A Philip's water infiltration model

Description

This is a two- parameter function to determine water infiltration parameters contained in the Philip's infiltration model

Usage

1
SSphilip(input, fc, S)

Arguments

input

Time

fc

Steady infiltration rate

S

Sorptivity

Details

This is a self-starting model for estimating Philip's infiltration model using instantaneous infiltration rates (here known as Rate) and time (Time) data

Value

A list of objects returned by standard R regression functions such as nls and lm

Author(s)

Christian Thine Omuto

References

Philip JR. 1957. The theory of infiltration.: 4 Sorptivity and algebraic infiltration equations. Soil Science 84: 257-264

See Also

SShorton, SSgampt

Examples

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data(infilt)
philip.nis=nlsList(log(Rate)~SSphilip(Time,fc,S)|PlotNo, data=infilt)
coef(philip.nis)