Implementing a National Catalog of Subgrade Soil-Water Characteristic Curve (SWCC) Default Inputs for Use with the MEPDG

The objective of NCHRP Project 9-23A was to create a national database of pedologic soil families that contains the soil properties for subgrade materials needed as input to the MEPDG. The database focuses upon the parameters describing the soil-water characteristic curves (SWCC), which are key parameters in the implementation of MEPDG Level 1 environmental analysis, but also includes measured soil index properties needed by the EICM in all three hierarchical levels of pavement design. A summary of the project final report is available as Research Results Digest 347, "A National Database of Subgrade Soil-Water Characteristic Curves and Selected Soil Properties for Use With the MEPDG." The entire project final report including appendixes is available as NCHRP Web-Only Document 153.


  • English


  • Status: Completed
  • Funding: $59500
  • Contract Numbers:

    Project 09-23A

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials (AASHTO)

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Performing Organizations:

    Arizona State University, Tempe

    Tempe, AZ  United States 
  • Principal Investigators:

    Zapata, Claudia

  • Start Date: 20080724
  • Expected Completion Date: 20100531
  • Actual Completion Date: 20100531
  • Source Data: RiP Project 39804

Subject/Index Terms

Filing Info

  • Accession Number: 01566526
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 09-23A
  • Files: TRB, RiP
  • Created Date: Jun 17 2015 1:00AM