The doctoral thesis is dedicated to analyze two-phase liquids hydrogeological parameters’ determining methods and importance of these methods in contemporary applied geology. Also the doctoral thesis describes the applicability of studied methods for the different kind of hydrogeological solutions, as well as to investigate the development trends of those methods and their potential usage in the future. The study proves that after suspension of pumping process from the well, during the period of level recovery based on the regular free-phase liquid layer thickness and its interface with water measurements in the pumping well, it is possible to obtain the data necessary for determining the actual thickness of free phase liquid layer in the aquifer. Systematic analysis of theoretical data of two-phase liquid flow in the shallow aquifer has been carried out and verified with the results of field experiments. The parameters obtained experimentally in the field have tight correlation with the empirically-estimated indicators that point to the interchangeability of these methods for applied and scientific research.