Whoa, I had no idea. Is it supposed to be plugged? If it isn't (and I don't know at the moment), does it mean my bilge water could be draining where it shouldn't? Actually, there usually is some water in the bilge, so it couldn't be draining.
What is happening is that because the boat is front heavy, it is difficult to drain to the bilge. Standing on the back and rocking the boat causes water to flow in, but it never really finishes draining when I'm vacumming the water. Lots of debris flows into the bilge, suggesting there is much more where that came from. When I take the boat out for the year, I will tilt it up and try to drain it. In the meantime, I'm not sure what else to do. I've fantasized about drilling a drain hole through the floor where it is lowest (in the front) and using it to suck out the water.