Alvin Sacks is a construction consultant whose work often involves water problems. Over the years, he has seen many cures that addressed the symptom but totally ignored the cause. In Sacks's experience, this was one of the stranger and more creative cures for a wet basement. The house was a 20-year-old split level. One half of the building was on a slab on grade. A large air trunk line ran under the slab from the furnace in the adjoining basement. According to the owners, the problem started years ago with water running from inside and around the trunk line into the basement during rainy periods. The owners finally called