Numerical modelling has become indispensable for the design, operation and safety assessment of dams. The high technology of numerical modeling, however, consists not only in the explosive increase of the computer hardware and software capabilities in the last decades. It is in the whole highly sophisticated process from the computational model development to its real nature implementation. The Benchmark Workshops organized by the ICOLD Committee “Computational Aspects of Analysis and Design of Dams” since 1991 provide a unique opportunity for engineers and researchers to present and exchange their knowledge and experience in this cutting-edge technology related to the design and performance of dams.