My boat has a self bailing cock pit and it does just that. The same as pulling the plug and taking off it will drain as you are moving, the only difference is there is a rubber flap and curve to keep water from rushing back in when stopping or sitting still. My boat has bilge pumps as well to remove from the lower cavity but water around your feet will disappear as you drive. So for sure moving with no plug will remove water. Really no need to beach it, drive around until it is all gone and jump back in the water to put plug in you are already wet from when you removed it.