Permeability proprieties of soils play fundamental role in design calculation of earth structure. Geotechnical parameter which describe these proprieties is permeability coefficient. The paper contains an analysis of testing procedure for determination of permeability coefficient in a horizontal direction in cohesive soils from BAT probe. In this paper the results of in situ coefficient k_hBAT in the havily overconsolidated clays Warsaw region have been presented. In the elaborated empirical formulae the coefficient was determined on the basis of calibration BAT probe and laboratory test results obtained from constant flow rate permeability tests (Flow Pump technique). Comparision of field and laboratory tests results gives the possibility to elaborate method for in situ measurement of coefficient k_hBAT by BAT probe. Analysis of factors influence on correct estimation flow water parameters in pliocene clays shown the variation of k_h coefficients at depth in the subsoil geological profile in Warsaw.

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