In the article a sensitivity analysis of linear and nonlinear terms in the Kozeny-Carman and
Ergun equations was shown. In the first case the impact of the porosity, tortuosity, specific surface of
the porous body and the model constant was investigated. In the second case the porosity, the particle
diameter and the sphericity function were taken into account. To express the model sensitivity by
numbers, an earlier developed method was used. In this way the order and the importance of the
impact of individual parameters was determined. The motivations to create this article were
questions, which occurred during developing a novel investigation method, linking the Discrete
Element Method and the CFD techniques. The first aim was to predict what will happen, if individual
parameters will be set with an error: which data should be set as accurately as possible and which
data are not very important for the result value. The second intention was to state which of
parameters used in porous media investigations should be expressed by functions and which by
constant values. The article may be treated as set of pointers helping in using of Kozeny-Carman and
Ergun laws or as an example of research methodology based on the sensitivity analysis.
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