Encyclopedia
Blockage
Ice jam - blockage of a river's live cross-section during autumn ice breakup and at the beginning of ice formation caused by a mass of water ice and slush (hinders water movement, causes water level rise and flooding of the shore)
Source: "RD 51-2-95. Regulation on implementation of environmental requirements for placement, design, construction and operation of underwater crossings of main gas pipelines"
(approved by Order of OJSC "Gazprom" dated August 8, 1995)