I intend to wall off the laundry area of my basement, but the only floor drain is in this area. Does it make sense to leave a little gap under the wall (shimmed up a half inch or so), so that if I ever flood in the other part of the basement, it can flow unfettered under the wall and to the drain, rather than damming up behind it?

Mind you, flooding risk is quite low, but was just thinking of the worst case scenario. Maybe this is a bit paranoid/unneccesary. Thoughts?