Single runways/low vis ops seems to have been very poorly thought out at MAN. It says in the briefing document that came round before the runway opened that during low vis the airport will revert to single runway ops. Fair enough I suppose for the moment but will need to be sorted for the future. It goes on to say that due to interaction of new SID's and STAR's that the capacity of the single runway (24R/06L) will be less than it was before so expect delays. This is quite pathetic. How can you spend hundreds of millions on a new runway and end up with less capacity in low vis. than you had before. It is one of the most ridiculous things I have ever heard.