Evaluation of Energy Dissipation over Dentate Blocks Spillway and Comparing the Energy Dissipation with Stepped Spillway

Many investigations have been performed in order to increase the efficiency of energy dissipation over the spillways. In this study, the chute was roughened by means of the dentate blocks that were made of Teflon with new geometric shape and configurations. The experiments were carried out at three slopes, under six discharges and five dentate blocks configurations. Based on the laboratory results, it was concluded that the roughness geometry influences the relative energy loss. It was also found that using mix arrangements and selecting different sizes among roughness elements can increase the value of relative energy loss. Finally, it was observed that the dentate blocks spillway caused an extra 21% reduction in energy dissipation compared to the stepped spillway which is widely utilized to dissipate the energy.