Fredlund and Wilson (1997) Estimation 
The Fredlund and Wilson dialog contains all data associated with the estimation of the SWCC proposed by Fredlund and Wilson (1997).
The Fredlund and Wilson (1997) estimation of the soilwater characteristic curve requires the input of a Packing Porosity. Typically the Packing Porosity is provided through the use of an implemented neural net. It is often useful, however, if laboratory data exists for the soilwater characteristic curve to backcalculate the Packing Porosity. SVSOILS implements a backcalculation halfdistance trial and error algorithm to calculate the optimal Packing Porosity when soilwater characteristic curve laboratory data is present.
Predicted: The Predicted Field indicates if the estimation algorithm has been successfully executed on the current data.
Error: The Error field shows the difference between the fit and laboratory values in terms of R2.
AEV: The AEV field shows the airentry value as calculated based on the estimated curve.
Max. Slope: The Max. Slope is the maximum slope (on a semilog scale) as calculated based on the estimation curve.
Click the graph button at the bottom of the dialog to display a graph.
