Answer
What is a French drain?
A gravel-filled trench with a perforated pipe that carries water away from a wet spot.
In short
A French drain is a gravel-filled trench, usually with a perforated pipe in it, that intercepts and carries water away from where it is a problem to where it can soak away or discharge. It is a common, effective fix for a wet area or to protect a wall or patio.
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