hot to fix git svn import or just discard 'branches' folder

I imported over night an svn repository with the command:

git svn clone --prefix svn/ -r 860  http://svn.some.com/svn/someproject

The svn repository uses the usual trunk, branches, tag so I (wrongly?)  
assumed I do not need to pass any command switches regarding the  
structure of the repo.

I obviously did something wrong because now I have a git repository  
with just one remote branch and it contains the folders trunk,  
branches and tag. I do not want to reimport because it is taking lots  
of time and bandwidth.

How can I fix this? I do not really need the old branches and tags, I  
want to be able to track new branches and I just want to have the  
trunk history.


Thanks for any pointers.

Marius