Design of a Decision Support Tool for Nutrient Credit Exchange Feasibility in Stormwater Regulatory Compliance

Transportation infrastructure projects require mitigation of water quantity and quality impacts under the Clean Water Act. The traditional approach for accomplishing this mitigation need has been to construct on-site Best Management Practices (BMPs), typically in the form of stormwater detention basins, or increasing through Low Impact Development (LID) tools to collect, store, and treat runoff from roads and bridges. These BMP and LID approaches have the same ultimate goal of onsite reduction of runoff caused by increased impervious surface. Water Quality Trading (WQT) offers a different approach for mitigating the impacts of transportation infrastructure where the mitigation needs are addressed offsite, potentially miles away, rather than onsite. WQT is just beginning to be explored and has not yet been widely adopted by departments of transportation (DOTs). While the concept of markets and trading of pollution credits is not new, it has been primarily applied for atmospheric rather than water pollutants. Recent legislation in Virginia allows the Virginia Department of Transportation (VDOT) to use WQT as a means for offsetting the impact of transportation infrastructure projects on water quality and quantity. Given this, there are important questions that must be addressed as to the sustainability of WQT compared to onsite treatment options. Sustainability is often considered as three pillars: economic, environmental, and societal. Current work at the University of Virginia (UVA) is exploring the economic aspects of WQT vs. on-site BMP construction, but there has been insufficient work to understand the environmental and social impacts of WQT. One of the key environmental impacts of WQT, distinguishing it from other pollutant trading applications, is the need to track the location of loadings and load reductions along river networks. Therefore, the goal of this study will be to create a Geographic Information System (GIS)-based approach for locating BMPs and WQT banks both within the context of existing transportation infrastructure but also within the context of key water and environmental resources. The GIS-based framework could be implemented in collaboration with the VDOT Information Technology Division (ITD). ITD maintains extensive GIS resources for VDOT including both data and tools that are accessed by the public and across VDOT. The expected benefits of this work are the ability to geolocate and track estimated loadings from transportation infrastructure to water bodies and explicitly track important upstream/downstream relationships along pollutant sources and nutrient credit banks (pollutant reductions). Using such a framework, it will be possible to better understand the net environmental impact of the decision to either use on-site or off-site approaches to mitigate water quality impacts.


  • English


  • Status: Completed
  • Contract Numbers:


  • Sponsor Organizations:

    Virginia Center for Transportation Innovation and Research

    530 Edgemont Road
    Charlottesville, VA  United States  22903
  • Project Managers:

    Parkany, Emily

  • Performing Organizations:

    University of Virginia, Charlottesville

    Charlottesville, VA  United States 
  • Principal Investigators:

    Goodall, Jonathan

  • Start Date: 20141001
  • Expected Completion Date: 0
  • Actual Completion Date: 20160531
  • Source Data: RiP Project 37263

Subject/Index Terms

Filing Info

  • Accession Number: 01539892
  • Record Type: Research project
  • Source Agency: Mid-Atlantic Transportation Sustainability Center
  • Contract Numbers: DTRT13-G-UTC33
  • Files: UTC, RiP
  • Created Date: Oct 7 2014 1:00AM