D. RASSAM, J. SIMUNEK, and M.TH. VAN GENUCHTEN. ND Consult, Brisbane, Australia. 2003. Paperback plus CD-ROM. $80.00. ISBN 0-646-42309-6.

The highly nonlinear character of flow through partially saturated porous media has created great obstacles to development of accurate and accessible solutions to practical problems. This in large part explains the continued popularity of the rather drastic and obsolete approximations, such as those of Green and Ampt. Being personally familiar with the generic aspects responsible for the lack of stable codes to solve unsaturated flow problems and having studied macropore and fingered flow, I was skeptical of HYDRUS-2D when I met...

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