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Permeable Shoulders With Stone Reservoirs

The objective of this study is to evaluate the suitability of using permeable pavement for roadway shoulder applications. Permeable pavement systems are designed to minimize environmental impacts, stormwater runoff, and flooding and to treat or remove pollutants by allowing stormwater to infiltrate through the pavement in a manner similar to pre-development hydrologic conditions. State Departments of Transportation (DOTs) and other municipal organizations have expressed interest in permeable shoulders to assist in the overall management of stormwater. Water from the surface of the roadway would flow into the permeable shoulder into a stone reservoir to temporarily store and treat runoff before infiltration into the roadway subgrade soils and/or discharge to other stormwater conveyance and treatment systems. The primary benefits of permeable pavements are to reduce stormwater runoff volume, reduce stormwater runoff peak flows, reduce surface ponding, reduce stormwater pollutant load, decrease downstream erosion and increase groundwater recharge. Careful consideration of design features and construction techniques are necessary to ensure their success. Key design features include a careful assessment of the permeable pavement site and its surrounding land use to ensure that the pavement surface does not become contaminated with sand/dust or vegetative matter. A rational assessment of the traffic to which the pavement will be exposed will permit the designer to ensure that the pavement has sufficient structural capacity for its design life. A hydrological design taking into account rain water landing on the pavement and water shed from the highway lanes can be accommodated into the permeable pavement and then properly treated for water quality improvements and permitted to exit the pavement either through infiltration into the subgrade or controlled through underdrains. Construction processes and techniques should consider the protection of the permeable pavement from contaminants during construction and ensure that the pavement is able to accommodate both vehicle loading and water infiltration and exfiltration in accordance with the pavement design. Finally, with all pavements, maintenance practices should include occasional vacuum sweeping to ensure the longevity of the permeable surface with repairs completed to address any localized deficiencies.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 125p

Subject/Index Terms

Filing Info

  • Accession Number: 01497098
  • Record Type: Publication
  • Report/Paper Numbers: NCHRP 25-25 Task 82
  • Files: TRIS
  • Created Date: Oct 29 2013 10:39AM