The paper presents the results of experimental investigations aimed to evaluate the efficiency of energy dissipation devices. The experiments were conducted on a weir model with a gate regulating the outflow of water, a stilling basin and a horizontal stiff bed protection downstream of the basin. The channel bed downstream of the protection had a filling of sand (d₅₀ = 1.1 mm, (d₈₄/d₁₆)^0,5 = 1.77), where the stream of flowing water formed a scour. The energy dissipators were modified during the experiments by placing baffle blocks in two arrangements in the stilling basin. To assess the effectiveness of their operation according to two criteria: (i) the reduction in the values of the basic characteristics of stream turbulence downstream of the stilling basin and (ii) the intensity of bed scouring with time and the final size of the local scour, vertical measurements of water velocity were made along the bed protection and the depths of the local scour formed during the flow were measured. It was found that baffle blocks reduced water velocity at the bed downstream of the stilling basin and had a limiting effect on the size of scour.

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