As the U.S. Environmental Protection Agency (U.S. EPA) continues to press for development of numeric nutrient criteria for state waters and incorporation of nutrient Total Maximum Daily Loads (TMDLs) into National Pollutant Discharge Elimination System (NPDES) permits, it has become increasingly important for NPDES permit holders to have effective, flexible, and low-cost implementation alternatives for nutrient management. This project addressed the growing need for a better understanding of nutrient cycling, fate and transport, and removal mechanisms to improve the control of nutrient sources and runoff concentrations from DOT facilities. The final report provides DOTs with an understanding of highway nutrient contributions and how they can be cost-effectively managed, if required, via best management practices (BMPs).
The agency’s final report is available at: http://onlinepubs.trb.org/onlinepubs/nchrp/docs/NCHRP25-25(85)_FR.pdf, along with a summarizing PowerPoint presentation at: http://onlinepubs.trb.org/onlinepubs/nchrp/docs/NCHRP25-25(85)_Final_Presentation.pptx.
This study was requested by the American Association of State Highway and Transportation Officials (AASHTO) and conducted as part of the National Cooperative Highway Research Program (NCHRP) Project 25-25. The final deliverables are NOT official publications of the National Cooperative Highway Research Program, Transportation Research Board, National Research Council, or the National Academies.