A Study of Articulated Concrete Blocks Designed to Protect Embankment Dams

In recent years articulated concrete blocks (ACB's) have provided innovative and cost effective solutions for embankment dam protection. Many older, outdated dams are being rehabilitated to meet higher regulatory standards and/ or to accommodate current estimates of the probable maximum flood. A cost-effective method of upgrading many of these dams is to allow overtopping and to protect the downstream face of the dam using revegetated concrete blocks designed for hydraulic stability. This armoring of the embankment protects against erosion caused by steep-gradient, high velocity flow. This article will present several case studies where articulated concrete block systems are being used to prevent erosion of the downstream face of a dam during overtopping flow. Finally, recommendations on the design and construction of embankment dam protection using articulated concrete blocks will also be provided.