fdc {lfstat}

Flow Duration Curve

Description

Plots the flow duration curve for a given low flow object.

Usage

fdc(lfobj, year = "any", breakdays = NULL, colors = TRUE,
    xnorm = FALSE, ylog = TRUE, legend = TRUE, separate = FALSE,
    ...)

Arguments

lfobj

An object of class "lfobj"

year

numeric - The year for which the flow duration curve should be computed. If hyearstart != 1 the BFI is calculated for the hydrological year, any = "any" means the whole series should be taken.

breakdays

A vector of break days if the BFI should be calculated for different seasons.

colors

logical - If 'breakdays' are specified, should the different flow duration curves are displayed in different colours?

xnorm

logical - should the x-axis be normalized?

ylog

logical - The the logarithm of the y-axis?

legend

logical - Should a legend be plotted?

separate

logical - Should a separate plot be drawn for every season?

...

Graphical parameters handed to plot

Details

If breakdays is a single day, e.g. "01/06", the start of the hydrological year is taken as the second break day. If more than two seasons are to be specified, a vector of all break days is needed.

Value

A vector of quantiles.

Author(s)

Daniel Koffler and Gregor Laaha

References

Gustard, A. & Demuth, S. (2009) (Eds) Manual on Low-flow Estimation and Prediction. Operational Hydrology Report No. 50, WNO-No. 1029, 136p.

See Also

ecdf

Examples

data(ngaruroro)
fdc(ngaruroro,year = 1991)