Studies of Design of Hydraulic Jump Type Stilling Basin in Laboratory for Gunjawani Dam, Maharashtra, India

ABSTRACT The water flowing over the spillway acquires a lot of kinetic energy by the time it reaches near the toe of the spillway. If precautionary measures are not made to dissipate this huge kinetic energy of water, large scale scour can take place on down-stream side near the toe of dam and away from it. The kinetic energy of this supercritical flow can be dissipated by converting supercritical flow into subcritical flow by creating hydraulic jump. The phenomenon of hydraulic jump occurs, by providing stilling basin, end weir. Hydraulic jump type energy dissipaters are widely accepted techniques of energy dissipation while designing the hydraulic structures like dams, weirs and barrages. They are popular for their simplicity and efficiency, but have certain limitations when variations occurs in discharge conditions. The energy dissipaters satisfactorily function at design discharge condition. But in case of varying discharges they are not efficient as the location of hydraulic jump tends to shift on apron. This would result in percentage reduction in energy dissipation. Therefore it is necessary to address the issue of controlling the location of hydraulic jump and evolve a technique for the same. Local scour downstream of hydraulic structures due to hydraulic jump is considered one of the tedious and complicated problems facing their stability. This paper discusses the design of hydraulic jump type stilling basin for the overflow Spillway at Gunjwani dam. A model study is carried out by applying Froude’s model. Keywords: Hydraulic jump, Stilling basin, Scour, Tail water, Weir etc. Cite this Article Gavhane AT, Sathe NJ, Hinge GA et al. Studies of Design of Hydraulic Jump Type Stilling Basin in Laboratory for Gunjawani Dam, Maharashtra, India. Journal of Water Resource Engineering and Management. 2017; 4(3): 15–22p.