Volume Reduction of Highway Runoff in Urban Areas: Final Report and NCHRP Report 802 Appendices C through F (2015) / Chapter Skim
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Pages 28-30
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C H A P T E R 4 Conclusions and Suggested Research Conclusions DOTs are facing increasing requirements to reduce the volume of stormwater runoff from highways that is immediately or ultimately discharged to surface waters via overland flow or a constructed above or below ground conveyance. Implementing stormwater VRAs in highly constrained urban environment presents a number of challenges and constraints due to the limited space available in the right-of-way for infiltration, evapotranspiration, on-site use, or flow control.
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case, it is not clear to the research team that a regulatory preference for volume control is necessary in comparison to an alternative approach that provides the necessary removal and control of pollutants. In addition, regulations that have included a hierarchy of considering volume reduction as the top priority also typically specify a design storm (e.g., the 85th percentile, 24-hour storm event)
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Full scale experience with permeable shoulders and travel lanes – To date, there is relatively limited full scale experience with permeable pavement technologies in the highway environment. As such, significant uncertainty remains about the longevity, durability, and maintenance needs of permeable pavements in this environment.
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