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Fig. 2. Relationship between volumetric water content and matric potential in each of the five sand layers of the column as predicted by the van Genuchten (1980) water retention model: (A) water retention curves for the sand sizes used, and (B) thickness of each layer. The quasi-static equilibrium after drainage provides a volumetric water content between 0.15 and 0.32 in each layer.
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