Read the following lines to answer this question The livid waters roared and snarled and flapped At the poor battered and weeping yacht. The dominant device...

The dominant device used in the lines is personification. Personification is a figure of speech in which non-human objects are given human qualities. In the lines, the water is described as "livid," and it is personified as it "roared and snarled and flapped" at the yacht. This is a human quality given to the water, making it a personification.