Fig. 6. Soil water retention, hydraulic conductivity, and predicted hydraulic conductivity by the Campbell (1974) model with b = b₂, the van Genuchten (1980) model using (K_S, _S), the Van Genuchten (1980) model using (K_S = K₂, _S = ₂), and the TRC model. Data for two undisturbed, non-structured soils from UNSODA.