svn ls https://svn.domain.com/svn/myproject/tags/
svn ls https://svn.domain.com/svn/myproject/branches/

svn del/rm

branches:

http://habrahabr.ru/post/45203/

svn cp URL->URL
svn sw ..

svn del http://svn.example.com/repos/calc/branches/my-calc-branch -m "Removing obsolete branch of calc project."