What water in the BC does is decrease the available lift of the BC by the weight of the water in it. That is, a BC with 22 pounds of lift that has a quart (about two pounds) of water in it will have the potential of only 20 pounds lift, because the two pounds of water inside the BC displaces (surprise!) two pounds of water outside the BC.Charlie99:Water in a BCD doesn't affect buoyancy one way or the other.
So, in addition to being sloppy, poor technique, a whole bunch of water in your BC isn't a good idea.
Rick