Rewrite of the AASHTO Drainage Manual

The objective of this research is to produce a new, up to date AHWRM informed by the 2014 ADM and the results of NCHRP Project 20-07(417) that provides state DOTs and local transportation agencies with design policy and guidance and the technical background required to support them. The new AHWRM shall be in the format of modules that enables faster implementation and future updates to incorporate future research findings, emerging issues and technologies, and new design responsibilities. Further, the new manual shall incorporate any material from the HDG that is identified as appropriate for inclusion. The manual shall be a primary reference for policy, design criteria, design procedures, and emerging technologies for the state DOTs and local agencies. It shall further provide a broader perspective than that found in the state DOTs’ manuals and deeper technical resources. The research shall explore multiple formats for the written text focused on enhancing the readability, comprehension, and ease of use and revision of the text.


  • English


  • Status: Active
  • Funding: $600000
  • Contract Numbers:

    Project 24-50

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

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

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Harrigan, Edward

  • Performing Organizations:

    Ayres Associates, Incorporated

  • Principal Investigators:

    Schall, James

  • Start Date: 20210809
  • Expected Completion Date: 20240809
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01739664
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 24-50
  • Files: TRB, RIP
  • Created Date: May 21 2020 10:14AM