Wash is the inevitable consequence of a vessel moving on the surface of a river, canal, lake or the sea. In this paper the principal features of wash are considered, as are the factors causing them. Some consideration is then given to the reduction of wash nuisance by design and operation after which the paper concludes with a brief excursion into wash criteria. The main conclusion reached is that, while wash of surface vessels cannot be eliminated entirely, its nuisance to other waterway users can be reduced to acceptable levels by suitable design and operational measures.
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