Sentence:  The breakwater, and in particular the <WSD>roundhead</WSD>, has been the responsibility of Jersey Harbours for many years but day to day maintenance and isolated repairs were becoming more frequent, punctuated by emergency repair works to the face of the <WSD>roundhead</WSD> at the extreme end of the breakwater. 
Meaning of the word marked with <WSD> tags:  A circular platform at the end of a pier or breakwater.