*Civil Engineering, Regional Institute of Technology, Jamshedpnr.
**Civil Engineering, Regional Engineering College, Bhopal.
Various types of energy dissipating blocks are adopted in stilling basins of high velocity flows in order to obtain a greater dissipation of energy than that obtained in an ordinary hydraulic jump formation. The present paper reports the experimental investigation carried out in a 3 ft. (0.9 m.) wide masonry flume with five types of energy dissipators. The criteria for efficiency was the per cent energy dissipated and the magnitude of scour in a sand tray located in the downstream of the stilling basin. It was felt that the rectangular blocks were the most efficient and suitable as dissipators. Some experiments were carried out with two rows of blocks which showed more energy dissipation than a single row.
An attempt was also made to measure the pressure drag offered by a cube element under submerged conditions. A plot of drag coefficient against the Froude number of flow has also been presented.
