The aim of this work was examination of Equi-pF device for determination of retention and hydraulic parameters of clay soils using inverse method. The measurements were performed in Porous Media Physics laboratory, Water Center WULS in Warsaw using Equi-pF device. Heavy clay soil samples were collected from Lidzbark Warmiński experimental site. For determination of retention and hydraulic properties inverse method included in HYDRUS-1D model was applied. Performed research shows that measured by Equi-pF device data concerning water outflow from soil sample as a function of time can be use as a input parameters for HYDRUS-1D model, which enables evaluation of soil water retention and hydraulic properties by inverse method.

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