Two nights ago we had quite a bit of rain/snow fall and in the evening my wife heard what sounded like dripping water coming from the air ducts. (These ducts are in the concrete slab). I pulled the couch back and sure enough I saw a water up to the edge of the bottom of the metal flashing. Through some other research and phone calls we had a camera inspection company come out to day and scope all the ducts. We found that they were in pretty healthy shape with no mold and only a few rust spots. There was definitely water in the plenum and the dirt/mud residue was throughout the ducts. It was recommended that a sump pump installed near the plenum would resolve the issue, but I am curious if that just fixes the symptoms of the water leaking in? Should we invest in proper french drainage-- having the ducts coated-- or just take them overhead?? Thanks in advance.