Performance of RCC used for overtopping protection and spillways
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Roller-compacted concrete (RCC) has become the most widely accepted method for providing safe overtopping protection for embankment dams in the United States. The concept consists of placing horizontal layers of erosion resistant RCC on the downstream slope of existing dams to increase spillway capacity during extreme rainfall events. Since the first earth dam with an RCC overlay was constructed in 1984, more than 130 such projects have been put in service. Because most of these hydraulic upgrades were designed to accommodate rare flow events, there was little information initially available of ...