Vadose Zone J. 6:116–123 (February 2007)

There was an error in Eq. [6], the mixed form of the Richards equation, which appeared originally as follows: 
\[\frac{{\partial}{\theta}}{{\partial}t}\ =\ \frac{{\partial}}{{\partial}x}\left(K\frac{{\partial}h}{{\partial}x}\right)\ +\ \frac{{\partial}}{{\partial}z}\left(K\frac{{\partial}h}{{\partial}x}\ +\ 1\right)\]
6
...
The correct equation is: 
\[\frac{{\partial}{\theta}}{{\partial}t}\ =\ \frac{{\partial}}{{\partial}x}\left(K\frac{{\partial}h}{{\partial}x}\right)\ +\ \frac{{\partial}}{{\partial}z}\left(K\frac{{\partial}h}{{\partial}z}\ +\ 1\right)\]
6
...

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