Stormwater Infiltration in the Highway Environment: Guidance Manual
This report from earlier in 2020 is relevant to the latest issue of
TR News (
#328, on stormwater management).
The infiltration approach to stormwater management involves the design, construction, and
operation of engineered systems that infiltrate stormwater runoff into soils. These systems, referred
to as “infiltration best management practices (BMPs),” are intended to reduce the volume of stormwater runoff and associated
pollutants that discharge to stormwater systems and receiving waters via surface runoff.
The TRB National Cooperative Highway Research Program's
NCHRP Research Report 922: Stormwater Infiltration in the Highway Environment: Guidance Manual supports evaluation, selection, siting, design, and
construction of infiltration BMPs in the highway environment.
It is also intended to identify limitations on the use of infiltration and determine the need
for alternative non-infiltration-based stormwater management approaches.
Additional resources for the guide include:
A Power Point presentation summarizing the project
Appendix A: Infiltration BMP Fact Sheets
Appendix B: Infiltration Estimation Method Selection and Interpretation Guide
Appendix C: Roadside BMP Groundwater Mounding Assessment Guide and User Tool (Excel-based tool)
Appendix D: Guide for Assessing Potential Impacts of Highway Stormwater Infiltration on
Water Balance and Groundwater Quality in Roadway Environments (Excel-based tool)
Appendix E: Guide to Geotechnical Considerations Associated with Stormwater Infiltration
Features in Urban Highway Design
Appendix F: BMP Clogging Risk Assessment Tool (Excel-based tool)
Appendix G: Whole Lifecycle Cost and Performance Example
Appendix H: Example Construction-Phase Checklists for Inspector and Contractor Training
Appendix I: Summary of Infiltration Issues Related to Cold and Arid Climates
Appendix J: BMP Case Study Reports
This Summary Last Modified On: 9/17/2020