Implications of the Seismic Coefficients in High Dams Constructed in Mexico

High rockfill dams with impervious core or concrete face located in areas of high seismicity in Mexico, require rigorous analysis of seismic stability, which have to observe the standards for dams design. The analyses are clearly dependent on the seismic coefficient for maximum credible and operation earthquakes, which could be deeply increased in order to have a safety factor. Consequently, these coefficients involve the necessity of more conservative geometries for dams, highest quality materials and strict compaction processes, which directly affects the cost and performance during construction. For these reasons the local rules suggest a particular risk study for each dam. In order to have coefficients that may be more realistic, achieving a better cost-benefit-time ratio. This paper describes the study of some existing curtains in Mexico, with seismic coefficients in accordance with those considered during the design and construction stages and using the results of the studies conducted for each site available in the code by the Mexican Electricity Federal Commission. Finally, the implications and consequences related with the constructive activities for each of the analyzed cases are commented, as well as some lessons learned and suggestions for future analyses in order to contribute for sustainable projects.