This paper summarizes the work session on subdrainage held at the 1973 Federal Highway Administration workshop on Water in Pavements in Denver, Colorado. Participants discussed the state-of-the-practice and their experience in the drainage and interception of groundwater for the design of pavements. A representative of the Office of Federal Highway Projects, U.S. Federal Highway Administration, reported on some of their practices. They have been using standard drawings for subdrains, with the standard generally consisting of a 6-in. (15-cm) or 8-in. (20-cm) perforated pipe placed in a trench and backfilled with granular material. They are shifting to design on a case-by-case basis. Research work on the design of underdrains has pointed toward the use of slotted pipe. Interceptor drains are normally placed under the shoulder or ditch section, rather than close to the edge of the pavement, because the purpose is to intercept groundwater, rather than surface percolation. Participants concluded that drainage systems to intercept groundwater are normally independent of the drainage systems used to handle water coming from the pavement surface. A representative of the Federal Aviation Administration reported on the problems of subdrainage under large airport runway slabs. It was agreed that there is a need for more engineering geology and subsurface exploration before groundwater problems are considered in design and construction. Another common problem was the lack of coordination between the designer and the construction engineer.

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

    Federal Highway Administration

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


  • English

Media Info

  • Pagination: p. 370-372

Subject/Index Terms

Filing Info

  • Accession Number: 00792291
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: May 8 2000 12:00AM