Fixed breakwaters are semi-permanent structures that require construction by a knowledgeable person with an understanding of the area's wave transmission. Construction costs can be relatively high when compared to floating breakwaters. Breakwaters that are continuous can pose an ecological hazard when placed in wetlands by barring organisms from entering or leaving. Fixed breakwaters are often an eyesore--an aesthetically displeasing sight on the shoreline.
Credits:http://www.ehow.com/list_6830350_pros-cons-breakwaters.html
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