Synthesis of Information Related to Highway Practices. Topic 55-07. Complying with Stormwater Retrofit Permit Requirements Through Third-Party Partnerships

Due to the lack of stormwater control facilities on many existing highways, some state departments of transportation (DOTs) are required to retrofit the stormwater system with improved flow control and treatment facilities to comply with regulatory requirements. The main drivers include National Pollutant Discharge Elimination System (NPDES) stormwater permits, state water quality/stormwater regulations, Endangered Species Act (ESA) consultation, and/or Total Maximum Daily Load (TMDL) prescribed actions. As stormwater runoff quality and quantity are increasingly being addressed, state DOTs are seeking information on effective watershed-based strategies. To comply with regulatory requirements in a more cost-effective manner, some DOTs have partnered with third parties, or are considering doing so. However, due to a lack of guidelines, state DOTs are devising diverse mechanisms to implement these partnerships. The objective of this synthesis project is to document practices used by state DOTs regarding stormwater retrofit partnerships with third parties.


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  • Status: Active
  • Funding: $55000
  • Contract Numbers:

    Project 20-05, Topic 55-07

  • Sponsor Organizations:

    National Cooperative Highway Research Program (NCHRP) Synthesis

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC    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:

    Nasri, Arefeh

  • Performing Organizations:

    ,   Germany 

    Dyer Mountain Ltd

    Lakewood, Colorado   
  • Principal Investigators:

    Harelson, Stephen

  • Start Date: 20240205
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01884614
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-05, Topic 55-07
  • Files: TRB, RIP
  • Created Date: Jun 5 2023 4:13PM