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Entering New Data
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1.7.2.2 Fitting Tab
The Fitting tab provides access to the Gardner method of fitting unsaturated permeability laboratory data.
Fitting the Gardner equation to data is accomplished through a nonlinear least-squares fitting algorithm. While
possible, fitting the Gardner equation to permeability data often leads to less than optimum results. The reason
for this is that the large possible range of permeability values makes fitting difficult. It is suggested that the user
pay close attention to the quality of the fit as presented by the R2 value.
1.7.2.3 Estimations Methods Tab
Laboratory measurement of the variation of permeability with soil suction is very time consuming and
expensive. It has become generally accepted practice to estimate the unsaturated permeability curve based on
the soil-water characteristic curve. SoilVision provides a host of methods for performing this estimation.
Estimation of the unsaturated permeability function using two methods may be seen in the following chapter
regarding estimating unsaturated soil properties.