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The problem of withdrawing sediment at canal diversions is old and still largely unsolved.In the west, it has been recently given the name "Bulle effect", for the name of the Austrian researcher who made the first experiments on the subject in the west, (Schoklistsh, 1973) although apparently its results and some of the ways to solve them were known in China more than 2200 years ago, (Appleton, 1984).