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The uncertainty of the water flow velocity data obtained in the laboratory test The uncertainty of the water flow velocity data obtained in the laboratory test.  Some of the engineering constructions are significant for the environment and flood protection. There are dams for water retention as well as waste tailings dams and road embankments founded on organic soils. Constructions on soft organic soils make it necessary to calculate subsoil deformations with a special regard of the water flow. In this thesis, the approach of the water flow test in soft organic soils is presented. In the permeability test the modern flow-pump technique was applied. This technique takes into consideration organic fiber structure, large soil strain, short time of research and "real" hydraulic gradients appearing in situ. The specific behavior of soft subsoil demands to calculate the test reliability results. Therefore in the statistical analysis of the test results the suitable statistical method and the proper laboratory technique should be used. Several statistical models have been applied to the flow pump test results in order to find the correct description of water flow velocity in soft subsoil.