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The reservoir complex in Zesławice on the Dłubnia River belongs to the Cracow agglomeration. It is located near built-up areas, which reduces the available flood reserve capacity and at the same time protects these areas. The experience of the flood in 2010 confirmed that this level is not sufficient, though. The main objective of this study is to evaluate the flood protection effectiveness of the Zesławice reservoir complex by estimating the maximum flood level, which can be effectively reduced. Numerical calculations were performed on a 1-D computer model of the Dłubnia River with the MIKE 11 software (by DHI). Due to the complexity of topographical arrangement of the Zesławice reservoirs, each one was modeled as a separate 1-D object. The hydraulic connections between them were defined and the rules controlling the outflow were modeled. In addition, the evaluation of the Dłubnia riverbed capacity downstream of Zesławice was performed and a general guidelines how to increase the level of flood prevention in the impact area of the reservoirs were formulated.
This paper presents the results from a laboratory research project about water flow through and around coniferous and deciduous shrubs. These are the only two types of shrubs that were considered in this research project. The shrub obstruction consisted of natural branches fixed in the bed of the flume, transversly to the direction of the flow. Besides hydrodynamic parameters, shrub density, water swelling over them, and local drag coefficients of the shrubs was measured and calculated. The final measurement was influenced by the density of both shrub types mentioned above and the spatial orientation of their branches in specified shrub zones in the path of the flowing water. These were analyzed both quantitatively and qualitatively and the appropriate computational formulae were proposed.
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The research involved Słup Dam Reservoir, which is used as a source of drinking water and for flood prevention. The research material was made up of aquatic plants and water collected in the littoral zone of the reservoir, in which copper, nickel, cadmium, lead and zinc contents were determined. Ceratophyllum demersum L. turned out to be the best accumulator of nickel, cadmium and zinc, Potamogeton crispus L. – copper, and Phragmites communis Trin – zinc. The presence of plants in the backwater area of the dam reservoir definitely improves water quality, not only thanks to their metal accumulation properties but because of their ability to act as a filter of substances carried in the water.
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