PICP Maintenance Presented Virtually at National Watershed Conference

May 5, 2020

Originally planned for an Austin, Texas meeting, the National Watershed & Stormwater Conference hosted by the Center for Watershed Protection moved their April 14-16 event online in response to national and local restrictions. ICPI Technical Director David R. Smith provided a 25-minute presentation entitled, “Best Practices for Maintenance of Permeable Interlocking Concrete (PICP)” based on national guidelines in ASCE 68-18. His presentation is available here. ICPI member Kevin Earley, Chair of the ICPI Foundation Program Committee presented on “Maintaining Permeable Pavers for Long-Term Infiltration.”

Besides reviewing inspection practices, Mr. Smith’s presentation gave special emphasis on the latest technologies for removing sediment from the joints, thereby restoring the surface infiltration of highly clogged PICP that never received regular surface cleaning. His presentation included surface infiltration testing as well as before-and-after infiltration rate data from various types of cleaning equipment to demonstrate their effectiveness.

Mr. Earley’s presentation summarized two reports recently delivered by the University of Toronto on PICP cleaning equipment effectiveness and on winter deicer use. Mr. Earley provided data on equipment performance for routine cleaning as well as for restoring the surface infiltration of highly clogged PICP. The deicer study helped quantify what many PICP users have likely experienced for years, i.e. a reduction in deicer use. The University of Toronto study demonstrated that deicer use can be reduced as much as 50% compared to that applied to asphalt pavement. This is good news for many northern municipalities whose lakes are being damaged by excessive deicer use on impervious pavements, thereby shrinking or closing local businesses that support fishing, boating, and other water-based recreational activities. Both reports involved a two-year, US$160,000 research project jointly funded by the ICPI Foundation for Education & Research and the National Sciences and Engineering Research Council of Canada.