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This thesis deals with hydromorphological survey using the HEM methodology (Langhammer, Hartvich 2014) and its application to the backbone streams of the Bouřlivec catchment. The aim is to determine the extent of anthropogenic modifications on these streams and their subsequent classification according to the corresponding classes of hydromorphological quality. In summary, 28,107 km of watercourses were mapped by field monitoring, which were divided into 101 morphologically unique sections. Each section was assigned a hydromorphological quality class according to the calculated hydromorphological status. In only 4,28 % of these sections, a state close to nature was stated. The remaining 95,72 % of sections show signs of anthropogenic modifications, which are evident especially in sections intersecting urban areas of towns and municipalities. The highest rate of anthropogenic modifications was identified in a total of 1,02 % of sections, which were assigned the worst class of hydromorphological quality. The sections that can be assessed as significantly modified make up to 18,24 % of the mapped area and the moderately modified sections cover 29,57 % of the area of interest. The final comparison of the two investigated streams clearly shows that the Loučenský brook significantly exceeds Bouřlivec,...