When you look at the pinch welds under the rocker panels, there's some slight indentations where the jack is meant to be placed near each wheel. They somewhat line up underneath the door gaps. The drains are actually part of the pinch welds in those areas, and are basically wide spots. They are often crushed, bent, or filled in with gunk. You can try to clear them out, but with so much water that its sloshing, I'd just get a drill bit and open them up a little more.