[cliffpaul2]

Yes, the water is on top of the tank because there is foam all around the edges that creates a reservoir. What I guess I'm trying to figure out, is if cutting away some the foam to create a channel for the water will do any good. Without lifting the tank I can't tell if there is a drain underneath it or not. If there is, where is it located?

I agree that I'll have to use silicone to seal up the hatch, but I'm amazed that this should have to be done to a boat that seems to be so well designed otherwise.