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Backwater - an increase in water level caused by obstruction or constriction of a river channel or changes in groundwater flow conditions
(Source: "GOST 26775-97. Underbridge Clearances for Navigable Spans of Bridges on Inland Waterways. Norms and Technical Requirements")
(introduced into force by the Decree of the Russian Ministry of Construction dated July 29, 1997 No. 18-42)