This booklet is a summary of our work in the past ten years in the study of transport phenomena in granular materials and groundwater systems carried out in the Nuclear Research Institute at Rez and Department of Nuclear Chemistry of Czech Technical University in Prague. The main goal of our work was to find simple methods of mathematical modeling, which make possible to determine each of significant transport parameters of radionuclides in order to predict their behavior in studied systems. The presented examples of the use of this method are only partially taken from our previous work in...