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Flash floods most often occur in normally dry areas that have recently received precipitation but may be seen anywhere downstream from the source of the precipitation, even many miles from the source. In areas on or near volcanoes, flash floods have also occurred after eruptions when glaciers have been melted by the intense heat. Flash flooding can also be caused by extensive rainfall released by hurricanes and other tropical storms as well as the sudden thawing effect of ice dams. Human activities can also cause flash floods to occur. When dams, constructed for hydro-electricity, have failed, large quantity of water can be released and can destroy everything within its path.