We have lived in the house for about 5 years. I would notice a few moist spots on the walls and floors after a heavy rain. But now the floor is always damp in the same two spots. One leading to the drain in the floor. Next to that is the little hole with the stones. I'm assuming that is the "french drain". There is another line of moister leading to it. Is it normal to always have a damp floor with this kind of drain? Do they need to cleaned? Help.