van Genuchten (1980) Fit 
The van Genuchten dialog contains the equation parameters necessary to mathematically represent the SWCC curve with the equation published by van Genuchten (1980). A description of the theory can found in the SVSOILS Theory Manual.
avg (a): The avg field refers to a fitting parameter in the van Genuchten (1980) equation. The avg parameter is indirectly related to the airentry value of the soil.
nvg: The nvg field refers to another fitting parameter in the van Genuchten (1980) equation. The nvg parameter is related to the steepness of the SWCC.
mvg: The mvg field refers to another fitting parameter in the van Genuchten (1980) equation. The mvg parameter is primarily related to the curvature at the breaks along the SWCC.
Fit: The Fit indicates whether the experimental data has been fit with van Genuchten (1980) equation.
Error: The Error field shows the difference between the fitted data and the laboratory values in terms of R2.
Residual WC, wr: The Residual WC refers to the calculated residual gravimetric water content from the van Genuchten (1980) equation.
AEV: The AEV is the airentry value calculated using the van Genuchten (1980) fit of the soilwater characteristic curve (kPa)
Max. Slope: The Max. Slope refers to the maximum slope (on a semilog plot) of the van Genuchten fit (1980) along the soilwater characteristic curve (unitless).
Click the graph button at the bottom of the dialog to display a graph.
