The waters from Mała Panew river in Czarnowąsy and from Czaniec water intake in Kobiernice, together with simulations, in which bottom sediments of this waters mixed with its natural matrixes, were subjected to physicochemical analysis. In this way, the influence of rivers bottom sediments entrainment during dynamic waters flow periods on its parameters (including TOC, DOC, UV absorbance, SUVA254, alkalinity, metals concentrations: aluminium, iron and lead) was determined, which was the main purpose of this study. Subsequently, the waters were subjected to the coagulation process. The coagulant doses were determined by colloidal pollutions isoelectric point analysis. It is noteworthy that there is no influence of sediments entrainment on the necessity to change the coagulants doses. The coagualtion process was carried out with 2 types of coagulants: prehydrolyzed coagulant and conventional hydrolyzing coagulant. An increase in the organic and inorganic matters concentration after river sediments extraction was presented. However, it mostly comprised suspended matter. It has been also shown that prehydrolyzed coagulant Flokor 1.2A has a better efficiency in water coagulation process in relation to aluminium sulphate, even at much lower doses. Studies have also shown the negative influence of using aluminium sulphate on the pH and basicity of the treated waters.