Launching 20 new URLs to branch out from a multi brand website. How do I make sure the rankings stay?

[Empower_MediaMarketing]

I have a client with a multiple brand website currently. The site has landing pages and directories for each of its 20 brands under one URL. The plan is to build 20 separate brand websites with new domains and have the old content redirect to its corresponding new URL. The problem that I envision is being able to successfully carry all of the existing indexed content over while only using 301 redirects and submitting the new domains to Webmaster tools. Has anyone done this in the past successfully and do you have any recommendations?

[EGOL]

So, you are going to blow all of your domain authority by dividing it into twenty pieces?

If you are doing this to get keywords in your domain or manufacture links from one site to another then this is a very bad idea.

I would be grinning if one of my competitors was doing this.

[Empower_MediaMarketing]

Thanks for your reply. Unfortunately this decision was made before my involvement.