The flood releasing energy dissipation facility and scouring depth of a RCC double curvature arch dam with 98m in max height and a 3 surface bay spillway is experimentally studied. The scale of the hydraulic model is 1∶60. The ski jump spillway and a new type dissipater are adopted to bring about energy dissipation by impact of low and high sill flows and impact of lateral diffusion. In addition, by increasing the falling area as large as possible and making full use of the down stream water depth, the scouring depth is reduced from the original 30 m to less than 18 m, then the problem of scouring and energy dissipation is solved. The arrangement and dissipater proposed in the model test can also provide reference for similar projects.
