Everyone knows that water must be kept out of basements and away from slabs. The theory of how to do this is well developed and simple. The practice, however, is not always so simple. As with most other building problems, there is a logical process to solving foundation water problems, and that process can be broken down into a few steps. These are illustrated by the following case study. House on a Hill In southern New Hampshire, we have a house under construction with a basement located on a broad terrace near the top of a large hill. The hill is noted for its ledge and its springs. The side of the site on the downhill (east side