The macropore parameters are used for the full macropore flow in the unsaturated zone.
Porosity - is the macropore porosity.
Saturated conductivity - is the saturated conductivity of the macropores.
Conductivity exponent - is the exponent, n, in Equation (28.35), which represents the simple power function assumed for the conductivity-water content relationship.
Psi threshold - is the capillary pressure in the matrix above which flow in the macropores can occur. Pressures below this value would result in water being absorbed into the matrix via capillarity.
Beta - is the mass transfer rate between the macropores and the matrix.
