This report documents the development of geosynthetic unsaturated drainage system, also known as a geocomposite capillary barrier drain (GCBD). Much development of procedures and techniques were required to test GCBD components under unsaturated conditions. GCBD drain systems are tested in 3m long test device, subjected to various infiltration rates and slopes. The tests proved that commercially available geosynthetics when combined in a GCBD configuration, could readily drain water laterally while the adjacent soil remains unsaturated. The GCBD system is expected to be effective when placed between a base course and sub-grade by preventing the sub-grade from wetting up at all. Other advantages of the GCBD system include (1) the base course will drain under unsaturated conditions and thus will never saturate, (2) the GCBD can serve as an effective capillary barrier for either downward or upward moving water, and (3) the GCBD system will serve other functions such as serving as a separator layer.

  • Corporate Authors:

    University of New Mexico, Albuquerque

    Department of Civil Engineering
    Albuquerque, NM  United States  87131-0001

    New Mexico State Highway and Transportation Department

    State Highway Department Building, P.O. Box 1149
    Sante Fe, NM  United States  87504-1149
  • Authors:
    • Stormont, J C
  • Publication Date: 1998-12


  • English

Media Info

  • Features: Appendices; Figures; References;
  • Pagination: 34 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00766672
  • Record Type: Publication
  • Report/Paper Numbers: 3-49421,, CE-JCS-98-02
  • Contract Numbers: CO3537
  • Created Date: Jul 7 1999 12:00AM