Synthesis: Rip-Rap for Scour Countermeasures

The use of rip-rap to protect against scour is very common both at the design stage and as a repair option. When the rip-rap fails, new rip-rap must be placed and additional cost is incurred. Making sure that the rip-rap will perform as planned will save money by avoiding sustained maintenance or replacement. Rip-rap is used extensively to protect abutments from scour and to repair bridge piers that are experiencing excessive scour depth. In many instances, the rip-rap has not performed correctly. At the pier, this can be due to the soil below the rip-rap continuing to scour away.On the abutment slope, this can be due to the rip-rap failing the slope because of the added weight from the rip-rap. There is a need to develop practical guidelines to ensure that the rip-rap performs as intended. The research team will conduct a synthesis of national research and in-use structures within the US and internationally to determine whether a filter is necessary or not between the rip-rap and the native soil. If a filter is found necessary, researchers will develop a specification for the filter. The synthesis study will address the stability of slopes with rip-rap covers and the research team will develop recommendations to ensure the stability of the slope after rip-rap placement.


  • English


  • Status: Completed
  • Funding: $65,000
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Managing Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Pridgen, Shelley

  • Performing Organizations:

    Texas Transportation Institute

    Texas A&M University System
    3135 TAMU
    College Station, TX  United States  77843-3135
  • Principal Investigators:

    Briaud, Jean-Louis

  • Start Date: 20200901
  • Expected Completion Date: 20210831
  • Actual Completion Date: 0

Subject/Index Terms

  • TRT Terms: Riprap; Scour
  • Subject Areas: Bridges and other structures; Hydraulics and Hydrology;

Filing Info

  • Accession Number: 01766376
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-7091
  • Files: RIP, STATEDOT
  • Created Date: Mar 1 2021 5:39PM