ABSTRACT
ABSTRACT: Roller compacted concrete (RCC) dams have gained acceptance worldwide, particularly due to their economic advantage. Stepped spillways are easily incorporated into RCC dams due to the method of construction. In recent years, a large number of embankment dams have been considered unsafe due to inadequate spillway capacity and predicted overtopping during extreme flood events. The use of RCC stepped overlays for overtopping protection has proven to be cost effective and has gained acceptance, particularly in the USA. The present paper includes a brief overview of the worldwide application of RCC stepped spillways, namely on concrete and embankment dams. It also includes a state-of-the-art review on the hydraulic design criteria for such stepped spillways.
