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Fig. 12. Soil hydraulic van Genuchten functions fitted to the soil water retention curve measured at equilibrium (static) and obtained by fitting the numerical solution of Richards' equation to water flow measurements performed on homogeneous soil materials (infiltration and drainage), and obtained by fitting the dual-permeability model to flow measurements conducted with heterogeneous soil systems consisting of loam (matrix) and medium or coarse sand (preferential flow path, PFP): medium sand (a) water content and (b) hydraulic conductivity, coarse sand (c) water content and (d) hydraulic conductivity, and loam (matrix) (e) water content and (f) hydraulic conductivity.
