Design of Ski-Jump bucket provided at the end of a straight prismatic chute of an orifice spillway involves the bucket shape, take off geometry, trajectory geometry, training walls and dissipation of excessive energy. The role of Hydraulic model studies is crucial in finalizing the design of spillway and energy dissipator of a dam spillway. Hydraulic model studies conducted at Central Water & Power Research Station, Pune, India, played an important role in finalizing the design of spillway and energy dissipator for Dhauliganga dam, Uttarakhand. Various alternatives were studied on a 3D comprehensive model for optimizing the design of spillway and energy dissipator. Studies were also conducted for providing various alternative devices such as wedge, deflector wall of various designs as an extension to the right training wall to divert the flow to the river channel and recommendations were made based on the observations of the model studies. This paper describes the detailed hydraulic model studies for evolving efficient design of spillway and energy dissipator for the project.
Dhauliganga Dam Spillway, Chute, Ski-jump bucket, lip-angle, throw distance, Deflector wall
