ASSESSMENT OF FLOOD PREVENTION EFFICIENCY OF THE RESERVOIR COMPLEX IN ZESŁAWICE ON THE DŁUBNIA RIVER

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.