R/EasternIowaNO3.Rd.R

In USGS-R/smwrData: Example hydrologic data to support statistical methods in water resources

#' Groundwater Quality
#' 
#' Selected nitrite plus nitrate concentration data from wells in the National
#' Water-Quality Assessment (NAWQA) Program in the eastern Iowa study unit
#' survey.
#' 
#' 
#' @name EasternIowaNO3
#' @docType data
#' @usage EasternIowaNO3
#' @format Data frame with 30 rows and 12 columns\cr
#' \tabular{lll}{ 
#' Name \tab Type \tab Description\cr\cr
#' su_code \tab character \tab Study unit code\cr
#' site_no \tab character \tab USGS station number\cr
#' C1sample_dt \tab Date \tab Cycle 1 sample date\cr
#' C1sample_tm \tab character \tab Cycle 1 sample time\cr 
#' C1time_zone \tab character \tab Cycle 1 time zone datum\cr
#' C1Nitrate.rmk \tab character \tab Cycle 1 remark code for nitrite plus
#' nitrate concentration\cr
#' C1Nitrate \tab numeric \tab Cycle 1 nitrite plus
#' nitrate concentration\cr
#' C2sample_dt \tab Date \tab Cycle 2 sample date\cr
#' C2sample_tm \tab character \tab Cycle 2 sample time\cr
#' C2time_zone \tab character \tab Cycle 2 time zone datum\cr
#' C2Nitrate.rmk \tab character \tab
#' Cycle 2 remark code for nitrite plus nitrate concentration\cr
#' C2Nitrate \tab numeric \tab Cycle 2 nitrite plus nitrate concentration\cr
#' } Note: all
#' concentrations are in milligrams per liter as nitrogen.\cr
#'
#' @references Sadorf, E.M, and Linart, S.M., 2000, Ground-water quality in
#' alluvial aquifers in the eastern Iowa basins, Iowa and Minnesota: U.S.
#' Geological Survey Water-Resources Investigations Report 00-4106, 46 p.
#' @source Data retrieved from NWISWeb
#' (\url{https://nwis.waterdata.usgs.gov/ia/nwis/qw}) on 2012-06-18. The data
#' were rearranged and columns renamed to create matching data from each well.
#' These data represent the nitrite plus nitrate concentration in a survey in
#' eastern Iowa. The cycle 1 samples were collected during the summer of 1998,
#' and the cycle 2 samples were collected during the summer of 2007.\cr
#'
#' 
#' The description of the study unit and the cycle 1 data are described in
#' Sadorf and Linart (2000).
#' @keywords datasets
#' @examples
#' 
#' data(EasternIowaNO3)
#' # Show the change from cycle 1 to 2, ignoring censoring
#' par(mar=c(5.1, 12.1, 1.1, 1.1))
#' plot(EasternIowaNO3$C1Nitrate, seq(nrow(EasternIowaNO3)), ylab="", xlab="Nitrate",
#'  yaxt='n', xlim=c(0, 25))
#' points(EasternIowaNO3$C2Nitrate, seq(nrow(EasternIowaNO3)), col='green')
#' axis(2, at=seq(nrow(EasternIowaNO3)), labels=EasternIowaNO3$site_no, las=1)
#' 
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