1.   And that is a French drain, a perforated pipe installed under the cellar slab inside the foundation, all the way around, leading to the sump.

2.   A French drain is relatively simple, consisting of a large plastic perforated pipe put in a ditch and covered with gravel.

3.   A perforated pipe is installed under the floor, along the interior perimeter of the foundation.

4.   Cover the drain tiles with gravel, then connect the perforated pipe to a sump dug into the floor in which a sump pump has been installed.

5.   From the distribution box, Keeton said, the effluent is then evenly distributed into the drain field through perforated plastic pipes buried underground.

6.   Perforated pipe in the trench is covered with gravel and a layer of concrete.

7.   The leaching field generally consists of perforated pipe resting on gravel-filled beds that allow water to drain into the underlying soil.

8.   The perforated pipe intercepts the water under the floor before it floods the floor, and delivers it to the sump and the pump.

9.   The underground river necessitated a system of perforated pipes under the concrete floor and around the footings, coupled with a fiberglass wicking system surrounding the foundation wall.