10.5 Geosynthetics for Drainage Applications

Among the products used in drainage applications are:
Table 3-12: Geosynthetics for Drainage
Material
Application
Geotextile
  • Transmission of moisture to pavement edge.
  • Trench lining to prevent intrusion of fine soil into drainage layers and structure.
  • Wrapping drainage pipe to prevent siltation of the drain.
  • Wrapping aggregate to provide confinement and prevent fine soil intrusion.
  • Silt fencing.
  • Erosion control logs.
Geomembrane
  • Vertical moisture barrier for pavement edges.
  • Creation of retention/detention ponds.
  • Encapsulation provision for confining and waterproofing material in the roadbed.
Geowebs
  • Composite material that provides both a drainage structure and separation with a geotextile.
Vertical Drains
  • Composite material that transmits water from the roadway, through a geotextile and down to a drainage structure.