 rows and 4 columns\cr
#' \tabular{lll}{
#' Name \tab Type \tab Description\cr\cr
#' STAID \tab character \tab USGS station number\cr
#' DATES \tab Date \tab Sample date\cr
#' TIMES \tab character \tab Sample time\cr
#' R00665 \tab character \tab Remark code for total phosphorus concentration\cr
#' P00665 \tab numeric \tab Total phosphorus concentration\cr
#' } Note: all
#' concentrations are in milligrams per liter as phosphorus.\cr
#'
#' @source Data retrieved from NWISWeb
#' (\url{https://nwis.waterdata.usgs.gov/mn/nwis/qw}) on 2005-01-05.
#' @keywords datasets
#' @examples
#'
#' data(QWall)
#' # Plot the data for station 05078770
#' with(subset(QWall, STAID == "05078770"), plot(DATES, P00665, log='y', ylim=c(0.001, 0.2)))
#' # Overlay the data for station 05078470, smaller values and missing the sample in late April.
#' with(subset(QWall, STAID == "05078470"), points(DATES, P00665, col='red'))
#'
NULL
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