My home is on a concrete slab and the heating/cooling ducts are in the slab. Whenever there's a long, hard rain or a thawing of a lot of snow, I get water in my ducts. Before I bought the house (6 years ago), a contractor installed drainage pipe around the perimeter of the house about 6' away, leading away to the front yard near the street. I have also installed raised garden beds, a patio slanted away from the house (of which these 2 things did help somewhat), but when the weather is severe I still get the water. I've even had to remove the water from the ducts by dipping it out with a cup into a bucket because the water was too high for the furnace to do it's work. I don't know what to do. I'd greatly appreciate any helpful suggestions.