BFI {lfstat}

Base Flow Index

Description

Calculates the base flow index of an object of class 'lfobj'.

Usage

BFI(lfobj, year = "any",breakdays = NULL, yearly = FALSE)

Arguments

lfobj

An object of class 'lfobj'

year

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

breakdays

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

yearly

If TRUE, the BFI is calculated for each hydrological year separately.

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 length one vector giving the base flow index for the whole series or the specified year. If yearly is true, a vector of the annual base flow indices is returned. If break days are specified, the values are separated per season.

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

bfplot

Examples

data(ngaruroro)
BFI(ngaruroro)
BFI(ngaruroro, breakdays = c("01/11","01/05"))
BFI(ngaruroro, year = 1991)
bfplot(ngaruroro, year = 1991)