I have been getting quite a bit of water into the bottom of my boat (5-6 inches) soon after I either first put the boat in the water or after I bilge it out on the lake. I am a new boat owner and was wondering how much water intake is normal if any? Also if not how can I go about fixing it. The plug is secure and there is no air bubbles surrounding it, so I have no reason to believe that it is entering via the drain plug. Where else should I look for intake and how? Suggestion or tips would be greatly appreciated.

Thanks,
Joe