Model studies investigated six designs of a rapid hydraulic structure and their influence on the river bed downstream of the structure. The results of the laboratory experiments were compared with those of the calculations based on ten scour-forecasting formulae worked out by the following authors: Veronese, Chividini, Eggenberg, Jaeger, Chian Min Wu, Mavis and Laushey, Van der Meuler and Vinje, Martins, Mason, and Yang. The best results were obtained using the Jaeger, Van der Meuler and Vinje, Eggenberg, and Mavis and Laushey formulae. The worst results were achieved with the Veronese and Mason formulae.

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