The thesis uses the simplified methods for calculating the dam-break wave parameters for selected dams, for which the dam-break wave calculations with the full Saint-Venant equations also exist. First, the methods and the results of the dam-break wave calculations with the full Saint-Venant equations for selected dams are briefly presented. They will serve as a basis for further comparison. Then, the
simplified method for calculating the dam-break waves is presented. This method contains dimensionless coefficients and two nomograms for determining three values. These values are the maximum flow at the dam, the time, and the distance, when the flow of the dam-break wave is reduced to half the value by reference to the value of the maximum flow at the dam at the time of the dam break. The methods and the problem of determining the input data needed for the calculation are described, followed by the calculation itself. The calculations of the dam-break wave parameters can be found in the main part of the thesis. The results derived from the simplified methods were compared to the results derived from the full Saint-Venant equations. The analysis of the deviations between the methods served as a basis for evaluating the accuracy of the simplified methods and their usefulness in the dam-break wave calculation in the hydraulic engineering practice.