A French drain is the generic term often used to describe a drainage system installed at the base of the foundation wall.  Though a French drain can be installed outside, that often requires large excavations including the removal of driveways, patios and landscaping which can be very costly.  Also, piping installed outside can be damaged due to the large overlying dirt loads.  For these reasons, the interior French drain has become increasing more popular due to its tremendous success at resolving basement water problems and is the focus of this article.