The most essential results of processing and analyses of regular and field study data for the hydrophysical and hydrochemical characteristics of the Provadiyska river, the “Padina” canal flowing into it, the Devnenska river, the settling basin and the western part of the Beloslav lake, carried out by a group of scientists from UACEG at the end of 1994 are presented. Based on the available data from the National Institute of Meteorology and Hydrology, the general hydrological characteristics of the Provadiyska and Devnenska rivers are determined. The ratio between natural sediments and industrial/chemical ones entering into the settling basin and Canal 2 is estimated. Physical and chemical parameters as well as the quantities of the bottom sediments in the settling basin and in the Beloslav lake are determined.