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The advantages are that they are strong and provide good protection by absorbing the waves energy. The disadvantages are that they have a relatively short life span (30-50 years) and are quite expensive.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoThe advantages are that the river will not over flow because there is a barrier around the river and the disadvantages are that, i dunno it just makes the place look really bad i guess.
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