A French drain is a trench that is dug higher at one end and lined with filter cloth. Next, a perforated PVC pipe is placed in the trench and covered with gravel. This type of drain works very well for its first few years, but tends to be less effective after 5 years due to clogging.
The best French drains use superior drainage materials (never gravel!) that resist clogging and will provide more years of effective service.
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