group3: Calculate the group 3 IHA parameters.

In IHA: This package implements The Nature Conservancy's Indicators of Hydrologic Alteration software in R.

Description

The group 3 IHA parameters measure the timing of annual extreme water conditions. These metrics will differ from TNC metrics where the minimum or maximum occurs during a leap year after february 28th. The TNC software seems to assume that all years are leap years. So if the minium for a year is Mar 1 of a non-leap year, this code will return 60, whereas the TNC sofware returns 61.

Usage

  group3(x, year = c("water", "calendar"), mimic.tnc = F)

Arguments

mimic.tnc	should the function perform the calculation like the TNC IHA software?
x	A zoo object containing the flow series
year	the type of year factor to be used, yr = 'water' or yr = 'calendar' for water years and calendar years respectively

Value

a matrix of the group 3 parameters

Author(s)

[e-mail]

References

http://www.conservationgateway.org/Files/Pages/indicators-hydrologic-altaspx47.aspx

Examples

data(bullrun)
group3(bullrun, 'water')

IHA documentation built on May 2, 2019, 5:15 p.m.