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ACKNOWLEDGMENT This work was sponsored by the American Association of State Highway and Transportation Officials (AASHTO), in cooperation with the Federal Highway Administration, and was conducted in the National Cooperative Highway Research Program (NCHRP), which is administered by the Transportation Research Board (TRB) of the National Academies. COPYRIGHT INFORMATION Authors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who own the copyright to any previously published or copyrighted material used herein. Cooperative Research Programs (CRP) grants permission to reproduce material in this publication for classroom and not-for-profit purposes. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, FAA, FHWA, FRA, FTA, Transit Development Corporation, or AOC endorsement of a particular product, method, or practice. It is expected that those reproducing the material in this document for educational and not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or reproduced material. For other uses of the material, request permission from CRP. DISCLAIMER The opinions and conclusions expressed or implied in this report are those of the researchers who performed the research. They are not necessarily those of the Transportation Research Board, the National Research Council, or the program sponsors. The information contained in this document was taken directly from the submission of the author(s). This material has not been edited by TRB.
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T A B L E O F C O N T E N T S SUMMARY ...................................................................................................................... 1 1. BACKGROUND .......................................................................................................... 3 References for More Information ............................................................................................................. 4 2. RESEARCH APPROACH ........................................................................................... 5 Task 1: Characterize the Urban Highway Environment Relative to Runoff Volume Reduction ................................................................................................................................ 5 Subtask 1.1: Summarize the Regulatory Context .................................................................................... 6 Subtask 1.2: Characterize Urban Highway Project Attributes, Physical Setting, and Key Constraints ... 6 Subtask 1.3: Identify Key Factors and Opportunities in Design and Application of Stormwater Volume Reduction ................................................................................................................................................. 7 References to Final Work Products ......................................................................................................... 8 Task 2: Develop Potential Volume Reduction Approaches ................................................. 8 Subtask 2.1: Literature Review and Data Compilation ............................................................................ 8 Subtask 2.2: Develop a Preliminary Menu of Volume Reduction Approaches and Evaluation Methods9 References to Final Work Products ......................................................................................................... 9 Task 3: Evaluate Volume Reduction Approaches ................................................................ 9 Subtask 3.1: Develop Evaluation and Selection Criteria; Develop Selection and Feasibility Matrices ... 9 Subtask 3.2: Summarize Feasibility-related Research Gaps and Identify Focused Analysis Topics .. 11 Subtask 3.3: Develop Selection and Feasibility Matrices ...................................................................... 11 Subtask 3.4: Develop Performance Evaluation Tool ............................................................................ 11 References to Final Work Products ....................................................................................................... 11 Task 4: Conduct Focused Technical Analyses................................................................... 11 Subtask 4.1: Infiltration Testing and Factors of Safety in Support of the Selection and Design of Volume Reduction Approaches ............................................................................................................. 12 Subtask 4.2: Potential Impacts of Highway Stormwater Infiltration on Water Balance and Groundwater Quality in Roadway Environments ......................................................................................................... 12 Subtask 4.3: Geotechnical Considerations in the Incorporation of Stormwater Infiltration Features in Urban Highway Design .......................................................................................................................... 12 Subtask 4.4: Review of Applicability of Permeable Pavement in Urban Highway Environments ......... 12 References to Final Work Products ....................................................................................................... 13 Task 5: Develop Guidance for Implementing Volume Reduction Approaches ................ 13 Subtask 5.1: Compile Guidance and Develop Step-by-Step Approach and Recommended Use ........ 13 Subtask 5.2: Introduce Watershed Scale Approaches .......................................................................... 13 Subtask 5.3: Develop Approaches for Enhancing Feasibility of Volume Reduction Approaches ......... 13 Subtask 5.4: âTest Driveâ the Guidance and Volume Performance Tool .............................................. 14 References to Final Work Products ....................................................................................................... 16
3. FINDINGS AND APPLICATIONS ............................................................................. 19 Summary of Findings ............................................................................................................................. 19 Intended Applications ............................................................................................................................. 25 4. CONCLUSIONS AND SUGGESTED RESEARCH ................................................... 27 Conclusions ........................................................................................................................................... 27 Suggested Research ............................................................................................................................. 27 ANNEX A: VOLUME PERFORMANCE TOOLâTECHNICAL DOCUMENTATION ... A-I APPENDICES C through F, NCHRP Report 802: Volume Reduction of Highway Runoff in Urban Areas: Guidance Manual ................................................ B-i Appendix C: Infiltration Testing and Factors of Safety in Support of the Selection and Design of Volume Reduction Approaches (White Paper #1) ................................................................................. C-i Appendix D: Potential Impacts of Highway Stormwater Infiltration of Water Balance and Groundwater Quality in Roadway Environments (White Paper #2)....................................................... D-i Appendix E: Geotechincal Considerations in the Incorporation of Stormwater Infiltration Features in Urban Highway Design (White Paper #3) .............................................................................................. E-i Appendix F: Review of Applicability of Pereable Pavement in Urban Highway Environments (White Paper #4) .................................................................................................................................... F-i ii
