State DOTs are increasingly subject to Total Maximum Daily Load (TMDL) requirements for water quality improvement that are implemented through National Pollutant Discharge Elimination System (NPDES) permits.
As a result, state DOTs may incur significant costs to construct, operate, maintain, and monitor performance of best management practices and other stormwater treatment facilities that treat stormwater from sources outside the right-of-way, as well as stormwater from roadway sources.
TRB’s National Cooperative Highway Research Program (NCHRP) Research Report 918: Approaches for Determining and Complying with TMDL Requirements Related to Roadway Stormwater Runoff describes how to evaluate TMDLs and develop a plan to comply with the requirements of a TMDL. The methods provide a robust approach to determining the pollutants of concern and how to assess the contribution of the roadway while understanding other important factors that affect overall pollutant loads, including adjacent land uses and watershed conditions and characteristics.
A set of presentation slides summarizing the project that developed the report is available for download.
Table of Contents
|Chapter 1 - Introduction||3-6|
|Chapter 2 - State DOT TMDL Negotiation and Engagement||7-11|
|Chapter 3 - Significance of Stormwater Pollutants||12-42|
|Chapter 4 - Compliance Strategies Approach||43-69|
|Chapter 5 - Evaluating Watersheds and Best Management Practices||70-76|
|Chapter 6 - Best Management Practice Pollutant Removal Performance||77-91|
|Chapter 7 - Best Management Practice Cost and Effectiveness Analysis||92-99|
|Chapter 8 - Effectiveness of Innovative Solutions||100-110|
|Abbreviations and Acronyms||122-124|
|Appendix A - DOTs Included in TMDLs||125-127|
|Appendix B - Sample Unit Area Load Results from SELDM Model||128-130|
|Appendix C - Reach Prioritization Example||131-138|
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