A French drain is a ditch in sloped ground, inset with a perforated pipe under a layer of gravel. From the surface, a French drain looks like a rock drainage ditch, and when done well, like a nice ...

A “drain tile” refers to a system of perforated pipes laid along the foundation, inside or outside. Also known as French drains or perimeter drains, these system channels water away from the home.

The most common in Washington are known as drywells. An injection well is designed and built: Deeper than the largest surface dimension. To contain an assemblage of perforated pipe. As an improved ...