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This study investigates the temporal evolution of local scour downstream of a weir under clear-water conditions. The research hypothesis assumes that the majority of scour develops during the initial flow phase and that the rate of scour is influenced by downstream flow velocity. Laboratory experiments were conducted on a 1 : 30 physical model of a damming weir, reproducing realistic sediment and structural conditions. Results show that, on average, 85–86% of the maximum scour depth forms within the first 0.5 h, while subsequent growth slows and stabilises near the final depth. Higher flow velocities accelerate initial scour development but have little effect on later stages. The study confirms the typical clear-water scour pattern and provides quantitative insights useful for assessing structural safety and designing bed protection measures downstream of weirs.
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