Air Vents Pouring Water!

One problem is build up of leaves, mud and other debri on the cowl floor, which simply will not drain. It raises the cowl "floor" so that as water pools up, it runs over the top of the vent sleeves. Also of course, the cowl floor can rust through. You may know the drains are in the ends of the cowl, and they are not very big. "If I had the fenders off" I would be tempted to make them larger