This paper summarizes the work session on flexible pavements held at the 1973 Federal Highway Administration workshop on Water in Pavements in Des Moines, Iowa. Of the 10 states represented in the session, none of them design and install subsurface drainage systems in their flexible pavements as a matter of routine. Rather, subsurface drainage systems are designed and installed to handle specific problems that are identified during the soil survey or during construction. Materials used as filter aggregate range from pit-run sand to a graded aggregate. Concrete sand has wide use as a filter material. Several states are using plastic filter cloth in conjunction with some type of filter aggregate on a trial basis. Most of the states have experienced problems resulting from outlets freezing or being broken during maintenance operations. The criteria used by the various states for the design of flexible pavement overlays ranges from experience and the funds available to the use of deflection measurement devices, such as the Benkelman Beam. The session closed with a short discussion on the use of pavement skid testing units.

  • Supplemental Notes:
    • This paper was presented at a 1973 workshop on Water in Pavements sponsored by the Federal Highway Administration, held in Des Moines, Iowa.
  • Corporate Authors:

    Federal Highway Administration

    Office of Research, Development, Engineering and Highway Operations, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Stanfield, J A
  • Conference:
  • Publication Date: 1973


  • English

Media Info

  • Pagination: p. 265-266

Subject/Index Terms

Filing Info

  • Accession Number: 00792268
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: May 6 2000 12:00AM