Water transport and the fate of solutes in the vadose zone are among the important processes soil scientists have been trying to quantify for a long time to address emerging environmental problems. When investigating these processes with conceptual or deterministic models, we have to provide information about the hydraulic properties of the vadose zone under investigation. One approach to obtain this information is the sampling of undisturbed vadose zone cores that are subsequently analyzed in the laboratory. Unfortunately, it has been a major challenge to integrate these small-scale measurements of the soil hydraulic properties into hydrologic models that apply Soil Sci. Soc. Am. J. 72:305-319 doi:10.2136/sssaj2007.017
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