Ice Dam

An ice dam (or ice jam) occurs when water builds up behind a blockage of ice. Ice dams can occur in various ways which include a glacier blocking an unfrozen river and a thawing river being blocked by a still-frozen section further on. On a small scale the term can be used for ice blockages of gutters and spouts on buildings.

Read more about Ice Dam:  Caused By A Glacier, On Rivers, On Roofs of Buildings

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