FlowDurationCurve: Flow duration curve

In UKFE: UK Flood Estimation

Flow duration curve

Description

A function to plot flow duration curves for a single flow series or flow duration curves from multiple flow series.

Usage

FlowDurationCurve(
  x = NULL,
  main = "Flow duration curve",
  CompareCurves = NULL,
  LegNames = NULL,
  Cols = NULL,
  AddQs = NULL,
  ReturnData = FALSE
)

Arguments

x	a dataframe with date in the first column and numeric (flow) in the second.
main	A title for the plot. The default is Flow duration curve.
CompareCurves	A user supplied list where each element is a numeric vector (each a flow series). This is useful for when you want to compare curves from multiple flow series'.
LegNames	User supplied names for the legend. This only works when the CompareCurves argument is used. The default is Curve1, Curve2...CurveN.
Cols	User supplied vector of colours. This only works when the CompareCurves argument is used. The default is the Zissou 1 palette.
AddQs	The is to add additional flows and associated horizontal plot lines to the plot. It should be a single numeric value or a vector, for example c(25, 75, 100).
ReturnData	Logical argument with a default of FALSE. When TRUE, a dataframe is returned with the data from the plot.

Details

The user can input a dataframe of dates (or POSIXct) and flow to return a plot of the flow duration curve for annual, winter and summer. Or a list of flow series' (vectors) can be applied for a plot comparing the individual flow duration curves

Value

If a dataframe of date in the first column and flow in the second is applied with the x argument a plot of a the flow duration curves for winter, summer and annual is returned. If a list of flow series is applied with the CompareCurves argument the associated flow duration curves are all plotted together. If ReturnData is TRUE, the plotted data is also returned.

Author(s)

Anthony Hammond

Examples

# Plot a flow duration curve for the Thames at Kingston Oct 2000 - Sep 2015.
FlowDurationCurve(ThamesPQ[,c(1,3)])
#Add a couple of extra flow lines for the plot
FlowDurationCurve(ThamesPQ[,c(1,3)], AddQs = c(25,200))
#Compare flows from the rather wet 2013 water year (rows 4749 and 5114) with the rest of the flow
FlowDurationCurve(CompareCurves = list(ThamesPQ$Q[-seq(4749,5114)],
ThamesPQ$Q[4749:5114]), LegNames = c("All but 2013","water year 2013"))

UKFE documentation built on April 4, 2025, 12:55 a.m.