van Genuchten (1980) and Mualem Fit (1976) 
The van GenuchtenMualem dialog contains the equation parameters necessary to mathematically represent the SWCC equation published by van Genuchten (1980) and Mualem (1976). A description of the theory can found in the SVSOILS Theory Manual.
am(a): The am field refers to a fitting parameter in Mualem (1976) equation. The am parameter is indirectly related to the airentry value of the soil.
nm: The nm field refers to another fitting parameter in Mualem (1976) equation. The nm parameter is related to the steepness of the SWCC.
Fit: The Fit indicates whether the experimental data has been fit with the Mualem (1976) equation.
Error: The Error field shows the difference between the fit and laboratory values in terms of R2.
Residual WC, wr: The Residual WC field refers to the calculated residual gravimetric water content from the Mualem (1976) equation.
AEV: The AEV field shows the airentry value calculated from the Mualem (1976) fit of the soilwater characteristic curve (kPa).
Max. Slope: The Max. Slope refers to the maximum slope (on a semilog plot) of the Mualem (1976) fit of the soilwater characteristic curve (unitless).
Click the graph button at the bottom of the dialog to display a graph.
