Van Genuchten capillary pressure and its saturation inversion.
2 functions
PO.SCAL.VanGenuchten.Pc
Van Genuchten capillary pressure, [psi]. Se = [1 + (αPc)^n]^(-m).
PO.SCAL.VanGenuchten.Sw
Van Genuchten saturation from capillary pressure, {1}. Inverse of Pc function.
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