With the design of the vent not much water gets in unless the water hits it sideways. Washing the boat probably introduces the most water. The water that does get in will land in a type of plywood half box (as to prevent the water from getting into the engine room itself but air still gets into the ER) then drain out through a fitting in the one corner. The drain hose goes through the engine room and back to a small fitting on each side of the cockpit and drains onto the lower floor which because of the slant is supposed to travel to the outer sides of the cockpit then aft to the scuppers. Not a good design if you have carpet. Mould and mildew is an issue as a result. The problem I found with mine was the drain in that "half box". It wasn't at the lowest point so water just sat in the other corner and eventually worked its way through the wooden joints and dripped into the engine room. My solution was to remove the outer and inner vent cover and use that black spray seal that you see on TV. You know, the commercial where they use a screen door on the bottom of a boat, seal it, then take the boat out to a pond and it doesn't sink! I just sprayed all over the corner where water accumulated (really couldn't see and spray at the same time) and I haven't had an issue since. That was at least 5yrs ago.