Water from reservoir can leak through the RCC mass, through the foundation rock, or through the interface between them. Although the permeability of RCC mass is typically similar to that of common concrete, RCC is a layered structure where the horizontal joints may become the preferred seepage channel and the construction process may have an important influence in the final homogeneity and permeability of the RCC mass. A waterproofing barrier at the upstream face of the dam has proved to be the most effective
