This Bachelor's thesis deals with the small water reservoir Ostrov nad Oslavou and its assessment with regard to the passage of the flood wave. Drawing takes place according to the requirements TNV 75 2935 (technical standard). In the first chapters we gradually describe the purpose of the water structure. In the following chapters we summarize the basic data, documents and values, including description of hydraulic calculations. Followed by analyzing of the maximum permissible safe water level and then setting of the maximum check flood water level in the reservoir as a result of transformation of the flood wave. In the final chapter there is a comparison of those two levels, their evaluation and recommendations. These measures are designe...