CRCS spillways over embankment dams in Spain. Molino de la Hoz and Llodio Dams
When projecting and designing an embankment dam usually the cost of the spillway constructed as an independent body is high in comparison to the global cost of the dam. In some situations, special constraints forced to find innovative solutions to discharge floods maintaining the safety level of the dam. Molino de la Hoz and Llodio Dams are two examples of embankment dams with innovative solutions in this field. They were constructed in Spain in the seventies of the 20th century. These two case studies were successfully implemented and have been operating correctly for the past forty years. Both dams still work properly and have been operational for the past forty years resisting both to various floods, especially the Llodio Dam that resisted the floods of 1983.
To obtain more information about these two dams see the article Continuously-reinforced concrete slab spillways built over embankment dams in Spain: Molino de la Hoz and Llodio Dams in the book Dam Protections against Overtopping and Accidental Leakage.