Plans have been lodged to construct a new wall immediately in front of the existing wall to halt further deterioration.
Charles Laird, consulting engineer at Buchanan Laird, said: "At this time it is impossible to assess how much longer the wall will remain intact. The current stability of the upper section of the wall is uncertain and it is anticipated that any deterioration in the condition of the wall may be sudden if no remedial measures are undertaken."
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Hide AdCouncillors are due to make a decision on the proposal in June.