Wsrtjtyk

I am working on big SVN repository using git-svn. Pure svn is very slow. I should have cloned my repository using command:
git svn clone <rep_url> -T trunk/ -b branches/ --no-minimize-url css

but I did it by
git svn clone <rep_url> -T trunk/ --no-minimize-url css

or
git svn clone <rep_url> -b branches/ --no-minimize-url css

I don't know exact command I executed

Now I am facing issue because when I do git branch -a it shows me only trunk (master) branch:

* master

  remotes/origin/trunk

I want to see all branches in git branch -a output. I have another copy of this same repository and I cloned it using both switches -T and -b. When I do git branch -a in this another repository it shows me list of branches also like:

* master

  remotes/origin/trunk

  remotes/origin/branch1

  remotes/origin/branch2

  remotes/origin/branch3

  remotes/origin/branch4

  branch1

  branch2

How can I add remote branches to my repository?
Is it possible?

Note that typing git branch branch1 remotes/origin/branch1 doesn't work

Fortunately, I have fixed that. I have just compared two .git/config files (one from this repo, and second from repo with branches) and I noticed there is no branches key in [svn-remote "svn"] section, so after copying that key (branches = branches/*:refs/remotes/origin/*) and typing git svn fetch it downloaded all branches. It took for me 5 hours. But after that I can see list of all branches in git branch -a

Is modifying config file like that proper / safe solution?