Note on van Genuchten Parameter "alpha"

The van Genuchten parameter "alpha" as implemented in this program is same as the one defined by van Genuchten (1980).

Here, "alpha" is the absolute value of the reciprocal of "alpha-prime" as used in the original release of VS2DH and described in the program documentations Lappala and other (1987) and Healy (1990).

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