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