#' Monthly and Annual; Total and Intervening Natural Flow
#'
#' A data set containing the monthly and annual; total and intervening natural
#' flow at 29 locations in the Colorado River Basin beginning in October 1905.
#' The data go through December of the last year of computed natural flows.
#' Typically, natural flows are released on a two year delay, i.e., natural
#' flow through 2018 is released in 2020.
#'
#' Natural flow represents the flow that would have occurred at a location, had
#' depletions and reservoir regulation not been present upstream of that
#' location. The total natural flow represents the total flow in the entire
#' basin above a given gage. The intervening natural flow represents only the
#' flow that originates upstream of a given gage, but below all upstream gage
#' locations.
#'
#' The natural flows are recomputed annually and are subject to change without
#' notice. All methods are fully desribed at
#' <http://www.usbr.gov/lc/region/g4000/NaturalFlow/current.html>.
#'
#' Each of the 29 locations are represented by one variable (column). The
#' variable names use a shorthand name of each gage location, e.g.,
#' `"LeesFerry"` is shorthand for the "Colorado River at Lees Ferry, AZ". See
#' the "CoRivNatFlow" vignette for a list of the full gage names and their
#' respective shorthand versions.
#'
#' The monthly data will sum to equal the annual data for each location as
#' follows:
#'
#' * Summing `monthlyTot` each year from January through December
#' will equal `cyAnnTot`
#' * Summing `monthlyInt` each year from January through December
#' will equal `cyAnnInt`
#' * Summing `monthlyTot` each water year from October through
#' September of the following year will equal `wyAnnTot`
#' * Summing `monthlyInt` each water year from October through
#' September of the following year will equal `wyAnnInt`
#'
#' The data include xts attributes (ex: `xtsAttributes(monthlyTot)`) for the
#' source, the source workbook, and the sheet name the data were created from.
#'
#' @format An xts matrix with 29 columns (locations). Annual data include
#' n-years rows, where n-years are the number of years in the natural flow
#' record. Monthly data include (n-years * 12) + 3 rows. All values are in
#' acre-feet. For annual data, each value is associated with December of the
#' year for calendar year data and September of the year for water year data.
#'
#' @source <http://www.usbr.gov/lc/region/g4000/NaturalFlow/current.html>
'monthlyTot'
#' @rdname monthlyTot
'monthlyInt'
#' @rdname monthlyTot
'cyAnnTot'
#' @rdname monthlyTot
'cyAnnInt'
#' @rdname monthlyTot
'wyAnnTot'
#' @rdname monthlyTot
'wyAnnInt'
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