Encyclopedia
Rolling
A bar - a typical feature of the riverbed topography in lowland rivers, formed by sediment deposits, usually appearing as a wide ridge crossing the channel at an angle to the general direction of flow, causing deviation of the current from one bank to another
Source: "GOST 26775-97. Dimensions of navigable bridge spans for inland waterway bridges. Norms and technical requirements"
(introduced into force by the Decree of Gosstroy Russia dated July 29, 1997 No. 18-42)