There are many configurations for svn, here a some short instuctions to get a basic svn repository available over http.

1. Install required packages:

   apt-get install subversion apache2 libapache2-svn

2. Create an Directory-Structure:

   mkdir -p /var/svn/repos/
   

3. Create a Repository:

   cd /var/svn/repos/
   svnadmin create --fs-type fsfs <your-repository>
   

4. Now Create your Project-Struckture to import in the repository:

   mkdir -p /tmp/myproject/trunk /tmp/myproject/tags /tmp/myproject/branches
   

5. Import the Project to the Repository:

   svn import /tmp/myproject file:///var/svn/repos/<your-repository> -m "initial import"
   

6. Make it accesseable over http:

   cd /etc/apache2/sites-available
   touch subversion.conf
   vim subversion.conf
   

7. Now edit the empty file with this configuration:

   NameVirtualHost *:80
   
   <VirtualHost *:80>   
     <Location /svn>
         ErrorDocument 404 default
         DAV svn
         SVNParentPath /var/svn/repos
         SVNListParentPath off
         Require valid-user
         AuthType Basic
         AuthName "subversion access"
         AuthUserFile /var/svn/.htpasswd
         AuthzSVNAccessFile /var/svn/authz 
     </Location>
   </VirtualHost>
   

8. enable dav_svn module for apache:

   a2enmod dav_svn
   enable VHost configuration: 
   a2ensite subversion.conf
   

9. now restart the webserver:

   /etc/init.d/apache2 restart
   

10. Create an htpasswd:

    htpasswd -c /var/svn/.htpasswd user
    

11. Create the access control file for the repository:

    touch /var/svn/authz
    

12. edit the empty authz file:

    vim /var/svn/authz
    

13. Give read/write rights to for user:

    [your-repository:/]
    user = rw
    Let's try to checkout the the repo over http: 
    svn checkout http://your-server/svn/your-repository