ABSTRACT
After the construction and commissioning into service of a dam, in most cases, one can say that the hydraulic scheme has been completed. What remains is for the user intensively and carefully to follow its work and to maintain it in a proper and correct condition in the course of its service life. With a certain number of hydraulic schemes, sooner or later after completion, there comes a need for performing restoration and reconstruction of the dam, and/or of its individual appurtenant structures and elements. The need for restoration appears owing to three reasons:
• Incorrect or inadequate technical solutions in the design that have led to irregular and improper work of the dam and/or the appurtenant structures;
• Damage to the dam and/or appurtenant structures due to influences that could not be anticipated, that is to say, there had been a very low probability of their occurrence;
• Ageing of the structures and artificial materials of which they have been made, originating as a result of external influences and long-lasting service conditions.
