The International Information Center for Geotechnical Engineers

Prefabricated Vertical Drains


Suitable Soils

It is commonly assumed that wick drains should be used in all soils that compress very slowly under natural drainage condition due to low soil permeability and relatively great distance between natural drainage boundaries. However, PVD are not versatile for all soil types and geological conditions. The drains can be implemented in soils that are moderately to highly compressible under static loading. Applicable soils include:

  • Inorganic silts and clays of low to moderate sensitivity
  • Organic layers
  • Decomposed peat
  • Clayey and silty sands
  • Dredge spoils
  • Varved cohesive deposits

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