Permeable pavements are a cost-effective solution to managing stormwater when replacing failed roadways. In the last ten years, the City of Tacoma has constructed approximately 30 blocks of permeable pavement and five acres of permeable parking lot. The City of Puyallup has completed numerous porous pavement projects, including paths, local roads, alleys and two arterial roads. Those projects have shown that while technology is advancing rapidly, the lack of industry standards was slowing progress in adopting porous pavements as the preferred solution. This session’s speakers were key participants in the Permeable Pavement Specifications Task Force that created General Specifications for porous pavements for the APWA Washington Chapter. This work is continuing to advance the practice of porous pavements to include looking at different mix designs including fibers, recycled asphalt shingles and stiffer binders, which promise to address the longstanding issue of rut resistance with porous asphalt. Results from testing of these mix designs from an Ecology funded project in Tacoma will be presented, as well as promising information water quality treatment and cost effectiveness.

Learning Objectives:

1. Utilize APWA Washington Chapter’s General Specifications for porous and pervious pavements.

2. Recommend improvements to porous asphalt mix designs to improve rut resistance utilizing fibers, recycled asphalt shingles or higher-grade binder.

3. Explain the benefits of porous pavements to your clients and co-workers, including the cost and water quality benefits provided by their installation.

Contributor/Source

Jessica Knickerbocker P.E.;Mark Palmer P.E., LEED AP

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