Winter 2017-18

 KNOWLEDGE base InterlockDesign.org ® esign interloc 13 WINTER 2018 L ed by Dr. John Harvey, Director of the UC Pavement Research Center at UC Davis, experts convened last Novem- ber to identify barriers to permeable pavements and how to overcome them. The conference began with presentations by industry representatives, plus federal, state, and municipal officials, academics, and consultants. While most participants came from areas within storm water management, others came with a pavements background. While presentations proceeded, the audience wrote questions for discussion. This resulted in 76 questions covering the topics listed below. The second day of the conference consisted of breakout groups generating answers to these questions. Here are the salient questions and answers. All responses are found at www.ucprc.ucdavis.edu/permPvmt . Costing & cost decision support —Unlike approaches for traditional pavements, life cycle costs analyses must include off- site benefits. Continued initial and maintenance costs must be monitored and collected. Material & pavement performance —More pilot projects, specifically street and road shoulder demonstration projects are needed. Pervious concrete and porous asphalt durability needs to be improved. Education & training —Besides in-service training for design professionals and decision-makers, there needs to be university curriculum on permeable pavements. Can design professional training also include certification? Civil engineers need to learn how to design permeable pavements in saturated subgrades as this isn’t taught in PROVIDES INSIGHT INTO DIVERGENT AGENCY GOALS AND NEEDED INSTITUTIONAL CHANGES Permeable Pavement Road Map Conference university curriculum. Hence, the reluctance to use permeable pavements. This is a core institutional concern. Communication among industries and users —Can there be an information clearinghouse? Project-level design concerns —There is a need for more design details, standard methods for soil investigations, and structural design tables developed from full-scale load testing include hybrid designs. Tested proof of structural performance is needed to raise user confidence. This will promote full-width street applications and convince more municipalities to adopt permeable pavements into their catalogs of standard specs and drawings. Watershed & flood control design concerns —Permeable pavements have the potential to reduce flooding and contribute to a more resilient infrastructure. What research, modeling, and case studies are needed to demonstrate this? What are the economic benefits? Cities such as Atlanta and New Orleans are using permeable pavement to control flooding, i.e., the road system is also the runoff storage and conveyance system. Designing for additional benefits & impacts —Permeable pavements have many benefits beyond stormwater management. They need to be quantified and some need to be measured through environmental life cycle assessment analyses. Construction standards & issues —Continued contractor training and construction QC/QA are essential, as well as refinement of specifications, and adoption into state and local specifications. Over 50 persons recently gathered in Davis, California, to remove barriers to wider use of permeable pavements.