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The Water Framework Directive obliges the member states of the European Union to monitor the state and ecological potential of water bodies. The assessment is based on physicochemical indicators, biological elements and hydromorphological conditions. As part of the hydromorphological conditions assessment, the following is taken into account: spatial layout of the watercourse, water depth, bottom substrate, as well as the presence, spatial and species structure of aquatic and riparian plant communities. Considerin...