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French drain. A French drain or weeping tile (also blind drain, rubble drain, rock drain, drain tile, perimeter drain, land drain, French ditch, sub-surface drain, sub-soil drain or agricultural drain) is a trench filled with gravel or rock or containing a perforated pipe that redirects surface water and groundwater away from an area.
To make a French Drain work (yard drain) the trench should be deep enough to allow water to flood from the bootom of the trench up through the gravel into the pipe.The way the system works is: 1  a gravel base is laid under the pipe. 2  the holes in the perforated pipe point DOWN.o make a French Drain work (yard drain) the trench should be deep enough to allow water to flood from the bootom of the trench up through the gravel into the pipe. The way the system works is: