Term of the Road Dictionary

French drain

  • Language : PIARC Road Dictionary / English
  • Theme : Roads Drainage and Sewerage
  • Definition : Drain formed of a trench typically 1 m deep containing a porous, perforated or open-jointed pipe laid on, and backfilled with, a porous material. Note: the drain is used either for both surface water and subgrade drainage (''French drain'', typically 0.6 m wide) or for subgrade drainage only (''filter drain'', typically 0.15 m wide).
  • Synonyms : filter drain

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