[NoBones]

I don't know, maybe drain plug not in?? Heavy rain ??
Where do you keep the boat?? On a trailer?? In the water??
Do you have a bilge pump??
Do you live in the US?? Are you on a Lake?? Are you on a river?? What year is the hull?? What model??
Maybe alittle more info might be helpfull.

See ya, Ken