French drains is a term used to describe drain lines used underground to receive surface water and move it to a more desireable location or out to the street. The pipe used is usually black plastic, corgated, flexible pipe that comes in 10' sections or a roll of 100'. It can be solid or slotted depending on the type of situation the drain is solving. Examples are if the lawn is holding water in a certain area, i.e. between your home and the neighbor's, we would install slotted French Drain pipe all along through the wet area so that anywhere along the spain of the drain where water wants to sit, it will enter the drainpipe and flow to where the drain goes, either to a ditch, the street, or a catch basin. If the drain passes through a bed area, solid French Drain pipe would be used so no dirt, mulch, or plant roots enter into the drain.